Showing posts with label Richard Réti. Show all posts
Showing posts with label Richard Réti. Show all posts

Sunday, 6 February 2022

Danish Pasting

THIS brevity from 500 Master Games Of Chess by Savielly Tartakower and Julius du Mont caught my eye for its instructional worth as well as its entertainment value.
The authors' notes, algebraicised, are in italics.

Gustaf Nyholm - Richard Réti
Baden (Austria) 1914
Danish Gambit
1.e4 e5 2.d4 exd4 3.c3 dxc3 4.Bc4 d5
As in all open games (1.e4 e5), this move means for Black the emancipation of his game. Other methods of declining the third pawn (such as 4...Bb4 or 4...c2 or 4...d6 or 4...Nc6 or, finally, 4...Nf6) are far less effective.
Nevertheless the text is only the 10th most-popular move in ChessBase's 2022 Mega database.
5.Bxd5
After 5.exd5, closing the bishop's diagonal, Black can develop without difficulty.
At the same tournament the game Nyholm - Rudolf Spielmann saw 5.exd5 cxb2 6.Bxb2 Nf6 7.Nc3 Nbd7 8.Nf3 Bb4 9.0-0 0-0, which the analysis engines Stockfish14.1 and Komodo12.1.1 reckon is at least slightly better for Black (0-1, 26 moves).
5...cxb2 6.Bxb2 Nf6
How should White proceed?
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7.Nf3?
The following stratagem would be insufficient: 7.Bxf7+ Kxf7 8.Qxd8, on the score of 8...Bb4+ 9.Qd2 Bxd2+ 10.Nxd2 c5 followed by ...Be6 and ...Rd8, and Black's pawn-majority on the queenside will tell in the endgame.
The engines reckon the position after 10...c5 favours, if anyone, White. The game Nyholm - Algot Ahlberg, Nordic Congress (Gothenburg) 1919, continued 11.Ngf3 Be6?! 12.Ng5+ Ke7 13.f4 Rd8, when the engines reckon 14.f5 Bg8 15.e5 would have given White a large advantage. Instead the game continuation, 14.Nxe6 Kxe6 15.0-0-0 Nc6, divides the engines, Stockfish14.1 giving White the upper hand but Komodo12.1.1 calling the position equal (0-1, 34 moves).
A possible improvement for Black is 10...Re8, as played in Nyholm - Tartakower, Baden 1914, which continued 11.f3 Nc6 12.Rc1 Be6 13.a3 Rad8 14.Ne2, which also divides the engines, Stockfish14.1 again giving White the upper hand but Komodo12.1.1 again calling the position equal (0-1, 39 moves).
It is probably fair to say Nyholm's poor score with the Danish Gambit, at least in Mega22. has more to do with his opponents' superior skills than with the opening's intrinsic value. Certainly, despite the verdict in the book, 7.Bxf7+!? is a major improvement on the text.
7...Bb4+ 8.Kf1
Or 8.Nc3 Nxd5 9.exd5 Qe7+, and the simplification of the play is in Black's favour. After the text move, however, White's position is disorganised.
8...0-0?!
Evading the threats 9.Qa4+ or (after 8...c6) 9.Bxf7+ Kxf7 10.Qb3+ followed by Qxb4. Henceforth Black will have the initiative.
A better way to safeguard the bishop seems to be 8...Na6.
What should White play?
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9.Qb3?
White can restore material equality with 9.Bxf7+ as 9...Rxf7?? loses to 10.Qxd8+. Instead the engines reckon Black should play 9...Kh8, retaining a large advantage but one much smaller than in the game.
9...Nc6!?
Very subtle indeed! If now White were to be tempted by the lure of a piece to be won, the sequel would be: 10.Bxc6 bxc6 11.Qxb4 Rb8 12.Qd4 (12.Qxb8 Ba6+) Rxb2 13.Qxb2 Qd1+ 14.Ne1 Ba6+ 15.Kg1 Qxe1#.
10.Nc3 Qe7 11.a3 Bd6 12.Re1 Ne5
The manner in which Black now proceeds to gain more and more territory is instructive.
13.Nxe5 Bxe5 14.Bc4 c6 15.h4 b5 16.Be2 Be6 17.Qc2 Qc5 18.Rc1 Rfd8 19.g3 a5 20.Qb1 Rd2!?
In effecting this occupation of the seventh rank, Black had to make exact calculations regarding the effect of a "discovery" by the white knight (21.Nd5 or 21.Nxb5).
21.Nd5
If 21.Nxb5 the engines give 21...Bc4 22.Rxc4 Qxb5 23.Qc1 Qxb2, when Black has won a knight.
21...Rxb2 22.Qxb2?
This loses a piece, Black's rejoinder being most ingenious, but after 22.Nxf6+ Bxf6 23.Qxb2 Bxb2 24.Rxc5 a4 25.Rxc6 b4 26.axb4 a6 White's cause is equally lost.
But after the book's line White is the exchange and a pawn up, so 27.Kg2 a2 28.b5 a1=Q 29.Rxa1 Bxa1 30.b6 is not so clear - Black has a bishop for two pawns but the b pawn is dangerous, especially bearing in mind Black's vulnerability on the back rank. 
22...Qxd5 23.cxd5 Bxb2 24.Rc2 Bxd5 0-1

Sunday, 31 May 2020

Lockdown Chess

THERE are few, if any, signs of a return of over-the-board chess in Britain.
Perhaps hopes will rise if the government switches from two-metre social-distancing to the World Health Organisation-recommended one-metre.
Meanwhile many players are making do with playing over the internet, often at fast time limits although there have been some attempts at more-normal time controls.
The former does not interest me as, apart from the fact I have BT disconnection-prone home broadband, I play over-the-board chess too quickly and fear playing at even faster time limits would encourage me to play even faster OTB.
And more-normal time limits online are, as many people expected, plagued by cheating and suspicions of cheating.
However I was fortunate to be invited to play in the 6th British Webserver Championship, which is being run by the Fide-approved International Correspondence Chess Federation.
ICCF chess is virtually immune from cheating, for the simple reason that engines are allowed.
People who do not play correspondence chess often ask: what's the point if engines are involved?
Well the point is that human+engine is stronger than engine alone, or at least should be, which is why every game of correspondence chess does not end in a draw.
I am playing on board thee for Lean Thinkers in division two, which consists of seven teams, and is run as a single round-robin, ie you play each opponent once rather than once with white and once with black.
My first two games to finish were draws. Here is the third one.
Mel Suffield (2060) - Spanton (2256)
Maróczy Bind
1.e4 c5 2.Nf3 g6
Engines are notoriously weak at playing openings. They are so weak that I believe I am right in saying there has never been a match between a top computer and a strong player in which the engine was allowed to pick its own moves from the start. Instead an engine is supplied with an opening book, usually compiled by a grandmaster in collaboration with computer programmers, that it is forced to follow until it is trusted to 'think' for itself.
At correspondence chess, however, players will usually pick their own opening moves while consulting books and databases. One problem with this approach is that the game may quickly reach a position an engine is not comfortable with.
3.c4 Nc6 4.d4 cxd4 5.Nxd4
We have reached the basic starting position of the Maróczy Bind. Black's decision to allow the bind used to be regarded as dubious strategy, or as downright bad. For instance Reuben Fine in The Ideas Behind The Chess Openings (Bell 1948) wrote of the Sicilian Defence: "Black must never allow White to play P-QB4 in the opening because he then has no counterplay on the QB file and is thereby doomed to passivity." Current thinking is that the Maróczy Bind does indeed give White an edge, but that the edge is within the drawing margin, so allowing c4 is viable. Engines do not like it for Black, however, so this arguably is a case of where human+engine is weaker than engine alone.
5...Bg7 6.Be3 Nf6 7.Nc3 d6
More popular in ChessBase's 2020 Mega database are 7...0-0 and 7...Ng4!?
8.Be2 0-0 9.0-0 Bd7
This move appears more than 10,000 times in Mega20, but a major alternative is 9...Nxd4, transposing into a line of the Gurgenidze System, although in that system Black usually captures on d4 at an earlier point.
10.Qd2
Easily White's most-popular continuation, but avoiding an exchange of knights with Nc2 has been recommended in repertoire books, although normally Nc2 is recommended earlier in the move-order to avoid ...Nxd4.
10...Nxd4 11.Bxd4 Bc6
We are quite some way into the game, but this position has been reached almost 3,500 times in Mega20 - opening 'knowledge' tends to last longer in correspondence chess!
12.f3 Nd7!?
This is the start of a common manoeuvre in the Maróczy Bind, but the move may surprise players unfamiliar with this opening system as Black is 'risking' having his fianchettoed bishop exchanged.
13.Be3!?
This is White's normal reply. 13.Bxg7 is certainly playable but is unpopular for two reasons: a) exchanges normally favour Black in the Maróczy as Black has less space, b) exchanging dark-square bishops leaves White weak on the dark squares, and flies in the face of the rule-of-thumb that when you have a bad bishop (White's light-square bishop here) you should avoid swopping off your good one.
13...a5 14.b3 Nc5 15.Rab1 Qb6!?
Another strange-looking move, but Andrew Greet in Staring Out: The Accelerated Dragon (Everyman 2008) explains: "Station(ing) the queen opposite an enemy bishop ... is only temporary. Black is planning ...Rfc8, after which the queen will drop back to d8. Then the black rooks will be ready to anticipate any opening of the queenside (typically involving a3 and b4), while the queen may find a useful role on the kingside."
16.Rfc1 Rfc8 17.Rc2
Greet gives this an exclamation mark, pointing out that 17.a3 runs into 17...Nxb3! 18.Bxb6 Nxd2 19.Rb2 Nxc4 20.Bxc4 Bd7.
17...Qb4
Greet recommends this "useful refinement," which threatens 18...a4, over the much more popular 17...Qd8. The idea is that after the "more or less forced" ...
18.Qc1 Qb6
... the white queen is misplaced. However he does not say what to do if White replies ...
19.Qd2!?
... which could be a tacit draw offer. Engines prefer White, so I guess objectively Black should play 19...Qb4, but I let the game carry on with ...
19...Qd8!?
So the game has transposed to a mainline position of the Maróczy that occurs 435 times in Mega20.
20.Bf1 b6!?
Greet gives a game in which he played ...Be5 but says he would, if having the position again, "probably prefer" ...h5, which is the most-popular choice in Mega20. The idea is to follow up with ...Kh7 and ...Qh8!? The text is a useful solidifying move that basically waits to see what White does next.
21.Rd1 Rab8!?
The game Emir Dizdarević (2520) - Duško Prelević (2328), Bosnia & Herzegovina Team Championship 2004, saw ...Qd7, Bd4!? Bxd4, Qxd4 when, despite my comments at move 13, White is better, according to Stockfish11 and Komodo11.01.
In 2017 the game Jinshi Bai (2556) - Di Li (2485), Chinese Rapid Championship, was drawn after ...Be5, Bg5 Ne6, Be3 Nc5, Bg5 Ne6 etc.
The idea of the text, which may be a novelty, is to protect b6 so the black queen can move without fear of the b6 pawn becoming en prise.
22.g3 Qf8 23.Bh3 Rd8 24.Bh3 Re8 25.Bf4 Rb7
The engines prefer 25...h6 or 25...Kh8. The text gets the queen's rook off the same diagonal as White's dark-square bishop. Generally speaking in the Maróczy, Black has to bide his time, hoping to get in the pawn-break ...b5 or ...d5 or ...f5. Meanwhile, engines like White's space advantage.
26.Bg5
White too generally manoeuvres, probing for weaknesses.  Stockfish11 suggests 26.Bg2, while Komodo11.01 likes 26.Qf2 and 26.Nc3.
26...h6 27.Bf4 Kh7
White's 26.Bg5 followed by 27.Bf4 gave Black two tempi to play 26...h6 and 27...Kh7. The question is, who has this helped? I cannot give a definitive answer, but the engines are starting to diverge - Stockfish11 reckons White now has the upper hand, ie about three-quarters of a pawn, while Komodo11.01 reckons White's edge is more like a quarter of a pawn. Over the board I doubt if either advantage is all that significant at club level, but it can be a different matter in correspondence chess.
28.Rcc1 Qh8
This is sometimes known as a Réti queen in honour of Richard Réti, who popularised the idea of manoeuvring a queen to a corner square. In this position there is no doubt Black controls the long dark diagonal, but it is less clear whether this gives any special benefit. However it is not as if the queen had much scope on f8.
29.Be3 e6!?
Forcing the knight from d5 must help Black's cause ... provided the black position can stand the weakening of d6.
30.Nc3 Rd7 31.Ne2 Rdd8 32.Qc2?!
The engines suggest 32.Nf4 or 32.Nc3. The problem with the text is it allows Black to get in one of the three desirable pawn-breaks.
32...d5! 33.Bxc5 bxc5 34.cxd5 exd5 35.Qxc5 Ba8 36.Qa7
This is the engines' choice. Clearly White cannot capture on d5 because the e2 knight will hang, and if 36.Qxa5?! then 36...dxe4 when the white king starts to look vulnerable, eg 37.Rxd8 Rxd8 38.f4 Bd4+ 39.Kh1 Bb2 40.Re1 Rd3 with lots of pressure for a pawn, or 37.f4 Rd3, again with plenty of compensation, while 37.fxe4?! Bxe4 seems even worse - the black bishops are very powerful on an open board.
36...Qf8 37.e5
Returning the pawn like this is how the engines want to play it.
37...Bxe5 38.Nd4
Black's passed pawn must be blockaded, according to the engines, eg 38.Qxa5?! d4 39.Rd3 Qe7 is virtually winning for Black, they reckon.
38...Qe7 39.Qxe7 Rxe7 40.f4
Also very playable, and certain to get rid of the bishop-pair, is 40.Nc6 Bxc6 41.Rxc6.
40...Bxd4+!?
Giving up the bishop-pair and leaving White with the better remaining bishop, but Black gets a rook to the seventh.
41.Rxd4 Re2 42.Ra4
42.a4 lets White maintain a blockader on d4, but the position is equal in either case, according to the engines.
42...d4
White only has one good move
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43.Bf1?!
Worse is 43.Rxa5? d3, eg 44.Rd1 Bf3 45.Bf1 Rxh2! 46.Rxd3 Rh1+ 47.Kf2 Rxf1+ etc, or 44.Bf1 d2 45.Rd1 Bf3 etc. But White seems fine after 43.Rd1, eg 43...d3 44.Bf1 Re3 45.Rd2 (or 45.Kf2). MS said after the game he got his moves "in the wrong order."
43...Rd2!
This prevents a blockade. True, after ...
44.Rxa5
... White has a pair of connected queenside passed pawns, but the black passer is far enough advanced to beat them.
44...d3 45.Ra7
Komodo11.01 reckons White can draw with 45.Ra4 but eventually comes to agree with Stockfish11 that Black is much better after 45...Bf3 47.Rc7 Kg8 48.Raa7 Re8 49.Re7 (not 49.Rxf7+ Re1) Rxe7 50.Rxe7 Rd1, which virtually transposes to a position - winning for Black - reached in the game.
45...Bd5 46.Re1?!
White almost certainly puts up better resistance with 46.Rac7, eg 46...Kg7 47.R7c3 Be4 48.a4 Rb2 49.Rd1 d2 50.Kf2 Bc2 51.Rxc2 Rxc2 when White has a pawn for the exchange. The engines agree Black is much better, but there is a lot of play left.
46...Kg8 47.h3 h5 48.Ra5 Bf3 49.Rae5 Rd1 50.Re8+ Rxe8 51.Rxe8+ Kg7 52.Kf2 Rxf1+ 53.Kxf1 d2 54.Rd8 d1=Q+ 55.Rxd1 Bxd1
White has two pawns for a bishop but his position is hopeless.
The game finished:
56.Kf2 Kf6 57.Ke3 Kf5 58.b4 Ba4 59.Kf3 Bc6+ 60.Ke3 Bg2 61.g4+ hxg4 0-1

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