Showing posts with label Tal. Show all posts
Showing posts with label Tal. Show all posts

Thursday, 10 September 2020

Champion Of Champions (part 13)

HERE is the updated tournament bracket ahead of the semi-finals.

Round of 16               Quarter-Finals          Semi-Finals               Final
1. Steinitz
v----------------------------Carlsen
16. Carlsen (+102.5)
                                    v................................Tal
8.Tal (+8.5)
v----------------------------Tal (+79.5)
9.Petrosian
                                                                      v...............................
6. Botvinnik (+66)
v----------------------------Botvinnik (+18.5)
11. Fischer
                                    v.................................Botvinnik
13. Kasparov
v----------------------------Alekhine
4. Alekhine (+21.5)

3. Capablanca
v----------------------------Kramnik (+118)
14. Kramnik (+12)
                                     v................................Kramnik
5. Euwe
v----------------------------Karpov
12. Karpov (+11.5)
                                                                       v...............................
7. Smyslov (+18)
v----------------------------Smyslov (+11.5)
10. Spassky
                                     v................................Smyslov
15. Anand
v----------------------------Lasker
2. Lasker (+50.5)

Semi-Finals
Match One: Tal v Botvinnik
Game One
Mikhail Tal - Mikhail Botvinnik
French Tarrasch
1.e4 e6 2.d4 d5 3.Nd2
As noted in part two of this series. when Tal 'played' Petrosian, there are 49 examples of Tal choosing 3.Nd2 in ChessBase's 2020 Mega database, compared with 46 examples of the arguably more Tal-like 3.Nc3.
3...c5 4.Ngf3 Nc6
Botvinnik played this once and 4...a6 once, but lost with the latter and won with the former, so 4...Nc6 is chosen on tiebreak.
5.exd5
Tal played this and 7.Bb5 seven times each, in both cases scoring 79%, but his rating performance was much better with the text.
5...exd5 6.Bb5 cxd4
Botvinnik played this and 6...Bd6 twice each, scoring 50% with the latter but a win and a draw with the text.
Tal did not face 6...cxd4, so this is as far as we can go
The analysis engines Stockfish11 and Komodo11.01 give Tal an averaged advantage of +52.5 - a large score for Botvinnik to overcome.

Game Two
Mikhail Botvinnik - Mikhail Tal
Nimzo-Indian
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4
There are 81 games in Mega20 in which Tal played the text, compared with 10 for 3...c5. He scored much better with the latter, but moves are chosen for 'games' in Champion Of Champions by popularity, not success.
4.e3 0-0 5.Bd3 d5 6.a3 dxc4 7.Bxc4 Bd6 8.Nf3 Nc6 9.b4 e5 10.Bb2 Bg4 11.d5
Botvinnik played the text and 11.dxe5 once each, drawing with the latter but winning with 11.d5.
11...Ne7 12.h3 Bd7 13.Ng5 Ng6 14.Ne6 fxe6 15.dxe6 Kh8 16.exd7 Qxd7 17.0-0 Qf5 18.Nd5 Ng8 19.Qg4 Qc2 20.Qe2 Qf5 21.Qg4 Qc2 22.Qe2 Qf5 23.e4 Qd7 24.Rad1 Rad8 25.Qg4 Qe8 26.g3 Nh6 27.Qh5 Ng8 28.Qe2 N6e7 29.Ne3 Nh6 30.Ng4 Nxg4 31.hxg4 Nc6 32.Kg2 Be7 33.Bd5 Nd4 34.Bxd4 exd4 35.Bc4 c5 36.b5 Bf6 37.f4 d3 38.Rxd3 Rxd3 39.Bxd3 Bd4 40.e5 g6 41.Rh1 Kg7 42.Qe4 b6 43.Bc4
We have reached the final position - Tal resigned here - of  the third game from the Botvinnik-Tal world championship match of 1961
The engines give White an averaged advantage of +459, meaning Botvinnik has well and truly overcome his 52.5 deficit from game one.
Here is the updated tournament bracket.

Round of 16               Quarter-Finals          Semi-Finals                      Final
1. Steinitz
v----------------------------Carlsen
16. Carlsen (+102.5)
                                    v................................Tal
8.Tal (+8.5)
v----------------------------Tal (+79.5)
9.Petrosian
                                                                      v.....................................Botvinnik
6. Botvinnik (+66)
v----------------------------Botvinnik (+18.5)
11. Fischer
                                    v.................................Botvinnik (+406.5)
13. Kasparov
v----------------------------Alekhine
4. Alekhine (+21.5)

3. Capablanca
v----------------------------Kramnik (+118)
14. Kramnik (+12)
                                     v................................Kramnik
5. Euwe
v----------------------------Karpov
12. Karpov (+11.5)
                                                                       v...............................
7. Smyslov (+18)
v----------------------------Smyslov (+11.5)
10. Spassky
                                     v................................Smyslov
15. Anand
v----------------------------Lasker
2. Lasker (+50.5)

Sunday, 30 August 2020

Champion Of Champions (part two)

HERE is how the tournament bracket looks after one match.

Round of 16               Quarter-Finals
1. Steinitz
v----------------------------Carlsen
16. Carlsen (+102.5)

8.Tal
v--------------------------
9.Petrosian

6. Botvinnik
v--------------------------
11. Fischer

13. Kasparov
v--------------------------
4. Alekhine

3. Capablanca
v--------------------------
14. Kramnik

5. Euwe
v--------------------------
12. Karpov

7. Smyslov
v--------------------------
10. Spassky

15. Anand
v--------------------------
2. Lasker

Round of 16
Match Two: Tal v Petrosian
Game One
Mikhail Tal - Tigran V Petrosian
French Tarrasch
1.e4 e6
This narrowly beats 1...c5 by 164 appearances to 160 in ChessBase's 2020 Mega database as Petrosian's favourite reply to 1.e4.
2.d4 d5 3.Nd2!?
Another narrow decision - Tal preferred this over 3.Nc3 by 49 games to 46.
3...c5 4.Ngf3 Nf6 5.exd5 exd5
Petrosian has four games with the text and four with 5...Nxd5. He scored 50% with both moves, but the former wins on tiebreak as none of the 5...Nxd5 games were when he had a Fide rating.
6.Bb5+ Bd7 7.Bxd7+ Nbxd7 8.0-0 Be7 9.dxc5 Nxc5 10.Nb3 Nce4
Finally we have reached a position that does not occur in Tal's games
Stockfish11 and Komodo11.01 agree this position is better for White, their evaluations averaging as a score for Tal of +44.5

Game Two
Tigran V Petrosian - Mikhail Tal
QGD Semi-Tarrasch
1.d4 Nf6 2.c4 e6 3.Nf3
Petrosian narrowly preferred the text to 3.Nc3 by 118 games to 106.
3...d5 4.Nc3 c5!?
An aggressive response, much in Tal's style.
5.e3!?
The main move is 5.cxd5, which Petrosian played less often but with which he scored much better.
5...Nc6 6.cxd5 Nxd5 7.Bc4 cxd4 8.exd4 Be7 9.0-0 0-0 10.Re1 Nxc3
This position does not appear in Petrosian's games
The engines prefer White, but their averaged evaluations give Petrosian a score of +36, which is not enough to overcome Tal's +44.5 from game one.
Here is the updated bracket after two matches.

Round of 16               Quarter-Finals
1. Steinitz
v----------------------------Carlsen
16. Carlsen (+102.5)

8.Tal (+8.5)
v----------------------------Tal
9.Petrosian

6. Botvinnik
v--------------------------
11. Fischer

13. Kasparov
v--------------------------
4. Alekhine

3. Capablanca
v--------------------------
14. Kramnik

5. Euwe
v--------------------------
12. Karpov

7. Smyslov
v--------------------------
10. Spassky

15. Anand
v--------------------------
2. Lasker

Carlsen against Tal should make for an interesting first quarter-final.

Friday, 31 July 2020

Champion Repertoire (part eight)

A REPERTOIRE based on the games of Mikhail Tal, who was world champion from 1960-61, will suit attacking players who love studying sharp mainline theory.
White
Start with 1.e4, aiming to play open lines of the Sicilian: 1...c5.
After 2.Nf3 d6 3.d4 exd4 4.Nxd4 Nf6 5.Nc3, Tal scored 74% against 5...a6 with 6.Bg5, 79% against 5...Nc6 with 6.Bg5, 81% against 5...e6 with 6.Be2 and 72% against 5...g6 with 6.Be3.
Against 2...Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5 he scored 71% with 6.Ndb5 d6 7.Bg5.
Against 2...e6 3.d4 cxd4 4.Nxd4 a6 he scored 74% with 5.Nc3, and against 4...Nc6 he scored 69% with 5.Nc3, rising to 83% when he met 5...Qc7 with 6.Be3.
He was happy going down the main line of the Spanish: 1...e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3, usually meeting 7...d6 with 8.c3 0-0 9.h3 and 7...0-0 with 8.c3 d6 9.h3, scoring 68%.
He met the Marshall Attack: 7...0-0 8.c3 d5 with the main line 9.exd5 Nxd5 10.Nxe5 Nxe5 11.Rxe5, but after 11...c6 he played both 12.d4 Bd6 13.Re1 Qh4 14.g3, scoring 67%, and 12.Bxd5 cxd5 13.d4 Bd6 14.Re3, scoring 63%.
In the main line of the Open Defence: 5...Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 he scored 64% with 9.c3.
Against the Steinitz Deferred: 4...d6 Tal scored 85% with 5.0-0.
Against the Berlin: 3...Nf6 he scored 72% with 4.0-0, happily entering the main line of what is now known as the Berlin Wall: 4...Nxe4 5.d4 Nd6 6.Bxc6 dxc6 7.dxe5 Nxf5 8.Qxd8+ Kxd8 9.Nc3. Tal's opponents more often played 5...Be7, against which he had disappointing results the five times he played the main move 6.Qe2, scoring just 50% in ChessBase's 2020 Mega database, but scoring a win and a draw when he refined this with the line 6.dxe5 0-0 7.Qe2.
Tal met other third moves in the Spanish too infrequently to give a repertoire recommendation.
Against the Petrov: 2...Nf6 he scored 64% with the main line 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3.
Tal met the Philidor: 2...d6 three times, scoring two wins and a draw with 3.d4.
Against the French: 1...e6 2.d4 d5 he played the Tarrasch: 3.Nd2 marginally more often than the Winawer: 3.Nc3.
The vast majority of Tal's opponents replied to 3.Nd2 with 3...c5, when Tal scored 73% with 4.Ngf3.
The main reply to this in his games was 4...Nc6, when he scored 79% in the seven games he played 5.Bb5 and in the seven when he played 5.exd5.
Today 4...cxd4 is probably more popular. Tal always played the main line, 5.exd5 Qxd5 6.Bc4 Qd6 7.0-0 Nf6 8.Nb3 Nc6 9.Nbxd4 Nxd4 10.Nxd4, although he only scored 50% with it, albeit against top-class opposition.
Against 3...Nf6 Tal scored 92% with 4.e5 Nfd7 5.c3 c5 6.Bd3 (White's last two moves were often reversed) Nc6 7.Ne2.
Tal met other third moves in the French Tarrasch too infrequently to give a repertoire recommendation.
Against the Caro-Kann: 1...c6 Tal scored a stupendous 95% with 2.c4!? Most opponents replied 2...d5, against which he usually transposed into a Panov Attack with 3.exd5 cxd5 4.d4 Nf6, scoring 71% with 5.Nc3. A handful of opponents replied 2...e5, which Tal beat whether he continued 3.d4!? or 3.Nf3.
Against the Pirc: 1...d6 2.d4 Nf6 3.Nc3 g6 Tal scored 88% with the Austrian Attack: 4.f4 Bg7 5.Nf3.
Against Alekhine's Defence 1...Nf6 he generally went for a modest centre with 2.e5 Nd5 3.d4 d6 4.Nf3, scoring 63%.
Tal rarely faced the Scandinavian: 1...d5, but on two of the three times he reached the position after 2.exd5 Nf6 3.d4 Nxd5 he preferred what is now the fashionable 4.Nf3!? to the main move 4.c4.
Black v 1.e4
Aim for a Sicilian Najdorf: 1...c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6, with which Tal scored 65%.
Against 6.Bg5 Tal's most-common response was 6...e6 7.f4 Qb6, when White usually sacrifices a pawn with 8.Qd2 Qxb2, or plays 8.Nb3 and castles long. Either way, both players need to know a fair bit of theory.
Against 6.Be2 Tal scored 62% with 6...e5, usually continuing 7.Nb3 Be7 8.0-0 0-0.
Against 6.Bc4 he scored 70% with 6...e6 7.Bb3 b5.
Against 6.f4 he liked 6...e6, meeting today's favourite, 7.Qf3, with 7...Qb6 8.Nb3 Qc7.
The moves 6.Be3 and 6.g3 were rare birds in Tal's day but, as against 6.f4, he preferred 6...e6 to the 'Najdorf move' 6...e5.
Tal faced 6.a4 twice, winning both times with 6...Nc6.
He usually met 4.Qxd4 with an immediate 4...Nc6, and he scored 77% by meeting 3.Bb5+ with 3...Bd7.
Against 2.Nc3 Tal scored 78% with 2...Nc6, meeting both 3.g3 and 3.f4 with 3...g6.
He varied his replies against 2.c3 but scored an impressive 75% with 2...d5.
Black v 1.d4 and Others
After 1...Nf6 2.c4 e6 3.Nc3 Tal scored just 49% with his most-common choice 3...Bb4 but 65% with 3...c5. The latter games usually continued 4.d5 exd5 5.cxd5 d6, a position Tal often reached via the move-order 2...c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6.
Tal twice faced the main line 6.e4 g6 7.f4 Bg7 8.Bb5+, scoring a win and a draw with 8...Nfd7.
Much more popular in his games was 7.Nf3, a position often reached via the move-order 6.Nf3 g6 7.e4. After the main continuation, 7...g6 8.Be2 0-0 9.0-0 Re8 10.Nd2, Tal scored 78% with 10...Na6.
Against 3.Nf3 Tal scored just 51% with his most-common choice 3...d5 but 70% with 3...c5.
In the main line after the latter, 4.d5 exd5 5.cxd5, Tal scored 75% with the slightly unusual 5...g6 6.Nc3 Bg7. It was only after 7.e4 that he at last played 7...d6, transposing to a position I have already covered.
There seems no good way for White to exploit the delay in playing ...d6 - none of Tal's opponents pushed the d pawn to d6presumably fearing the pawn would be weak in the long run - so perhaps the main effect of delaying ...d6 is to gain time on the clock.
Against 3.g3 Tal scored 75% with 3...c5, rising to 80% in the main line 4.d5 exd5 5.cxd5 d6. If White declined to push the pawn, instead opting for 4.Nf3 cxd4 5.Nxd4, Tal scored 70% by taking over the centre with 5...d5 6.Bg2 (6.cxd5?! Qxd5) e5.
Against 2.Nf3 Tal scored 68% with the immediate 2...c5.
He only faced the Trompowsky 2.Bg5 three times, winning both games in which he replied 2...e6.
Against the English: 1.c4 Tal scored best (64%) with 1...e5. All his opponents continued 2.Nc3, which Tal usually met with 2...Nf6, scoring 67% with 3,g3 Bb4 and 87% with 3.Nf3 d6.
Against 1.Nf3 Tal usually replied 1...Nf6, scoring 63% with 2.c4 c5 and 89% with 2.g3 g6 3.Bg2 Bg7.

Tal won the 1959 Candidates' Tournament in large part thanks to beating Bobby Fischer in all four of their games. Here is the shortest.
Fischer - Tal
Candidates' (Yugoslavia) 1959, Round 13
Sicilian Sozin
1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bc4
White has a big choice at move six, but the text was very much a Fischer speciality.
6...e6 7.Bb3
This may well look strange to anyone not au fait with the Sozin Variation but it is the main move, the point being to stop ...b5 coming with tempo.
7...Be7
Fourteen(!) rounds later Tal against the same opponent preferred 7...b5.
8.f4 0-0 9.f3 Qc7 10.0-0
Both players will probably have known a game played the previous year, Khana Muchnik - Lev Polugaevsky, USSR Championship Semi-Final (Baku), that was agreed drawn after 10.f5 Nc6 11.Be3 Nxd4 12.Bxd4 b5 13.0-0-0 b4 14.Na4 Rb8 15.fxe6 fxe6.
10...b5 11.f5!?
This may be premature. The analysis engines Stockfish11 and Komodo11.01 reckon White should take time out to counter Black's queenside expansion by playing 11.a3!?, but that seems slow.
11...b4 12.Na4
How should Black proceed?
*****
*****
*****
*****
*****
12...e5!
This opens the b3-f7 diagonal but gains a bigger foothold in the centre and stops White opening the f file.
13.Ne2 Bb7 14.Ng3 Nbd7 15.Be3 Bc6 16.Bf2
Preparing a defence of e4.
16.Qb7 17.Rfe1 d5
An old rule-of-thumb has it that when Black can successfully play ...d5 in the Sicilian he has at least equalised. Certainly the engines reckon Black is much better.
18.exd5 Nxd5 19.Ne4 Nf4 20.c4 g6 21.fxg6 f5!?
Also strong is the simple 21...hxg6.
22.g7
22.gxh7+ Kh8.
22...Kxg7 23.Qg3+ Kh8 24.Nec5 Nxc5 25.Bxc5 Bxc5+ 26.Nxc5 Qc7
The smoke has cleared and material is level, but White is busted. Black's minor pieces are more active than White's and the apparent weakness of the black king is illusory.
27.Qe3 Rae8!
This is much stronger than 27...Nxg2?! 28.Qxe5+ Qxe5 29.Rxe5.
28.Re2
This is tantamount to resigning but hopeless for White is 28.g3 Nh3+ 29.Kf1 f4.
The game finished:
28...Nxe2+ 29.Qxe2 Bxg2 30.Nxa6 Qa7+ 31.Kxg2 Rg8+ 32.Kh3 Qg7 33.Bd1 Re6 0-1

Sunday, 5 April 2020

New Spice

NONE of us has much idea when normal over-the-board chess activities will resume.
Some people are trying to make up for this by playing online more, but it is not the same thing.
A lot of players will, I am sure, be using their enforced absence from the board as an opportunity to spruce-up opening repertoires.
Now is a good time to remove some of the stodge and try to inject new spice into our favourite lines.
On the other hand, if we have managed to last this long without theory-laden sharp lines, why change now?
As a compromise, I am planning to put forward a number of sharp lines, often gambits, but lines which, while respectable, do not require memorising loads of theory.
For example, after 1.e4 e5 it is all-too-easy to suggest 2.f4. That would certainly add spice to most repertoires, but it requires a detailed theoretical knowledge.
Similarly, after 1.e4 e5 2.Nf3 Nc6 it is a simple matter to suggest continuing 3.d4 exd4 4.Bc4 - the Scotch Gambit.
But the Scotch Gambit has been deeply analysed for literally hundreds of years.
So instead, in part one of this series, I am starting with the Göring Gambit: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.c3!?
It is named after German master Carl Göring, although authors vary as to why, with some saying he introduced the line into master play, although the date of this varies.
In fact the gambit was played back in the 1840s by Howard Staunton, whose lead was followed in the 1850s by Alexander Meek and in the 1860s by Louis Paulsen and Albert Merian.
Other masters also experimented with it before the first known outings, largely unsuccessful, in the 1870s by Göring.
Be that as it may, the gambit's heyday came, long after those masters were dead, in the late 1950s and 1960s when it notched wins for the likes of Tal, Gufeld, Velimirović, Ribli, Ljubojević and, in Britain, Penrose and Levy.
The commonest response to the gambit is to accept with 4...dxc3, but Black's best results percentage-wise in ChessBase's 2020 Mega database come when it is declined with 4...d5.
I will also cover the two other main ways of declining the gambit, namely 4...d3 and 4...Nf6.
A) 4...dxc3
When George Botterill wrote Open Gambits (Batsford 1986), he felt obliged to admit he could not describe the Göring as "playable."
That verdict was effectively echoed by Larry Kaufman in The Chess Advantage In Black And White (McKay Chess Library, 2004), who recommended Black accepts the gambit as it "does not give White enough lead in development to fully offset the pawn sacrificed."
But then along came an even stronger author, Viktor Bologan, who in Bologan's Black Weapons In The Open Games (New In Chess, 2014) said he wanted to recommend acceptance but had found a sideline where he "wasn't able to find any advantage for Black."
After 4...dxc3, White can offer a second pawn with 5.Bc4!?, but I want to look at what I think can be called the main line, 5.Nxc3.
Position after 5.Nxc3
In some ways the position reminds me of the Morra Gambit in the Sicilian, except that in the diagram Black has a pawn on c7 instead of e7.
For White this is both good news (Black has less central influence) and bad news (Black is not so far behind in development, as he has opened a diagonal for his dark-square bishop).
From this it can be argued that the Morra is better than the Göring for White in the short term, but White's prospects in the long term are better in the Göring.
Jacob Yuchtman - Mikhail Tal
USSR Championship (Tbilisi) 1959
5...Bb4
Theoreticians are unanimous, as far as I can discover, in recommending this continuation for Black. Indeed Kaufman gives it in The Chess Advantage without comment.
The main alternative is 5...d6, after which 6.Bc4 is obvious and good, and the main line continues 6...Nf6 7.Qb3 Qd7! (7...Qe7 8.0-0 is embarrassing for Black in that the analysis engines Stockfish10 and Komodo10 reckon best now is 8...Qd7).
After 7...Qd7!, Whites overwhelmingly play 8.Ng5, but I am putting forward the calmer choice of the engines, namely 8.Qc2!?
This was played in a game in 2000 by German teenager Leonid Kritz - then a 'mere' 2424, but three years later a grandmaster.
The idea is that White does not need to rush matters. He has four development tempi - the knights, the queen and the light-square bishop - and has more space.
Black effectively only has two development tempi in that, while he has developed three pieces, it will take him an extra tempo to develop his light-square bishop as the c8-h3 diagonal is blocked by the black queen.
So 8.Qc2!? supports the e pawn and takes the string away from ...Na5, which would be an effective answer to 8.0-0.
A natural continuation after 8.Qc2!? is 8...Be7 9.0-0 (Kritz played 9.Bf4?! in his 2000 game and only drew) 0-0 10.Rd1!?, when the engines reckon Black's best is 10...Qe8!?, after which White's compensation is clear for all to see.
6.Bc4 d6 7.0-0
7.Ng5!? is little-played but liked by the engines at least as much as the text.
7...Bxc3
Black usually captures on c3 as soon as the knight is unpinned. Indeed Kaufman reckons Black's most precise move-order is 6...Bxc3+!? 7.bxc3 d6 so as to avoid White playing 7.Qb3, instead of 7.0-0, the idea being to meet ...Bxc3 with Qxc3.
8.bxc3 Nf6
The game reached this position by a different move-order: 1.e4 e5 2.d4 exd4 3.c3 dxc3 4.Nxc3 Nc6 5.Nf3 Bb4 6.Bc4 Nf6 7.0-0 Bxc3 8.bxc3 d6.
Botterill recommended 8...Bg4 9.Qb3 Bxf3 10.Bxf7+ Kf8 11.gxf3 Ne5 12.Bxg8 (Stockfish10 prefers 12.Bd5!?) Rxg8 13.f4 Nf3+ 14.Kg2 Nh4+ 15.Kh1 Qd7. This is a long line but, as Botterill points out, is largely forced. Known continuations are 16.f5 and 16.c4, both aimed at keeping the black queen out of h3. But the engines reckon White can ignore this threat by playing 16.f3!! The point is that 16...Qh3 is met by 17.Rf2, eg 17...b6 18.Qd5 Re8 19.Qh5 h6 20.c4 with a winning attack against the black king. For that reason, instead of 16...Qh3, the engines suggest 16...Qc6, but Black's pieces are uncoordinated, and White is winning (Stockfish10) or at least much better (Komodo10) after 17.Qe6 or 17.Bd2.
9.e5!
Alekhine played 9.Ba3 in a 1919 win over Isakov, but Penrose came unstuck with the same move against Smyslov in 1958. The text was given by Alekhine as an improvement.
9...dxe5
Kaufman recommended 9...Nxe5 10.Nxe5 dxe5, after which the engines reckon best play is 11.Qxd8+ (Kaufman only covers 11.Qb3) Kxd8 12.Bxf7 Kxe7 13.Bb3 Be6 14.c4, as seen in Yuchtman - Semyon Furman, also in the 1959 USSR Championship, but eight rounds later. The position is unclear (Stockfish10 likes Black, but Komodo10 thinks the position is equal). In the game, White's bishop-pair and Black's somewhat-exposed king helped lead to a quick draw, although both sides could easily have played on.
10.Ng5 0-0!?
Black is two pawns up, so Tal offers the exchange to get his king to safety.
11.Ba3 Qxd1 12.Raxd1 Bf5
Not 12...Rd8? 13.Bxf7+ Kh8 14.Bb3 Re8 (best) 15.Nf7+ Kg8 16.Nd6+ etc.
13.Bxf8 Rxf8 14.Rfe1 h6 15.Nf3 Bg4 16.Rb1
The engines give 16.Bb5!? e4 17.Bxc6 bxc6 18.h3 Bh5 19.g4 Bxg4 20.hxg4 exf3 21.Rd3 Nxg4 22.Rxf3 with advantage to White, even though Black has three pawns for the exchange.
16...e4 17.Nd4 Ne5 18.Bf1 c5 19.Nb5 c4?!
The engines reckon White is only slightly better after 19...Rd8.
20.f3 Bxf3!?
Tal must have planned this combination as 20...Be6?! 21.fxe4 leaves White much better.
21.gxf3 Nxf3+ 22.Kf2 Ng4+ 23.Kg3 Nxe1 24.Rxe1 f5 25.Bxc4+
White has emerged from the complications with a bishop for three pawns. The position is unclear, but the engines prefer White.
25...Kh7 26.Be2 Ne5 27.Kf4 Ng6+ 28.Ke3 f4+ 29.Kd4
29.Kxe4?! f3 30.Nxa7 (any bishop move loses the rook) fxe2 31.Rxe2 is at best equal for White.
29...Kh8?
Tal was presumably worried about a possible pin on his knight after later pushing the e pawn, but correct is a move such as 29...Nh4, with equal chances according to the engines. The text is a mistake because it gives the white rook a tempo to get out of the potential skewer on the e file.
30.Rg1 Nh4 31.Kxe4 Re8+ 32.Kd3
Now Black only has two pawns for the bishop, and only one is a passer (1-0, 40 moves).
(To be continued)