Showing posts with label Pawn-majority. Show all posts
Showing posts with label Pawn-majority. Show all posts

Friday, 3 July 2026

Fascinating Ending

HERE is a a fascinating and instructive endgame position from Carl Portman's Never Mind The Grandmasters column in Chess magazine.
Black to make his 33rd move in Portman (1888 ECF) - Tayeb Kazemi (1791 ECF), Leamington (Warwickshire) League 2026
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Pawn endings with rival majorities are tricky, no matter how equal the engines reckon the position is (completely equal, according to Stockfish18 and Dragon1).
So how does one go about gaining winning chances, or, at least, setting the opponent problems?
The answer, I believe, is to try to create a passed pawn that will divert the enemy king, leaving your own king free to attack weak enemy pawns, and thus create another, this-time-winning, passer.
Here is an example from a 1991 rapid game at London's Barbican.
Black has just captured a knight on e6 in Spanton (151 BCF) - Martin Cutmore (152 BCF)
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I played 26.Kf3, as advancing the king is rarely wrong in such positions, although the engines marginally prefer 26.g4!?
After 26...h5, I took the chance to also advance my backward pawn with 27.e4, and following 27...dxe4+ 28.Kxe4, we have a position with rival pawn-majorities.
The game is completely equal, according to Stockfish18 and Dragon1
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28...f5+?
This natural-looking move not only gains space, but comes with a check, and yet after it Black is lost. The engines reckon several moves maintain the balance, including 28...g6, 28...a5 and 28...b5.
The problem with the text is that after 29.Kf4, Black is obliged to defend the kingside as 29...Kd5 30.Kxf5 Kxd4 is hopeless, eg 31.Kg6 Ke3 32.Kxg7 Kf4 33.Kh6 Kg4 34.g3, when Black's king will eventually have to move, allowing Kxh5.
My opponent played 29...Kf6 (29...g6 runs into the same trouble as in the game after 30.Kg5 Kf7 31.c4), but 30.c4 g6 31.d5 cxd5 32.cxd5 created a diverting passed pawn.
The game finished 32...a5 33.b3 b5 34.a4 b4 35.g3 Ke7 36.Ke5 1-0.
Returning to Portman-Kazemi, what would you play in the diagram position?
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The game saw 33...h5?, which, probably to both players' surprise, loses.
CP states that, after the move, "the engines goes up to '+7' for White." I do not know which engine he is talking about, but for a long time Stockfish18 puts White's advantage at a little over 3.00, while Dragon1 gives White only the upper hand. However, after allowing them more time than I usually would, Stockfish18's evaluation rises to just over +4.00, while Dragon1 agrees White is winning, but puts the advantage at a little under +2.00.
Even so, whatever the precise number, there seems little doubt White is winning, whereas moves such as 33...g4!? (CP's suggestion) and 33...a5 keep the game level.
I might have been inclined to play 33...Kd5, and if, as in the game, 34.c4, a sample continuation runs 34...bxc4+ 35.bxc4+ Kd6, when neither side is able to safely create a diverting passer.
In the game, White met Black's faulty 33rd move by gaining space with 34.c4!, which the engines agree is the strongest continuation by some distance.
There followed 34...a6 35.a4 Kd6 36.a5 Ke6.
How should White proceed?
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37.Ke3
Also winning is 27.h4 - the idea will become apparent as the game progresses.
However, simply creating a passed pawn is NOT the way to go. Indeed, 37.cxb5?? turns a win into a loss after 37...cxb5 as, far from diverting Black's king, the sequence allows the king to advance to the d5 square, eg 38.Ke3 Kd5 39.Kd3 f4 40.gxf4 gxf4, when it is Black who has created a diverting passer, a possible continuation being 41.b4 f3!? 42.Ke3 f2 43.Kxf2 Kxd4 etc, or 41.h4 b4 42.Ke2 Kxd4 etc.
37...Kd6 38.h4!?
This could also have been played in answer to 37...Kf6.
38...bxc4 39.bxc4 gxh4
Or 39...g4 40.Kf4 Ke6 41.Kg5 etc.
40.gxh4 Ke6
Black has created a passed pawn, but rather than diverting White's king from a crucial part of the board, the sequence has created weak squares that invite the king to advance
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41.Kf4 Kf6 42.d5!?
But this does create a passer that diverts.
42...cxd5
Or 42...c5 43.d6!? Ke6 44.d7 Kxd7 45.Kxf5 etc.
43.cxd5 Ke7
As CP points out, 43...Kg6 loses to 44.Ke5.
44.Kxf5 (1-0, 53 moves).
So why was 33...h5? weak? The answer is it eventually let White create kingside weaknesses in Black's position with 38.h4!?
Could Black have prevented this? Well, he could have prevented the h4 thrust, eg with 34...g4, but that does White's job for him by immediately creating black kingside weaknesses, a likely continuation being 35.Ke3 a6 36.Kf4 Kf6 37.cxb5 cxb5 (37...axb5 38.a4) 38.d5, when the diverting passer wins.
As is often the case, a 'simple' pawn ending has proved to be anything but simple.

Thursday, 17 November 2022

Brno Game Five

Spanton (1771) - Per Green (1918)
Veresov
1.d4 Nf6 2.Nc3 d5 3.Bg5 c5!?
Most popular in ChessBase's 2022 Mega database are 3...Bf5, 3...e6, which allows a transposition to the French Defence, and especially 3...Nbd7.
4.e3
The mainline in Mega22 runs 4.Bxf6!? gxf6 5.e3 Nc6 6.Qh5!? e6 7.0-0-0!? with an equal position, according to Stockfish15 and Komodo13.02.
4...cxd4 5.Qxd4!?
Trying to capitalise on White's lead in development. The engines prefer 5.Bxf6 or 5.exd4.
5...Nc6 6.Bb5 Bd7 7.Bxc6
This seems better than 7.Qh4, as played in Vinh Bui (2488) - Péter Prohászka (2495), Budapest GM Tournament 2009, which continued 7...e6 8.Nf3 Be7 9.0-0 h6 with a slight edge for Black, according to the engines (0-1, 24 moves).
7...Bxc6 8.Nf3 Qa5?!
This may be a mistake. The engines prefer 8...Ne4 or 8...e6.
9.b4!? Qd8 10.0-0?!
This is probably too slow. The engines give 10.Bxf6!? gxf6 11.b5 Bd7, and now 12.0-0 or 12.Nxd5 Bxb5 13.c4, but not 12.Qxd5?! as 12...Rc8!? is difficult to meet.
10...e6
The engines' 10...Ne4!? seems stronger.
11.Ne5 h6 12.Bxf6 gxf6 13.Nxc6 bxc6 14.Rfd1 Bd6 15.Rab1 Rg8!?
The engines prefer 15...Be5 or 15...Qc7.
16.Qh4!?
The engines prefer 16.Ne2.
16...Rg6
The engines give 16...f5!?, the point being 17.Qxh6? Be5 with ...Rh8 to come is terrible for White, while 17.Qxd8+ gets the queens off, which must favour Black as the white king is much the safer of the two monarchs.
17.e4 Be7 18.exd5 cxd5 19.Qd4 h5 20.h3!?
Preventing ...Rg4 and more-or-less eliminating the danger of a back-rank mate.
20...Qb8 21.Ne2 Bd6?
The engines reckon Black is better after 21...Qe5, again pursuing the policy of getting queens off, whereas the text lets White advance the backward c pawn.
22.c4
How should Black respond?
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22...Rg5?
I expected 22...Be5, when one line given by the engines runs 23.Qc5 dxc4 24.Qc6+ Kf8 25.Rbc1, claiming at least the upper hand for White.
23.Qxf6 Rf5 24.Qh8+ Bf8!?
Keeping queens on probably gives the best practical chance, although the engines prefer 24...Ke7 or 24...Kd7.
25.Nd4
Probably even stronger is 25.Ng3 Qe5 26.Qh7.
25...Rg5
How should White proceed?
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26.c5?!
Almost certainly stronger are 26.cxd5 and 26.Nf3 followed by cxd5.
26...Qf4 27.Nb5?
Best, according to the engines, is 27.Rb3, intending Re3 or Rf3.
Black to play and draw
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27...Kd7?
Black could have bailed out with 27...Qf3 28.g3 Rxg3+ 29.fxg3 Qxg3+, after which the white king cannot escape checks.
28.Qc3 Bg7 29.c6+ Ke8 30.Qe3
Not 30.Qc5? Be5.
30...Qxe3 31.fxe3 Be5 32.Rdc1 a6?!
The engines prefer 32...Rg3, but give White at least a slight edge.
33.Nd4 Bc7
The bishop is a good blockader, but White's 3-1 queenside pawn-majority is potent.
34.a4 Ke7 35.Rb2?!
Defending g2 from a doubling of the black rooks on the g file and from the black queen's rook coming to a2, but it seems there was no need, the engines giving 35.b5 axb5 36.Nxb5!, eg 36...Kd8 37.Nxc7 Kxc7 38.Rb7+ Kc8 39.Rxf7 Rxa4 40.Rb1 with a large advantage.
35...e5 36.Nf3 Rg3 37.Kh1 Kd6 38.b5 axb5 39.axb5 Bb6
What should White play?
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40.Nh4
This is strong, but even stronger is 40.c7! Bxc7 41.b6 Bd8 42.b7 Rb8 43.Rc8 Bc7 (I saw this far, but missed the winning continuation) 44.Rxb8 Bxb8 45.Rc2.Bc7 46.Kh2 Rg6 (other moves are no better) 47.Nxe5! Kxe5 48.Rxc7 Rb6 49.Rxf7, leaving White two pawns up in a rook-and-pawn ending.
40...Rgg8
Both 40...Rxe3?? and 40...Bxg3?? are met by 41.Nf5+
41.Rd1
Almost certainly better is 41.e4!?, eg 41...dxe4 42.c7! Kd7 43.Rd2+ Kc8 44.Nf5, or 41....d4 42.Rf2! Rgf8 43.Rf6+ Kc7 44.Rf5.
41...Ke6 42.Rb3?!
Probably better are the engines' 42.Rbd2 and 42.Rf1.
42...Ra4
The engines reckon Black has equalised
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43.Nf3 Ra2 44.Rd2 Ra1+?!
Exchanging a pair of rooks seems to simplify Black's task.
45.Kh2 f6 46.Rc2 Rc8 47.Kg3 Ra4 48.Ne1?!
Probably better is 48.h4!?
48...f5
Starting to roll Black's central pawn-majority, but the engines prefer 48...h4+!? followed by ...e4.
49.Nd3 Kd6
Black can probably restore material equality with 49...Bxe3!?
50.Nb4 Rg8+?!
The rook should probably be left opposite the c pawn.
51.Kf3?
White has at least a slight edge after 51.Kh2, according to the engines.
51...Ra5?
Winning, according to the engines, is 51...e4+, eg 52.Kf4 Ra1 53.Rbb2 Bc7, or 52.Kf2 d4! 53.Rd2 f4.
52.Na6
The engines give 52.c7!? Bxc7 53.Rbc3 e4+ 54.Kf2 Bd8 55.Rc6+ Kd7 56.Nxd5 with at least a slight edge for White.
52...Rc8?
The game is completely equal after 52...Ra1. according to the engines.
White to play and win
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53.c7! Bxc7
Black's best chance seems to be 53...Kd7!?, but 54.Nb8 Ke8 55.Rc6 e4+ 56.Kf4! Bxc7+ 57.Kf5 Rxb8 58.Rxc7 Rxab5 59.Rxb5 Rxb5 60.Ke6 is a winning rook-and-pawn ending, according to the engines.
54.Rc6+ Kd7 55.Nc5+ Ke8?
This makes it easier than it need be, although after 55...Ke7 56.Na6 e4+ 57.Ke2 White is also winning.
56.b6 e4+ 57.Ke2 Ra2+ 58.Kd1 Rca8?! 59.bxc7 1-0

Saturday, 21 November 2020

Lockdown Correspondence Chess

AM playing on board three for England in semi-final group four of the Carlos Flores Gutiérrez Team Tournament at the International Correspondence Chess Federation.
My first four games to finish were drawn. The fifth to finish can be seen at https://beauchess.blogspot.com/2020/10/morphing-french-xvi.html. This is the sixth game to finish.
Spanton (England - 2260) - Serge Maurer (Canada - IM2221)
Maróczy Bind
1.e4 c5 2.Nf3 e6 3.c4!?
The sixth-most popular move in ChessBase's 2020 Mega database, but it has been played by Magnus Carlsen.
3...Nc6 4.d4 cxd4 5.Nxd4 Nf6 6.Nc3 d6!?
By far the most common choice in Mega20 is 6...Bb4.
7.Be2 Be7 8.0-0 0-0 9.Be3 Bd7 10.Rc1 Nxd4 11.Qxd4 Bc6 12.Rfd1 Qb8 13.b4
An alternative plan, successfully played in Petr Velička (2449) - Jan Votava (2511), Czech Championship (Lázně Bohdaneč) 1999, starts with 13.f4. That game continued 13...a6 14.a4 a5!? 15.Bf3 Nd7 16.Qd3 Rd8 17.b3 b6 18.Nb5, when the analysis engines Stockfish12 and Komodo11.01  reckon Black could have equalised with the natural-looking 18...Nc5. Instead the game saw 18...e5?! 19.f5, after which Black had no easy way of breaking the bind (1-0, 42 moves).
13...b6 14.Qd3!?
Komodo11.01 prefers the known move 14.f4, while Stockfish12 likes 14.f3 which, as with the text, does not appear in Mega20. The idea of 14.Qd3!? is to vacate d4 for the white dark-square bishop, which can put pressure on the black kingside as well as, indirectly, on the d6 pawn.
14...Rd8 15.Bd4 a6 16.a4 Nd7 17.Qg3 Bf6 18.Bxf6 Nxf6 19.Qe3
Black has swopped his inactive bishop for its active white counterpart. That gives him the better surviving bishop, but he is sensitive on the dark squares.
19...Nd7 20.Qd4 Nf6
I am not sure what SM hoped to achieve by his knight-dance, but note that Black was not ready for the thematic pawn-break ...d5, eg 19...d5? 20.cxd5 exd5 21.e5 Ne8 22.b5 axb5 23.axb5 Bb7 24.Qxb6.
21.f4 h6 22.Qe3 Nd7 23.Qd4 Nf6 24.h4
I was not interested in a draw.
24...e5!?
Trying to give himself some space before White opens lines on the kingside with g4 etc.
25.fxe5 dxe5 26.Qxd8+ Qxd8 27.Rxd8+ Rxd8 28.Nd5
There is no longer any question of a mating attack on the black king, but now White has the much more mobile pawn-majority.
28...Bxa4
Not 28...Nxe4?? 29.Ne7+ and 30.Nxc6.
29.Nxb6 Bc6 30.Nd5 Kf8 31.Bd3 Rb8 32.Ra1 Bb7?!
White gets two connected passed pawns after 32...Bxd5 33.exd5, but this might be the better option.
33.Ra4
White's bishop makes a poor impression, but it is doing a useful job on d3 defending e4 and c4. Meanwhile the white knight is very strong, and Black does not want to capture it because White gets connected passed pawns after the recapture exd5.
33...Ke8 34.Kf2
Both kings enter play, but White's has a more important role to play.
34...Kd8
34...Kd7 is not really an improvement as Black effectively has to wait on White as there is no counterplay in the position.
35.Ke3 Kd7 36.Kd2 Rd8 37.Kc3 Re8 38.Ra1 Rg8 39.Rf1 Ke6 40.Kb3 Bc6 41.Ra1 Bb7
The bishop is forced back as 41...Ra8?? would be a gross blunder thanks to 42.Nc7+. But now the white king activates further.
42.Ka4 Kd7 43.Ka5 Rd8 44.Bc2 Rb8 45.Nxf6+?!
Probably not the best. I somehow thought we had a position without the move 44.Bc2, in which case Nxf6+ probably is the best move. Fortunately for me, White's advantage is so large - three white pawns on the kingside are basically holding up four black ones - that the outcome should not be affected.
45...gxf6 46.Rf1 Ke7 47.c5 Rg8 48.Kb6 Bc8 49.Bd3

Position after 49.Bd3 - who stands better and by how much?
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I am sure this is a position a lot of players would look at and be unsure who has the advantage, or at least be unsure as to how big that advantage is. Engines, however, have no such difficulty - they reckon White is winning, and winning easily. Stockfish12, for example, has White the equivalent of more than 6.5 pawns ahead, while Komodo11.01 has White more than 4.5 pawns ahead. Give the engines longer, and the evaluations rise rather than fall.
The game finished:
49...f5!? 50.exf5 Rg4 51.f6+ Ke8 52.Kc7 Rd4 53.Kxc8 Rxd3 54.c6 1-0
I have been unable to pinpoint exactly where Black lost this game. It seems his game gradually went downhill without any glaring mistakes.
One thing I have noticed with the Maróczy Bind is that, at my level at least, it is easier for White to keep control of the position in correspondence chess rather than over the board.
I suspect this may be because the bind takes time to set up and maintain, which gives Black active piece-play that humans find harder to handle than engines do.
Conversely, Black needs a plan against the bind rather than just relying on tactics, and failure to come up with a suitable plan will be punished more efficiently in correspondence chess.

Wednesday, 3 June 2020

More Lockdown Chess

I AM playing on board three for Lean Thinkers in division two of the 6th British Webserver Correspondence Championship, where the format is six games as a single-round-robin.
My first two games to finish were draws, and I won the next on the black side of a Maróczy Bind (https://beauchess.blogspot.com/2020/05/lockdown-chess.html).
Here is the fourth game to finish.
Spanton (2256) - John G Cooper (2136)
Sicilian Bb5(+)
1.e4 c5 2.Nf3 Nc6 3.Bb5 Nf6
More popular are 3...g6, 3...e6 and 3...d6 but there are 3,700 examples of the text in ChessBase's 2020 Mega database. Richard Palliser in The Bb5 Sicilian (Everyman Chess 2005) called it "the fashionable line."
4.Qe2
More popular, and scoring a higher percentage in Mega20, are 4.Nc3, 4.e5 and 4.Bxc6. The text is not liked by the analysis engines Stockfish11 and Komodo11.01 but has some interesting points.
4...g6 5.c3 Bg7 6.d4 cxd4 7.cxd4 d5
A standard Black response when White gets pawns abreast in the centre.
8.e5 Ne4 9.0-0 0-0 10.Nc3 Bf5
The obvious alternative is 10...Nxc3 11.bxc3, after which Roland Ott (2225) - Evgeny Sveshnikov (2510), World Students Team Championship (Caracas, Venezuela) 1976, continued 11...Na5 12.Bg5 h6 13.Bd2 Bd7 14.Bd3 with an equal game, according to the engines (½–½, 29 moves).
11.Bxc6!?
Giving up the bishop-pair without being provoked by, for example, ...a6, may seem a little strange, especially as White is left with a bad bishop (an old rule of thumb has it that when you have a bad bishop you should not give up your good one), but the move has been played by David Bronstein and Levon Aronian.
11...bxc6 12.Nh4
This was Aronian's choice last year at the Fide World Cup in a draw against Quang Liem Le. Bronstein preferred 12.Na4 in the 1975 Soviet Championship against Vitaly Tseshkovsky, a game that also ended in a draw.
12...Nxc3
Le played 12...e6.
13.bxc3 Bc8
Black has the bishop-pair, and White has a bad bishop. But in the middlegame, I believe I am right in saying, what counts is not so much whether a bishop is good or bad but whether it is active or inactive. Here White is able to activate his one bishop on the a3-f8 diagonal. Meanwhile White has more space in the centre, which should probably also eventually mean more space on the kingside.
14.Ba3 Qa5!?
This is the engines' choice, narrowly over 14...Re8, but White's rather obvious reply makes the move seem odd to me.
15.Bb4 Qc7 16.Bc5 a5 17.Rfe1 f6!?
Black's dark-square bishop, although technically good (Black's d pawn is on a light square), is biting on granite, so the text is an attempt to give it a more-active role and at the same time undermine White's centre. Consistent with Black's previous move is 17...Ba6, but then the engines reckon 18.Qc2, possibly with f4-f5 to come, is good for White.
18.Qe3 fxe5 19.dxe5
We now have a position with rival pawn-majorities, which usually favours the bishops. But here Black's queenside majority is blockaded while White's kingside majority is free to advance.
19...Rb8 20.Nf3 Rb2
This is Komodo11.01's choice. Stockfish11 also likes it at first but comes to prefer 20...Rf5.
21.h3
Partly luft for the king but also keeping the light-square bishop out of g4.
21...Rb5!?
A point behind this is revealed in the note to Black's next move.
22.a4 Rb2
Black may have intended 22...Bh6!? After 23.Qxh6 Rxc5 Black has given up the bishop-pair but broken the blockade on his queenside. The engines reckon White has the upper hand after 24.Re3, and it has to be said Black's king looks unsafe. However I was also considering sacrificing the queen with 23.axb5!? Bxe3 24.b6, which I may well not have had the courage to do over the board, but one can look more deeply at the ramifications when playing correspondence chess.
23.Rab1 Rxb1 24.Rxb1 Bf5 25.Re1 Qd7
The engines give 25...h5 26.Nd4 Kh7 but with a large advantage for White. It seems Black, without making any obviously bad moves, has slowly slipped into a very difficult position.
26.Nd4
Black's queenside is now firmly blockaded, and Black apparently has no counterplay against White's coming kingside expansion.
26...Qb7 27.g4 Bc8 28.f4 Bh6
Komodo11.01 at first reckons this move equalises, but soon comes to agree with Stockfish11's assessment of a large edge for White.
29.Rf1 Rf7 30.e6 Rf8 31.Kg2 1-0
Resignation might seem premature, and I am sure JC would have carried on in an over-the-board game, but the engines agree White is roughly the equivalent of a piece up.

Sunday, 3 May 2020

Fundamentals (part nine)

Spanton (151) - Martin Cutmore (152)
Barbican (London) Rapidplay 1989
Black has just captured on e6
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Black's king is more centralised, and White has a backward e pawn, but neither factor seems very important - the position is dead-equal, according to analysis engines Stockfish10 and Komodo10.
26.Kf3 h5
Komodo10 reckons 26...f5 27.Kf4 Kf6 is a tiny bit better for Black, which is why the engine preferred 26.g4. Stockfish10 rates the position after 27...Kf6 as still dead-equal.
27.e4 dxe4+ 28.Kxe4
We now have rival pawn majorities, which makes it much easier to go wrong, as Black does immediately.
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28...f5+?
A useful general rule-of-thumb is that you should first advance the unopposed pawn of a pawn majority. But here that rule-of-thumb is wrong as, after the text, White's h pawn is holding up two black pawns. And since the white g pawn is holding up the f pawn, Black's pawn majority can no longer make a passed pawn with normal play.
Indeed, after ...
29.Kf4
... Black is obliged to reply ...
29...Kf6
(29...g6 30.Kf5 Kf7 is no improvement) ... and White is free to create a winning passer on the queenside.
30.c4 g6 31.d5 cxd5 32.cxd5 a5 33.b3 b5 34.a4 b4 35.g3
Having this reserve tempo is nice, but it is not necessary as 35.d6 also wins.
35...Ke7 36.Ke5 1-0

Friday, 24 January 2020

Lasker's Spanish Inquisition (conclusions)

IN his 10 games with 5.d4 lines in the Spanish Exchange, Lasker scored +6=3-1, which is 75%.
If you remove the three games from simultaneous exhibitions, at least two of which were against master-strength opposition, his record is even more impressive: +5=1-1, or 78.6%.
The five wins were against Tarrasch (1908 world championship), Janowski twice (second Paris match), Capablanca (St Petersburg 1914) and Marshall (New York 1924).
The only blemishes on Lasker's record in these important games were a draw against Showalter (Cambridge Springs 1904) and a loss to Steinitz (1894 world championship).
Playing 4.Bxc6 was not Lasker's only weapon against the Spanish. He chose 4.Ba4 three times as often, but scored a much lower percentage - 63% with 4.Ba4, 82% with 4.Bxc6 (he was especially deadly with the follow-up 5.Nc3), according to ChessBase's 2020 Mega database.
The following traits can be seen in Lasker's 5.d4 Spanish Exchanges:
1. The white king usually stays in the centre, ready to support the white kingside pawns (but White castles long if circumstances dictate). White should not fear losing castling rights after a major-piece exchange on d1 - the king shuffles sideways to the e file.
2. With pawns on e4 and f4, the anti-positional thrust f5 can be surprisingly effective. If Black responds with ...f6, or has played the move earlier, the square e6 can become an outpost for a white knight. The Black f pawn can also be attacked by White's g pawn.
3. Piece exchanges generally favour White, even though a less-cluttered board usually enhances the power of a bishop-pair. This is because exchanges bring an endgame closer, which greatly favours White if the pawn-majorities are still as they are from the opening, ie White has a 4-3 kingside majority that can easily yield a passed pawn, while Black's 4-3 queenside majority can rarely do the same.
4. If both sides advance their pawn-chains and the pawns become fixed, this almost certainly favours the player with a knight rather than a bishop.
Here is one of my games, from last year's Pimlico summer congress, that illustrates some of the above points.
Spanton (171) - Gergely Kiss (207)
1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6 dxc6 5.d4 exd4 6.Qxd4 Qxd4 7.Nxd4 Bc5!? 8.Be3 Nf6!?
Black's set-up is aggressive and has been tried by strong players, including Capablanca, but was condemned by Alekhine, who said it endangered the bishop-pair.
9.f3 0-0 10.Nf5!?
Alekhine's recommendation. Lasker played 10.Nd2 in a simul: https://beauchess.blogspot.com/2020/01/laskers-spanish-inquisition-part-four.html
10...Bb4
Three previous opponents of mine played the too-accommodating 10...Bxe3?!
11.c3 Bxf5 12.cxb4 Rfe8 13.Kf2 Bg6
As Alekhine warned, Black's bishop-pair is gone, but White's queenside pawn-formation is damaged. Stockfish10 and Komodo10 reckon White has the upper hand.
14.Nc3 Nd7 15.Bf4 Ne5 16.Rhd1
I cannot recall why I did not play 16.Nxe5. I guess I must have feared Black's bishop combining with his rooks in a way that White's knight cannot work with the white rooks.
16...Kf8 17.h3
Threatening to trap the bishop with 18.Bxe5 Rxe5 19.f4 etc.
17...f6 18.Bxe5
Now I exchange minors, and get a rook to the seventh into the bargain.
18....Rxe5 19.Rd7 Re7 20.Rad1 Ke8 21.Rxe7+ Kxe7 22.Ke3 Bf7 23.f4 Bc4 24.Rd4 b5 25.Rd2 a5 26.bxa5
How should Black proceed?
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26...Rxa5
Black seems to have excellent drawing chances with the engines' 26...b4!? Their main line runs 27.Na4 Bxa2 28.Nc5 Rxa5 29.Rc2, when White is a pawn down but Black's queenside is weak. The engines continue 29...Rb5 30.b3 Bb1 31.Rc1 Kd6! 32.Kd4 Rxc5 33.Rxc5 Bxe4 34.Kc4 Bxg2 35.Kxb4, when Black has two pawns for the exchange, and the reduced material makes a draw very likely.
27.a3
Better is 27.Kd4!, but I missed that 27...Bxa2?? loses to 28.b4.
27...Ra8 28.g3 h5!?
We have a typical Spanish Exchange ending of white knight and rook versus black bishop and rook. Usually White has much-the-better pawn-majority. Here that is not quite as pronounced as usual, but even so it will be difficult for Black to create a passed pawn. The text becomes Komodo10's top choice, but in my view is double-edged - it gains space, but puts another pawn on the same-coloured squares as the black bishop, which weakens Black's dark squares.
29.h4 g6!? 30.Kf3
The engines prefer the Lasker-like thrust 30.f5.
30...Rh8 31.Nd1 Rd8?
Definitely a mistake - removal of the rooks makes it much easier for the white knight and king to manoeuvre.
32.Rxd8 Kxd8 33.b4
Fixing the c pawns.
33...Ke7 34.Ke3 Kd6
KG offered a draw.
(The rest of the notes are from my original post about this game.)
Normally a bishop outplays a knight in an ending with rival pawn-majorities. But here White can stop Black activating his queenside majority, after which it is just a question of whether White can win or only draw with his kingside majority. Bearing in mind that Black's bishop is fairly bad - four out of six black pawns are on light squares - Black's practical chances of holding this ending are very low.
35.Kd4 Be2 36.Nc3 Bf3 37.a4 bxa4 38.Nxa4 Bd1 39.Nc5 Bf3 40.Nb7+
40.e5+ is probably a quicker way to win, but there is no harm in probing with the knight as Black cannot prevent White coming back to the e5+ idea.
40...Ke6 41.Nd8+ Kd7 42.Nf7 Ke6 43.Nd8+
I got cold feet about 43.Nh8 because of 43...f5, when 44.Nxg6 seems to be the only way to keep winning chances. White then has to be certain he is winning after both 44...fxe4?! and 44...Bxe4. I was not sure, but I was fairly confident that returning the knight to the queenside would win.
43...Kd7 44.Nb7 Ke6 45.Nc5+ Kd6 46.Nd3 Ke6 47.Ke3 Bg2?
This speeds defeat, as does 47...Bg4? 48.Nf2. Black had to play 47...Bd1 or 47...Bh1, but in each case White wins slowly but comfortably, eg 47...Bd1 48.Nc5+ Kd6 49.Na6 Ba4 50.Kd4 Bc2 51.e5+ fxe5 52.fxe5+ Kd7 (52...Ke6 53.Nxc7 Kf5 54.e6 Kf6 55.Kc5) 53.Ke3 Bf5 54.Kf4 Bc2 55.Nb8+.
48.f5+ gxf5
If 48...Kf7, then 49.Nf4.
49.Nf4+ 1-0

Wednesday, 22 January 2020

Lasker's Spanish Inquisition (part nine) - THE Game

NOW we come to one of the most famous games in chess history, about which more nonsense has been written than probably any other encounter.
Lasker - Capablanca, St Petersburg Finals Round 7, is famous despite being very much short of the fireworks that mark out most celebrated games.
As the story is usually told, Capablanca was running away with the tournament and only needed to draw against Lasker to virtually guarantee first place.

Lasker, as usual, began quite slowly and, with just four rounds to go, he was trailing a full point behind Capablanca, whom he was desperately trying to catch. His last chance to fight for tournament victory was to beat the leader - Garry Kasparov, ChessBase's Mega database.

The young Cuban, who was confidently leading the tournament, needed only not to lose with Black against the current world champion in order to claim overall tournament victory - Vladimir Tukmakov in Modern Chess Preparation, New In Chess 2012.

Capablanca wanted a draw, because he was Black and because a half point would virtually clinch first prize, Réti said - Andrew Soltis in Why Lasker Matters, Batsford 2005.

What Réti actually wrote was: In Capablanca's remarkably cautious playing in this game it is easy to see that, owing to his favourable standing in the tournament, he has determined to play only for a draw - Masters Of The Chessboard, Dover 1976 reprint of the first English edition of 1932.

There is much more along these lines on the internet, where people seem prone to confuse Capablanca's standing at the start of the finals, where he was 1.5pts ahead of Lasker from the preliminary rounds, with his position when the two met in the finals with four rounds to go.
The truth is that when Lasker played Capablanca in this famous game, they were joint-first on 11pts.
However, it is fair to say Capablanca was still favoured by many to win the tournament.
The reason has to do with the unusual format at St Petersburg.
It began in the preliminaries with 11 players, the favourites being generally acknowledged as the world champion (Lasker), the fast-rising Capablanca, and Akiba Rubinstein, arguably the strongest player never to have played for the world title.
Five players would qualify for the finals, but they were not to include Rubinstein. Instead they consisted of Capablanca (unbeaten on 8pts), Lasker and Tarrasch (6.5pts), and Alekhine and Marshall (6pts).
Whether these famous five were dubbed grandmasters by Tsar Nicholas II is extremely doubtful, but at any event they would compete in a double-round-robin, bringing forward their scores from the preliminaries.
Because there were five players in the finals, one in every round was given a no-point bye.
By the time they reached round seven, where Lasker had the white pieces against Capablanca, the latter had already had his two byes, while the world champion was due one in the following round.
This meant that after their game, Capablanca had three more games (White against Tarrasch, Black against Marshall and White against Alekhine). Lasker had just two more games (Black against Tarrasch and White against Marshall).
I am sure I will not be spoiling it for anyone by stating that Lasker beat Capablanca. This gave him 12pts to the Cuban's 11pts.
The next day, in round eight, while Lasker sat it out, Capablanca went down to Tarrasch, remaining a point behind Lasker, and now having played an equal number of games.
But the drama was not over. In round nine, Lasker was held to a draw by Tarrasch, while Capablanca beat Marshall, setting up a dramatic last round.
Capablanca duly beat Alekhine to reach 13pts, but Lasker also despatched Marshall, winning the tournament with 13.5pts.
Here is the game about which so much has been written.
Lasker - Capablanca
1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6
Kasparov: "(!) A very surprising choice. The Exchange Variation of the Ruy Lopez was a dangerous weapon in Lasker's hands. But nobody in the audience and amongst the participants believed that this quiet opening would work against Capablanca, whose excellent technique was already widely recognised. With the charming self-confidence of youth, José Raoul unfortunately shared this misconception and did not recognise Lasker's real intentions."
Soltis: "Tarrasch said that when the game was adjourned for a meal break, he asked Lasker why he chose 4.Bxc6. Lasker replied that he had studied Tarrasch's new idea in the Open Defence and couldn't find an improvement for White. Lasker feared that Capablanca would use the same opening. But this sounds like another Lasker smokescreen. Capablanca never played the Open Defence in his career, and Lasker often played the Exchange Variation without a special reason."
4...dxc6 5.d4 exd4 6.Qxd4 Qxd4 7.Nxd4
Kasparov: "Now even the queens are off the board. Is this the way to play for a win in the decisive game?"
Lasker in Lasker's Manual Of Chess (Dover 1960 reprint of the original 1947 David McKay Company edition): "Black must not refuse this simplification, otherwise he loses too much space."
7...Bd6
Capablanca in Chess Fundamentals (Bell 1973 reset reprint of original 1921 edition): "Black's idea is to castle on the kingside. His reason is that the king ought to remain on the weaker side to oppose later the advance of White's pawns."
Réti: "The bishop is very well-posted here. That is, if White succeeds in exchanging it, in order to deprive the second player of the weapon furnished by the two bishops, then, after the pawn recaptures on d6, Black's pawn-position will also be improved."
8.Nc3 Ne7 9.0-0
Reinfeld & Fine in Lasker's Greatest Games 1889-1914 (Dover 1965 reprint of the original 1935 The Black Knight Press edition entitled Dr. Lasker's Chess Career, Part I: 1889-1914): "Unusual but good: the king is to support the advance of the kingside pawns."
I played the more popular 9.Be3, and later castled queenside, in a win over a junior rated 1744/150 at Hastings 2019-20, but as I noted in part three of this series, Lasker generally kept his king on the kingside in 5.d4 lines of the Spanish Exchange, although often preferring long-castling if he had played 5.Nc3.
9...0-0
Reinfeld & Fine: "Also unusual, but this time less good. Black should castle queenside in order to guard his weak pawns."
Réti: "In a later game, Schlechter played at this point against [me] the much better move ...Bd7, combined with queenside castling [Vienna Trebitsch Memorial 1914, 0-1 39 moves]."
The text is the most-popular move, from a small sample, in ChessBase's Mega20, and was played four years ago by 2509-rated Nikita Petrov in a draw against Yuri Korsunsky (2411).
10.f4
Capablanca: "This move I considered weak at the time, and I do still. It leaves the e pawn weak, unless it advances to e5, and it also makes possible for Black to pin the knight by ...Bc5."
Reinfeld & Fine: "Having the majority of pawns on the kingside, Lasker immediately sets out to utilise this advantage."
10...Re8
Capablanca: "Best. It threatens ...Bc5, Be3 Nd5. It also prevents Be3 because of ...Nd5 or ...Nf5."
Reinfeld & Fine: "Superior to the text was 10...f5 11.e5 Bc5 12.Be3 Bxd4! 13.Bxd4 b6 [Korunsky - Petrov, EU-Cup Novi Sad 2016, saw 13...Rfd8 14.Bf2 Ng6, with Black later successfully blockading White's passer] 14.Rad1 c5 15.Be3 Be6, and in view of the bishops of opposite colour and Black's initiative on the queenside, the position is about even."
Soltis gives the text an exclamation mark, stating that it "threatens to seize an edge with 11...Bc5 12.Be3 Nd5!"
Réti: "A more vigorous move would be ...Bc5, which Lasker prevents with his following move, which is excellent."
Kasparov: "Later Dr Tarrasch suggested a better line: 10...f5 11.e5 Bc5 12.Be3 Bxd4 13.Bxd4 b6, and despite White's strong passed pawn, Black has enough defensive resources. So strong was the impression of Lasker's original plan that the commentators tried to improve Black's play at the earliest possible stage! But Capablanca was right in his assessment: Black had little to worry about."
For what it is worth, Stockfish10 and Komodo10 agree with Capablanca and Soltis.
11.Nb3 f6
Lasker (commenting generally on ...f6 in the Spanish Exchange rather than on this exact position): "The move ...f6, ordinarily weak becomes very effective after the exchange of the hostile king's bishop. This observation is due to Steinitz. Bernstein has applied it happily in recommending against 5.Nc3 the defence 5...f6 in this Exchange Variation."
Réti: "An absolutely unnecessary defensive move, for White's e5 would be of advantage only to Black, since he would have the points d5 and f5 free for his pieces."
Soltis: "Before this game, the move ...f6 was considered good for Black in the Exchange Variation, 'even necessary' said [Russian master Samuil] Vainshtein. After the game, annotators dismissed ...f6 as questionable because 'it makes [the move] f5 stronger'. We [have] got so much smarter over the years that when ...f6 is played, it's taken for granted that f5 will be strong."
Reinfeld & Fine: "Preventing e5 but weakening e6. Preferable was 11...Be6 and if 12.e5 [then] 12...Bb4 with good chances."
Capablanca: "Preparatory to ...b6, followed by ...c5 and ...Bb7 in conjunction with ...Ng6, which would put White in great difficulties to meet the combined attack against the two centre pawns."
White to make his famous 12th move
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12.f5!?
Kasparov awards this an exclamation mark, stating: "Under the classical rules of the Steinitz positional school this move has to be damned. White gets a weak pawn on e4, Black a stronghold on e5, with a devaluation of White's pawn-advantage on the kingside -- too many negative points for just one move. But Lasker's eagle eye had seen much further."
Capablanca: "It has been wrongly claimed that this wins the game, but I would like nothing better than to have such a position again. It required several mistakes on my part finally to obtain a lost position."
Tukmakov awards an exclamation mark, with the laconic note: "12.Be3 Nd5!"
Reinfeld & Fine also give an exclamation mark, stating: "A surprising and courageous move which gives White a definite advantage. The move creates a hole for Black's pieces at e5, but it helps White in three ways: 1) it fixes Black's f pawn, enabling White to undertake a kingside attack with g4-g5; 2) it contains Black's queen's bishop; 3) it will later enable White to plant a knight at e6. The fact that Lasker was able to carry out every one of these objectives, shows that Capablanca did not properly grasp the essentials of the position."
Soltis: "Tarrasch had ridiculed f5 when it occurred in a similar position … but Tarrasch's knee-jerk classicism had been proven wrong when Lasker won [against Salwe five years earlier at St Petersburg 1909] and the f5 idea had worked reasonably well in other previous games."
Réti: "A surprising move. On closer examination, however, it is perceived that … apparent disadvantages go hand in hand with less apparent but actually more important advantages."
12...b6
Kasparov: "12...Bd7 13.Bf4 Rad8 was recommended by stern post-mortem analysts. But obviously the bishop is better placed on b7, where it attacks the pawn on e4."
Reinfeld & Fine: "A wiser continuation was 12...Bd7 and if 13.Bf4 [then] 13...Bxf4 14.Rxf4 Rad8 15.Rd1 Bc8 and White will find it difficult to press home his advantage."
Soltis: "From this point on the annotators looked for a way to save Black's position - a remarkable admission of the strength of 12.f5."
Réti: "Because Capablanca hits on the unfortunate idea of withdrawing his queen's bishop from the defence of the point e6, that point becomes much weaker than e5 is for White. The simplest alternative is probably the development ...Bd7, combined with ...Rad8."
Tukmakov gives 12...Bd7 13.Bf4 Rad8 without comment.
13.Bf4 Bb7
Kasparov gives this move a question mark, commenting: "Now a serious mistake! In general Black should be happy to undouble his c-pawns, but here the pawn on d6 will become a permanent weakness."
Capablanca: "Played against my better judgment. The right move of course was 13...Bxf4."
Soltis also awards a question mark, saying Capablanca's suggestion has been "analysed well into a minor-piece ending."
Réti says Black was "absolutely forced to exchange."
14.Bxd6
Reinfeld & Fine: "Good: now Black has a new weakness at d6."
Soltis gives the move an exclamation mark, stating: "White makes the d pawn the board's only real target."
14...cxd6 15.Nd4
Capablanca: "It is a curious but true fact that I did not see this move when I played 13...Bb7."
15...Rad8
Capablanca: "The game is yet far from lost, as against the entry of the knight, Black can later on play ...c5, followed by ...d5."
Kasparov gives the move a question mark, stating: "Capablanca doesn't take White's plan seriously. The knight on e6 will be a bone in the throat. So 15...Bc8 was obligatory. Maybe the Cuban was too proud to recognise his mistake so soon."
Reinfeld & Fine also award a question mark: "After this he will never be able to drive White's knight from e6."
Soltis says White's advantage is not great after 15...Bc8 "but it is enough to play for a win."
16.Ne6 Rd7 17.Rad1
Capablanca: "I now was on the point of playing ...c5, to be followed by ...d5, which I thought would give me a draw, but suddenly I became ambitious and thought I could play 17...Nc8 and later on sacrifice the exchange for the knight at e6, winning a pawn for it, and leaving White's e pawn still weaker."
Soltis says White would be much better after 17...c5 18.Nd5 Bxd5 19.exd5 b5 20.g4! with a kingside attack.
Reinfeld & Fine say 17...c5 18.Bf2, followed by Rfd2, "would practically stalemate all of Black's pieces."
17...Nc8 18.Rf2 b5
Reinfeld & Fine: "In order to obtain some more room. But the move eventually leads to the opening of the a file, which can only result in White's favour because of his superior mobility. Black's best chance was to give up the exchange."
Unfortunately, the immediate ...Rxe6?, if this is what they meant, fails to the engines' 19.fxe6 Re7 20.e5!, when 20...dxe5? leads to mate after 21.Rd8+ while 20...fxe5 21.Rdf1 Re8 22.Ne4 is not much better, eg 22...d5 23.e7! Nxe7 24.Nd6. That leaves 20...Rxe6, which is met by 21.exd6 Nxd6 22.Rfd2 Nf7 23.Rd7 with a large advantage.
19.Rdf2 Rde7
The engines reckon 19...b4 gives more hope, but much prefer White after 20.Ne2.
20.b4
Reinfeld & Fine: "Stops ...c5 or ...b4."
20...Kf7 21.a3 Ba8
Capablanca: "Had I played ...Rxe6, fxe6 Rxe6, as I intended to do when I went back with the knight to c8, I doubt very much if White would have been able to win the game. At least it would have been extremely difficult."
Kasparov says Capablanca's line "would have given him the best fighting-chances."
Soltis says Black, after the exchange sacrifice, "can establish a semi-fortress, with his king at e7 and knight at c4." He suggest best play runs 23.Rd4 c5! 24.bxc5 dxc5 25.Rd7+ Re7 "followed by ...Nb6." He concludes: "Black is not losing." The engines continue 26.Rd8 Nb6, when Stockfish10 reckons 27.Nd5 Bxd5 28.exd5 Rd7 29.Rb8 Nc4 30.Rc8 is winning, but Komodo10 'only' gives White the upper hand.
22.Kf2 Ra7 23.g4
Réti: "We recognise once more the type of game in which the advantage of controlling more territory is turned to account."
23...h6 24.Rd3 a5 25.h4 axb4 26.axb4 Rae7
Capablanca: "Black, with a bad game, flounders around for a move. It would have been better to play ...Ra3 to keep the open file, and at the same time to threaten to come out with the knight at b6 and c4."
27.Kf3 Rg8 28.Kf4 g6 29.Rg3 g5+
Kasparov: "The last move to be criticised by the annotators. But it's too late for good advice."
30.Kf3 Nb6 31.hxg5 hxg5 32.Rh3!
Kasparov: "32.Rxd6 would have given Black some extra breathing time."
32...Rd7 33.Kg3 Ke8 34.Rdh1 Bb7 35.e5! dxe5 36.Ne4 Nd5 37.N6c5 Bc8
Or, for example, 37...Rdg7 38.Nxb7 Rxb7 39.Nd6+.
The game finished:
38.Nxd7 Bxd7 39.Rh7 Rf8 40.Ra1 Kd8 41.Ra8+ Bc8 42.Nc5 1-0

Tuesday, 21 January 2020

Know Your Endings

AN old rule has it that if all else fails against a much weaker opponent, swop off into an ending.
This rule applies at all levels.
Today is the double-round day in the Mariánské Lázně 50+ seniors.
This morning, in round four, I faced an Austrian.
Manfred Sonntagbauer (1431) - Spanton (1854)
London System
1.d4 d5 2.Nf3 e6 3.Bf4 Bd6 4.Bxd6
Much more popular, and scoring a much better percentage in ChessBase's 2020 Mega database, is 4.Bg3.
4...cxd6
And here the queen recapture is massively more popular.
5.e3 Nc6 6.Be2 e5!?
Arguably premature - Stockfish10 and Komodo10 do not like it - but this advance is one of the points of Black's fourth move.
7.dxe5
The engines give 7.c4, when Stockfish10 continues 7...dxc4 8.dxe5 Nxe5 9.Nc3 Nf6 10.Qd4 0-0 11.Nxe5 dxe5 12.Qxe5 Be6 13.0-0 with equality, although Komodo10 reckons White has a slight edge.
Komodo10 continues 7...Nf6 8.Nc3 Be6 9.cxd5 Nxd5 10.a3 Nxc3 11.bxc3 Bf5 12.Qb3 Qc7 13.0-0 with equality, although Stockfish10 prefers White.
Neither of these lines should be taken too seriously - there are plenty of alternatives along the way for both sides.
7...dxe5 8.0-0 e4?
This is definitely premature. I intended following up with ...Qg5, threatening ...Bh3. It was only after White played …
9.Nd4
 ...that I saw 9...Qg5 could be met by 10.f4 If I had looked further, I would have seen that 10...exf3 forces 11.Rxf3 with an unclear position, and so 9...Qg5 was playable.
Generally speaking, I was approaching this game as one I ought to win without expending too much energy. That may not be the right attitude, but it has practical advantages on a double-round day.
9...Nf6 10.c3?
White should be challenging Black's centre before Black consolidates. That calls for 10.Nxc6 bxc6 11.c4, when Black will likely end up with a backward d pawn on a half-open file.
10...0-0 11.Nxc6 bxc6 12.Nd2?!
12.c4 was probably still the way to go, although the addition of the moves c3 and 0-0 clearly favours Black, who has counterplay against the white queenside, eg 12...Rb8 13.cxd5!? Nxd5!?
12...Rb8 13.b3 Qd6 14.c4 d4 15.exd4 Qxd4 16.Re1 e3 17.fxe3 Qxe3+ 18.Kh1 Rd8 19.Nf1
The only saving move, but good enough.
19...Rxd1 20.Nxe3
MS offered a draw in my time.
20...Rxa1 21.Rxa1 Be6 22.Bf3!?
The engines' choice, but it encourages Black to play a move he wants to play anyway. Nevertheless, the bishop is more active on f3 than on e2.
22...c5 23.Rd1 Kf8 24.Kg1
24.Rd6 is met by 24...Rb6.
24...Ke7 25.Nd5+!?
This move may be objectively fine, but it gives the higher-rated player a chance to unbalance the position.
25...Bxd5!? 26.Bxd5 Rd8 27.Re1+ Kf8 28.Bf3 Rd2 29.Re2
MS offered a draw in my time
29...Rxe2!? 30.Bxe2
A bishop is usually superior when there are rival pawn-majorities, but I felt the minor-piece ending gave me my best chance, and anyway White's queenside pawns are more-or-less fixed on the same-coloured squares as his bishop, which makes his dark squares weak.
30...Ne4 31.Bd3 Nd6
Not 31...Nc3? 32.a3 a5 (to stop the pawns rolling) 33.Kf2, when the knight is in danger of getting trapped. The engines continue 33...a4 34.bxa4 Nxa4, when White has a passed pawn. White is only slightly better, according to the engines, but Black has practically zero winning chances.
32.g4?!
Not 32.Bxh7?? g6 etc, but advancing pawns where you are weaker is dubious, especially here as the square g4 is a light one.
32...h6 33.Kf2 Ke7 34.Kf3 Kf6?
Better is 34...Ke6, keeping a watch on the queenside.
Can you find a good continuation for White?
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35.h4?
The engines give 35.b4! cxb4 36.c5 Ne8 37.Ke4 Nc7 38.Kd4, when they reckon White has full compensation for the pawn - a line that illustrates  the power of a bishop versus a knight with rival pawn-majorities.
Another move better than the text is 35.Kf4, when I intended 35...g5+!? 36.Ke3 Ke5 with a slight edge.
35...Ke5 36.Ke3 Nc8?!
I planned to continue ...Ne7-c6 and, depending on circumstances. ...Nd4 or ...Nb4, but the engines much prefer getting on with it on the kingside with ...f5 or, first, ...g6.
37.a3 a5 38.a4?
White has ensured he cannot get a passed pawn on the queenside without giving Black a protected passed pawn in return.
38...Ne7 39.Bc2 f5 40.Kf3
I felt his best chance was 40.g5, but after, say, 40...f4+ 41.Kf3 h5 42.Kg2 Nf5 43.Kh3 f3, Black has an easy win.
40...fxg4+ 41.Kxg4 Nc6 42.Kh5 Ne7
I was fairly sure 42...Nd4 also won, but there seemed more chances for Black to go wrong, and anyway it required energy-sapping calculation.
43.Kg4 g6 44.h5?
This does not help, but White's position is beyond saving.
44...g5 45.Bb1 Nc6 0-1

Lasker's Spanish Inquisiton (part eight)

IT is always interesting to see who varies first when two players repeat a variation, especially in a match.
Emanuel Lasker - David Janowski
Paris 1909, Match 2, Game 5
1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6 dxc6 5.d4 exd4 6.Qxd4 Bg4 7.Nc3 Qxd4 8.Nxd4 0-0-0 9.Nde2
Lasker played 9.Be3 the previous time he had the white pieces in this match.
9...Bc5 10.f3 Be6 11.Bd2
This looks a rather modest development of the dark-square bishop, but Lasker wants to castle long. Normally in 5.d4 lines he kept his king in the centre, moving it to the kingside later to support his kingside pawns. But the position here of the black dark-square bishop makes that plan problematic.
11...Ne7 12.0-0-0 f6 13.Nf4 Bc4!?
This may appear strange, but the idea is to prevent White easily playing Nd3 without first having to slightly compromise his queenside pawn-formation.
14.b3 Bf7 15.Nd3 Bd6 16.Bf4 Ba3+ 17.Kb1 Ng6 18.Bc1 Bd6 19.g3 c5 20.Nd5 Rhe8 21.Bb2 Bxd5!?
Giving up the bishop-pair, but getting rid of White's kingside majority. Black also gets a rook to the seventh, although this is temporary.
22.exd5 Re2 23.Rde1 Rde8 24.Kc1 Kd7 25.Rxe2 Rxe2 26.Kd1 Re3 27.Rf1 b5!?
As in game three, Janowski follows the modern black plan of pushing his queenside pawns.
28.Kd2 Re8 29.c4 c6 30.Rc1
Keeping some life in the game, whereas 30.dxc6+ Kxc6 looks very drawish.
How should Black continue?
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30...b4!?
Gaining space but starting to make his bishop look bad. On 30...cxd5, Janowski may have feared 31.cxb5 axb5 32.Nxc5+, when Black has two isolanis and White might be able to create a passed pawn on the a file. However, Black can play 31...c4 32.bxc4 dxc4 33.Rxc4 axb5 with another very drawish position. The engines also reckon Black could have kept the pawns in tension by playing 30...Rc8. The match situation - Lasker had won three of the first four games, and drawn the other - may have influenced Janowski's choice.
31.dxc6+ Kxc6 32.Re1 Ra8!?
Giving up an open file (but White's rook does not have a good entry square) in favour of possible play down the a file.
33.Ra1 Rd8 34.Ke2 a5 35.a3 Bc7 36.a4
Now all Black's queenside pawns are fixed on the same colour complex as his bishop. This is by no means fatal, but it does mean the black bishop can only have a defensive role on that part of the board, whereas both white minor pieces have targets.
36...h5 37.Rd1 h4 38.f4 hxg3 39.hxg3
Note that while White's kingside pawns are on dark squares (as are Black's), they are not, at least as yet, fixed.
39...Rh8 40.Nf2 Ne7 41.Kf3 Nf5 42.Rd5 Ne7 43.Rd1 Nf5 44.Rd5 Nd6?!
Janowski is not satisfied with a draw. In the light of what happens, it is easy to criticise this decision, but he probably felt the need to try to change the course of the match.
45.Bc1 Bb6 46.Be3 Re8
Not 46...f5? as the white knight occupies e5 via d3, but perhaps 46...g6!? is an improvement.
46.f5 Nc8?
The engines suggest 46...Nb7, but after 47.Nd3 Black has three pieces tied to the defence of his c pawn, and he is reduced to shuffling his rook about while White is free to decide how to proceed. One line, given by the engines, runs 47...Rh8 48.Nf4 (aiming for e6) Nd8 49.g4, with a position much easier for White to play.
47.Ne4 Rh8 48.Bxc5 Bc7 49.Nf2 Rh2?
Better is 49...Nb6 50.Bxb6 Bxb6, but White should win.
50.Bf8 Bb6 51.Ne4 Rh7 52.Nc5 Bc7 53.Ne6 Be5 54.Rc5+ Kd7 55.Rxa5 Rh3 56.Rd5+ Kc6 57.Nf4 Bxf4 58.Kxf4 Nb6 59.Rd6+ Kc7 60.Rd3 1-0
In the final position, Black is losing a third pawn. Janowski's game went downhill quickly, but Exchange Spanish endgames can be deceptively simple, with management of the pawns often crucial.

Friday, 17 January 2020

Lasker's Spanish Inquisition (part four)

THIS game seems to have been part of a simultaneous exhibition in the City of London given when the world champion toured the UK in 1908.
Emanuel Lasker - CE Wood
1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6 dxc6 5.d4 exd4 6.Qxd4 Qxd4 7.Nxd4 Bc5!? 8.Be3 Nf6!? 9.f3
For Alekhine's disparaging comments on Black's last two moves, albeit played in the reverse order, see https://beauchess.blogspot.com/2019/06/uncork-bubbly.html
9...0-0 10.Nd2
The most-popular move in ChessBase's 2020 Mega database, but Alekhine preferred 10.Nf5!?, commenting: "Of course!"
10...Bb6
Capablanca played the more-popular 10...Re8 six years later in a game that ended in a draw.
11.Nc4
How should Black meet the threat to his dark-square bishop?
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11...Re8?!
11...Ba7 preserves the bishop-pair, at least in the short-term. However in Spanton (168) - David Rowson (183), London Summer League 2019, there followed the novelty 12.Ne2 (not 12.Nf5?? Bxf5 13.exf5 Rfe8 14.Kf2 Rxe3 15.Nxe3 Nd5 16.Rhe1 Re8), when, with 12...Bb8, 12...b6 and 12...c5 all being unpalatable, Black played 12...Bxe3, getting a position that older engines tend to regard as level, but which Stockfish10 and Komodo10, rightly in my view, regard as better for White (1-0, 52 moves).
12.Nxb6 cxb6 13.0-0-0 c5 14.Ne2 Be6 15.Nc3 Rac8 16.Rd6 b5 17.Rhd1 h6 18.Kb1 Kh7 19.Ne2 b4 20.Nc1 Rc7 21.Nd3 Nd7 22.Nf4 Ne5 23.Nxe6 fxe6
After some middlegame manoeuvring, Lasker has engineered a position in which he has two active rooks and a bishop versus two passive rooks and a knight (it is unusual for White to end up with the sole bishop in an Exchange Spanish, but this was not the only time it was to happen to Lasker). There are many ways to continue, eg Stockfish10 and Komodo10 show White can win a pawn with 24.Bf4 Nc4 25.Rxe6! But this game was part of a simul, and it maybe Lasker relaxed his guard here …
24.Rd8? Rxd8 25.Rxd8 Rd7 26.Rxd7 Nxd7
Perhaps Lasker missed that all the rooks come off because Black threatens a back-rank mate, or it is possible he misjudged the bishop-v-knight ending.
27.Kc1 b5 28.Kd2 Kg6
There are rival pawn-majorities, which normally favours the bishop, but here it is difficult for White to create a passed pawn, but at least he should be in no danger of losing.
29.Bf4
Possibly Komodo10's 29.f4!? is better.
29...e5!?
Now the bishop has two targets (e5 and c5), but the knight easily defends them.
30.Bg3 Kf6 31.f4 exf4 32.Bxf4 Kxe6 33.Ke3 Ne5 34.Bxe5??
A familiar concept. The stronger player sees other moves lead to a dead-draw, so he makes one more attempt to change the balance, only to turn a draw into a loss.
34..Kxe5 35.b3 ½–½
Lasker presumably offered the draw, having belatedly realised it is White's king, not Black's, that will have to withdraw. The point is Black has loads of reserve tempi, while White's soon run out, eg 35...g5 36.g4 c4 37.h3 a5 etc. A lucky escape.

Wednesday, 15 January 2020

Lasker's Spanish Inquisition (part two)

EMANUEL Lasker tried the modern favourite 5.0-0 against James Mortimer at the British Chess Association congress in London in 1892, but only drew.
Two years later, in the 13th game of his first world championship match with Wilhelm Steinitz, he returned to 5.d4.
Lasker - Steinitz
1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6 dxc6 5.d4 exd4 6.Qxd4 Qxd4 7.Nxd4 c5!?
The first example of this move in ChessBase's 2020 Mega database. It is still respected today, but is second in popularity to 7...Bd7.
8.Ne2
8.Nb3 is also often seen, but the knight then becomes a target for a black queenside expansion.
8...Bd7 9.Nbc3 0-0-0 10.Bf4 Bc6
10...Bd6?! 11.Bxd6 cxd6 undoubles Black's c pawns, but gives him a weak pawn on the half-open d file.
11.0-0 Nf6 12.f3 Be7 13.Ng3 g6 14.Rfe1!?
A 'mysterious' rook move. Competing on the d file with R(either)d1 is natural.
14...Nd7 15.Nd1 Nb6 16.Nf1 Rd7 17.Be3
It is hard to guess what Lasker intended with his minor-piece manoeuvrings, but they hardly helped his position.
17...Rhd8 18.b3!?
The choice of Stockfish10 and Komodo10, but it allows Black to more-or-less forcefully undouble his c pawns, after which Black, having the bishop-pair on a board with an open centre, must be better. This suggests that while White has not played any out-and-out bad moves, his general plan (or non-plan) of seemingly dithering, has been sub-standard.
Black to make his 18th move
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18...c4! 19.Bxb6?!
Charles Devidé in A Memorial To William Steinitz, reprinted by Dover in 1974 as William Steinitz: Selected Chess Games, states: "Nf2 was much better. Lasker, however, did not discern the stratagem in its fullness." The engines also dislike the text, but reckon 19.c3 gives the best chance of holding the game.
19...cxb6 20.bxc4
The engines suggest 20.Nde3 cxb3 21.cxb3, when Black still has doubled queenside pawns, but his pieces are much more active than White's.
20...Bb4 21.c3 Bc5+ 22.Kh1 Rd3 23.Rc1 a5
White is horribly passive, but the engines reckon a better way to exploit this is to immediately probe on the kingside, their main line running 23...f5 24.Nb2 R3d7 25.exf5 Ba3 26.Re2 gxf5, when Black remains more active.
24.Nde3 f5 25.exf5 gxf5 26.h3
Devidé: "If 26.Nxf5 (then) 26...Rxf3 27.N5f3 Rf2 wins." In this line. 27.Nd4 is better, but 27...Rf2 28.Nxc6 bxc6 undoubles Black's pawns and leaves Black with the more-active pieces.
26...Rg8 27.Nd5
Nxf5 is still met by …Rxf3!
The text, which gives back White's extra pawn, is the engines' choice, but maybe 27.Kh2!? offered  more hope. The engines continue 27...Kb8 28.Kh1 Ka7 29.Kh2 (they again prefer to return the pawn with Nd5) Bd6+ 30.Kh1, at which point 30...Bf4 (Komodo10's 30...f4 is less convincing) 31.Rc2 Re8 32.Rce2 Rxc3 33.Nxf5 Rxe2 34.Rxe2 Rxc4 is clearly better for Black, despite his inferior pawn-structure, but White's protected passed pawn gives practical chances.
27...Bxd5 28.cxd5 Rxd5 29.Rcd1
The engines prefer the passive 29.Rc2, but Lasker presumably thought this unlikely to be a long-term solution.
29...Rxd1 30.Rxd1 f4 31.Kh2
The engines suggest giving up a pawn with 31.g3!? fxg3 32.Kg2, one point being that ...Re8, which proves so strong in the game, is met by Nxg3, covering the e2 entry square, but Black presumably gets on with advancing on the queenside.
31...Re8 32.a4 Kc7 33.h4 Kc6 34.c4 Bb4 35.Kh3 Re1!
Rook and bishop usually work together better than rook and knight, but here lone bishop versus lone knight is an even bigger advantage as there are rival pawn-majorities, which favours the longer-ranged bishop.
36.Rxe1 Bxe1 37.Kg4 Kc5 38.Kxf4 Kxc4 39.Ke4!?
Devidé: "It is questionable whether h5, followed by g4, would have offered a better fighting chance." The engines prefer Lasker's move.
39...Bxh4 40.g3 Bd8 41.Ne3+ Kb4 42.Kd3 Kxa4 (0-1, 55 moves).

Tuesday, 14 January 2020

Lasker's Spanish Inquisition

EMANUEL Lasker had the longest reign of any world champion, winning the title from Wilhelm Steinitz in 1894, before finally being beaten by José Capablanca in 1921.
It is sometimes claimed he was not an openings expert, perhaps because there is no opening named after him.
However, there are several important variations credited to Lasker, the most famous including his defence to the Queen's Gambit and his antidote to Evans' Gambit.
In this series I want to concentrate on another variation he pioneered, the Exchange Variation of the Spanish.
There are 26 examples in ChessBase's 2020 Mega database, including one consultation game, of Lasker having the white pieces in the Spanish Exchange.
After 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6 dxc6, Lasker played all four moves that are still popular today - 5.d4, 5.Nc3, 5.d3 and 5.0-0.
For this series I want to concentrate on Lasker's handling of 5.d4, which is the most thematic move - White immediately sets about creating a 4-3 kingside pawn-majority, which he hopes will be a winning advantage in an endgame.
But before the ending arises, White has to neutralise Black's bishop-pair in what is usually a queenless middlegame.
Lasker - William Pollock
Baltimore simul* 1892
1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6 dxc6 5.d4 Bg4!?
The first appearance of this move in Mega20. Two previous games saw 5...exd4, which is today the main line.
6.dxe5
Temporarily winning a pawn, but allowing his king to be displaced. I have instead played the reasonable alternative, 6.Be3.
6...Qxd1+ 7.Kxd1 Bc5?!
Blacks quickly came to prefer 7...0-0-0+ 8.Ke2 Re8 to be sure of regaining the pawn.
8.Ke2 0-0-0
Komodo10 prefers 8...Bd4 10.Nbd2 Bxe5, but after 11.h3 Bxf3+ 12.Nxf3, Black has no compensation for his inferior pawn-structure.
9.Be3 Be7 10.h3 Bh5 11.Nbd2 f6!?
Pollock offers to make his pawn-minus permanent in return for piece-activity.
12.Rhd1
Lasker ignores the offer as he has seen that a black pawn landing on e5 will be lost anyway.
12...fxe5 13.g4 Be8 14.Nxe5 Nf6 15.f3 h5 16.Nf1?!
This allows the h file to be opened, so probably better was 16.g5.
16...hxg4 17.hxg4 Nd7 18.Nxd7 Bxd7 19.Kd2 Rdf8 20.Kg2 Bd6 21.Ng3 Rf7
White has a large advantage, but now Lasker makes the type of tactical slip that can happen to the best of players when giving a simul
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22.Nf5?
Now Black gets his pawn back. 22.Rh1 would have prevented this.
22...Bxf5 23.exf5 Rh2+ 24.Kg1 Rxc2 25.Rd2 Rxd2 26.Bxd2
White is still slightly better as it will be easier for him to create a passed pawn.
26...Rd7 27.Bc3 Bc5+?!
Stockfish10 and Komodo10 reckon Black should start mobilising his queenside majority with 27...b5.
28.Kg2 Bd4?
The rook-and-pawn ending is far from drawn. Again better was …b5.
29.Bxd4 Rxd4 30.Rh1 b5 31.Rh7 c5
31...Rd7 32.g5 is an easy win for White.
32.Rxg7 c4 33.Kg3 b4 34.f6 c3 35.bxc3 bxc3 36.f7 Rd8 37.Rg8 c2 38.Rxd8+ Kb7
The only chance, but it is insufficient.
39.f8=Q c1=Q 40.Qb4+ Kc6 41.Qd6+!?
Unnecessary, but elegant.
41...Kb7 42.Qd5+ 1-0
*English-born Pollock was a recognised chess master, and at the time of this game was the resident professional at the Baltimore chess club. Lasker may have chosen to play the Spanish Exchange, apparently for the first time, to try to get queens off early and so reduce his strong opponent's tactical chances.

Tuesday, 31 December 2019

Hastings Continued

Faced a Slovak in round four of Hastings Masters this afternoon.
Spanton (1951/168) - Svetlana Sucikova (2160/196)
Caro-Kann Classical
1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Bf5 5.Ng3 Bg6 6.h4 h6 7.Nf3 Nd7 8.h5 Bh7 9.Bd3 Bxd3 10.Qxd3
There are more than 19,000 games with this position in ChessBase's 2020 Mega database.
10...e6 11.Bd2
Joe Gallagher in Starting Out: The Caro Kann argues that 11.Bf4 is more precise as it is more active if Black castles short, and he says some players of the black pieces will only castle short if White has played Bd2.
11...Ngf6 12.0-0-0 Be7 13.Ne4
More popular is 13.Kb1, but both moves have been played by lots of strong players.
13...Nxe4 14.Qxe4 Nf6 15.Qe2 Qd5 16.c4 Qe4 17.Qxe4 Nxe4 18.Be3 0-0 19.Ne5 Rfd8 20.g4 Rac8 21.Kb1?!
Decentralising. The main move - we are still in theory - is 21.f3, with the black knight usually retreating to d6. Komodo10 reckons the position is equal, but Stockfish10 gives White a slight edge.
21...Bd6
At last a new move, or at least one not in Mega20. It is Komodo10's choice, but Stockfish10 prefers 21...Bf6.
22.f3 Ng5 23.Bxg5!?
This leaves Black with bishop versus knight with rooks on the board, which usually favours the side with the bishop. However, here the knight is well-placed on the fifth rank, and can only be kicked by weakening the e pawn.
23...hxg5 24.Rhe1 Rc7 25.Kc2 f6 26.Nd3 Kf7 27.c5?!
The engines prefer a move I seriously considered, namely 27.Nc5!? I rejected it because 27...Bxc5 28.dxc5 Rcd7 29.Rxd7+ Rxd7 gives Black the more promising pawn-majority for creating a passed pawn. Komodo10 comes to give Black a slight edge, but Stockfish10 reckons 30.Kc3 equalises.
27...Bg3 28.Re4
Almost certainly better than 28.Rg1?!, which makes it impossible, as far as I can tell, for White to defend the weak d pawn.
28...Rcd7 29.Kc3 Rd5 30.Rd2
Black is clearly better; the only question is whether it is enough for a win.
30...Bc7 31.b4
Can Black get an advantage here?
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31...f5?!
The engines give 31...a5 32.a3 b5, when Stockfish10 continues 33.Ne1 e5 34.Rd1 f5 35.gxf5 exd4+ 36.Kc2 Be5 37.Nd3 Bf6 38.bxa5 Ra8 39.Re6 Ra6 40.Rd6 Rxf5 41.Kb3 Rxa5 42.Rxc6 Rxf3 43.Rb6 with advantage to Black. Komodo10 gives 33.f4 f5 34.Ne5+ Bxe5 35.Rxe5 gxf4 36.Rxd5 axb4+ 37.axb4 Rxd5 38.g5 e5 39.dxe5 Rxe5 40.Rd7+ with counterplay for White, but much prefers Black.
32.Ne5+
Now White seems fine.
32...Kf6 33.Ree2 Bb8 34.Kc4 Bc7 35.Kc3 Bb8 36.Kc4 a6 37.Kc3
The engines reckon White is better after 37.Ng6, but I fear I was concentrating so much on avoiding defeat that I rarely looked for ways to get an advantage.
37...Bc7 38.Kc4 Ra8 39.a4 Rad8
39...Bxe5 40.dxe5+ Rxe5 41.Rxe5 Kxe5 temporarily wins a pawn, but White gets strong counterplay with 42.Rd7.
40.a5 Bb8 41.Kc3 Bc7 42.Kc4 Bxe5 43.Rxe5 Kf7 44.Kc3 Ke7!? 45.Rde2 Rxe5 46.Rxe5 Rf8 47.Kd3 fxg4 48.fxg4 Rf3+ 49.Re3 Rf1
49...Rf4 50.Re4 Rxe4 51.Kxe4 Kf6 52.Ke3 e5 53.Ke4 is a draw, but not 53.dxe5+?? Kxe5 etc.
50.Rh3
Active defence.
50...Rb1 51.Kc4 Rc1+ 52.Kd3 Ra1 53.Kc4 Rg1 54.h6 gxh6 55.Rxh6 Kd7
55...Rxg4 56.Rh7+ Kf6 57.Rxb7 is also a draw, according to the engines.
56.Rh7+ Kc8 57.Rh8+ Kc7 58.Rh7+ Kb8 59.Rh8+ Ka7 60.Re8 Rxg4 61.Rxe6 Rg1 62.Re8 g4 63.Rg8 g3 64.Kb3
Not 64.Kd3? g2 65.Ke2 Rb1 66.Rxg2 Rxb4, when only Black can win.
The game finished:
64...Rb1+ 65.Kc3 Rc1+ 66.Kb3 Rg1 67.Kc3 Rc1+ 68.Kb3 Rg1 69.Kc3 g2 70.Kb2 Rd1 ½–½

Monday, 25 November 2019

Fascinating Ending

CAME across this exciting endgame in 500 Master Games Of Chess by Savielly Tartakower and Julius du Mont. Notes in italics are algebraicised from the book.
White to make his 28th move in Sir George Thomas - Alexander Alekhine, Hastings 1933-4
Although a simplified endgame is reached, there are still many problems to be solved.
Black has more space on the queenside, and has the chance to invade White's position there on the light squares. However, Black's bishop is semi-bad in that his central pawn is on a dark square. In addition, the combination of queen-and-knight can sometimes outplay a queen-and-bishop, although here the knight has no outpost (Black will be able to keep it out of f5) or obvious targets.
The analysis engines Komodo10 and Stockfish10 reckon the position is equal.
28.Qd3
Occupying the open file, and solidifying the queenside in that a later ...Qb3 would no longer attack two en-prise men.
28...Bg5 29.Ne3
Heading for f5.
29...g6
Black has an easy draw with 29...Qxe3, but the world champion wants more.
30.Kh2
As a rule, kings are safest when snug against their defensive pawn-wall. An added factor here is that White wants to remove the danger of Black creating threats with a back-rank check.
30...Qb3
An expedition which must be taken seriously.
31.Qe2!?
It may have been better to threaten an exchange of queens with 31.Qc2, or avoid an exchange of minor pieces with 31.Nd1.
31...h5
The engines give 31...Bf4+!? 32.Kg1 Bxe3 33.fxe3, when Stockfish10 reckons Black is winning, but Komodo10's assessment of a slight edge to Black seems closer to the truth.
32.g3 h4
The engines still much prefer ...Bxe3.
33.gxh4
Countering his opponent's plans by … falling in with them.
33...Bxh4 34.Ng4 Bg5 35.Ne3!?
He prevents 35...Bc1 and avoids the casual trap 35.Nxe5 Bf4+.
The engines prefer 35.Kg2 because, once again, they like Black's chances after ...Bxe3.
35...Qa2 36.Qc2 Qa1 37.Kg2 Qe1
This was Black's last chance to play an effective ...Bxe3, which the engines still reckon gives Black good winning chances. The players clearly felt otherwise.
38.Qd3 Qc1
Playing …Bxe3 here would not have been as significant as before as White replies 39.Qxe3, when 39...Qxe3 gives White doubled pawns, but they would not be so weak with queens off. After 40.fxe3, Stockfish10 reckons Black has the upper hand (Komodo10 gives Black a slight edge), but it is hard to see how Black makes progress.
39.Ng4 Qxb2
White's queenside collapses, but White has counterplay.
40.Qd7 Qxa3
If 40...Qxc3 [then] 41.Qe8+ Kg7 42.Nxe5 etc.
It is hard to guess what Tartakower missed here, since the obvious 42...Qb3 protects f7 and leaves Black dominant on the queenside. A better defence, therefore, seems to be the engines' 41.h4! Bxh4 42.Nh6+ Kg7 43.Nxf7 Qd4 44.Nd6+ Kh6 45.Kh3 Bxf2 46.Nf5+ gxf5 47.Qe6+, when White has a perpetual.
41.Nxe5 Qe7 42.Qxe7 Bxe7 43.Nxc6
Even the end of the ending is furiously contested
An ending with rival pawn-majorities usually favours a bishop over a knight, and this position is no exception. But here this factor is countered to an extent by White having the better king (it can get to the centre, or attack on the kingside, quicker than the black king).
43...Bf6
Tartakower points out that sacing the bishop with 43...a4?? loses as the check 44.Nxe7+ lets the knight bounce back to the queenside with 45.Nd5.
44.Nxa5 Bxc3 45.Nb3 Be5 46.Kf3 Kf8 47.Kg4 Ke7 48.f4 Bc3 49.h4 Kd6 50.h5 gxh5+ 51.Kxh5 b4 52.Kg5 Bg7
Thinking of the defensive.
53.Kf5 Kc6 54.e5 Kd5 55.Na5 Bh6 56.Nb3 Kc4 57.Na5+ Kd3 58.Nb3 Ke3
With a hold on both wings, Black has at last obtained the maximum effectiveness of his forces.
59.Na1
Alone this problem-move saves the situation (59...Bxf4 60.Nc2+).
Alas, this is not the case. 59.Na5 also saves the day, as 59...Bxf4 is met by 60.Nc6 b3 61.Na5 b2 62.Nc4+. The engines also point out 59.e6 fxe6+ 60.Kxe6 Bxf4 61.Kd5 Kd3 62.Nc5+ Kc3 63.Na6! b3 64.Nc5 b2 65.Na4+.
59...Kd3 60.Nb3 Kc2 61.Na5 Kc3 62.Ke4 Bf8 63.f5 ½–½
After 63...b3 64.Nxb3 Kxb3 White will take care not to play 65.e6 f6 etc, but will enforce the peace treaty by 65.f6 Kc4 66.e6 fxe6 67.Ke5 etc.

Wednesday, 4 September 2019

Six Of The Worst?

I HAD a lost position in each of my first five games in the 'Paignton' premier, so I entered today's sixth round determined to avoid a repeat performance.
Spanton (1881/168) - Eddie Hurst (1917/162)
Caro-Kann Modern Variation
1.e4 d6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nd7 5.Nf3
The most popular move in ChessBase's 2019 Mega database, but White's main alternatives, 5.Bc4, 5.Ng5, 5.Bd3 and even 5.Qe2, score much better percentage-wise.
5...Ngf6 6.Ng3 e6 7.Bd3 Bd6!?
This aggressive deployment of the dark-square bishop, which was a favourite of Harry Golombek and has been played more recently by Julian Hodgson, is not liked by the analysis engines Stockfish10 and Komodo10.
8.0-0 0-0 9.c4!?
Another move not liked by the engines. My idea was to take d5 away from a black knight as from there it would threaten ...Nb4 and …Nf4. The main move is 9.Re1, and if 9...Nd5, then 10.c3, planning to meet 10...Nf4 by 11.Bc2 or 11.Bb1.
9...b6 10.Re1 Qc7 11.Bd2
The bishop is headed for c3.
11...c5 12.Bc3 Bb7 13.Qe2 a6!?
Possibly a new move. The idea is to cover the b5 square in the event of ...cxd4 being met by Nxd4. In the stem game, Alexander Chistiakov - Vladimir Makogonov, 13th USSR Championship semi-final 1941, play went 13...cxd4 14.Bxd4 Rfd8, with a roughly equal position (but 0-1, 30 moves).
14.Rad1 cxd4 15.Nxd4 Nc5 16.Bc2 Bxg3!
Giving up the bishop-pair looks strange, but Black gets a monster knight on e4, and it is the first choice of both engines. Stockfish10 also likes 16...Rac8, and if 17.b4, hoping for 17...Ncd7? 18.Nxe6, then 17...Bxg3.
17.hxg3 Nce4 18.Bb4 Rfd8 19.Nf3!?
The e4 knight is very hard to dislodge, so I decided to retreat my knight to facilitate exchanges that I hoped would help me exploit my bishops. I rejected 19.g4!? h6 20.f3 as too weakening.
19...b5?!
The engines prefer a quiet move such as 19...h6.
20.cxb5 Qb6?
I completely failed to spot the point of this move, but it should not work. The engines suggest 20...axb5 or 20...Rxd1 21.Rxd1 axb5, in each case with an edge for White.
White to make his 21st move
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21.Be7?
White is substantially better after 21.Rxd8+ Rxd8 22.Bxe4 Nxe4 23.bxa6 as 23...Nxg3? fails to 24.Qe5.
21...Nxg3?
This came as a shock but, as EH said in the postmortem, it was better to preface this capture with an exchange of rooks.
22.Qe3
The best move in a tricky position. There now follows a forced sequence that leads to White gaining the upper hand.
22...Qxe3 23.Rxd8+ Rxd8 24.Rxe3 Rc8 25.Bxf6
Even better seems to be 25.Bd3! which I believe I rejected because of 25...Nd5, but then comes 26.bxa6 Ba8 27.Re1 Nxe7 28.fxg3, when White's queenside pawns are very dangerous. Black could instead play 25...Nf5, but then 26.Bxf5 exf5 27.bxa6 Bxa6 28.Bxf6 gxf6 is again substantially better for White.
25...Rxc2 26.fxg3?
Throwing away White's advantage. Better was 26.Ne1 Ne2+ 27.Kf1, when the engines give best play as 27...Rc8 28.Kxe2 gxf6 29.bxa6 Bxa6+ 30.Kd2. Compared with the game, White's kingside pawn-structure is much better and his king is more central.
26...gxf6 27.bxa6 Bxa6
This ending offers equal chances, according to the engines. White's queenside pawns look threatening, but they are a long way from queening, and Black has the better minor piece for dealing with rival pawn-majorities and for cooperating with a rook.
28.Ra3?!
Almost certainly better was 28.Rb3 as the text wastes a tempo improving the position of the black bishop.
28...Bb7 29.Rb3 Bd5 30.Rb8+ Kg7 31.a4 e5
The engines prefer 31...Rc1+ followed by ...Ra1, or 31...f5 followed by ...Kf6.
32.Ne1?
I should have got on with pushing my queenside pawns, ie 32.a5 or 32.b4, as in each case 32...e4? is a mistake because of 33.Nd4.
32...Re2?
Black is better after 32...Rc1+ 33.Kf2 Ra1.
33.Nf3 f5?
33...Rc2 would have returned to what the engines reckon is a dead-equal position.
34.a5 Kf6
The engines alternate between the text and 34...Rc2, in each case preferring White.
35.a6 e4??
Best, according to the engines, was 35...Rc2 36.Rb6+ Ke7 37.Nxe5!? Rxg2+ 38.Kf1, with a slight edge for White in what remains a sharp ending.
36.Rb6+ Ke7 37.Nd4 Be6??
The final blunder, but after the engines' mainline of 37...Re1+ 38.Kf2 Ra1 39.Nxf5+, White has a winning advantage.
38.Nxe2 1-0