A blog for members of the Kenilworth Chess Club.
Saturday, January 30, 2010
One last before we consign Zurich 1953 back to history...
White to move....any predictable course of moves would have Black win the d5-pawn, arrange to push his own pawn to d4, and start making dinner plans.
When a loss appears inevitable, reject the assumption! Black must recalibrate to a new
position and new strategy.
22. .... Rxa1
23. bxc5 dxc5
24. Bxc5 Rd8 (Black may be hanging on to his dark-squared bishop too long - now ...Bxc3 and ... Qxd5 may be enough to bring it home)
25. d6 Ne8
26. Kg2 Bf8
27. N1e2 Nxd6
28. Qd5 Nb7
29. Qxf7+ Kxf7
30. Bxf8 Rxf8
31. Ng3 Nd6
32. Rd2 Ke6
33. Rd5 Rb8
All foreshadowing aside, all seems to be going to plan... soon the b-pawn will fall and Black will roll up White's position.
Bronstein: ...but as the Eastern proverb has it: "If it weren't for the wolves, our goat could make it to Mecca." But now to howling wolves appear, in the form of a pair of white knights...
Again, reject the assumption! A second exchange tossed to the fire.
34. ...... Kxd6
35. Nxf5+ Kc6
36. Nxe4 Rxb2+
37. Kf3 Rb4
38. Nfg3 Raa4
Black is fortunate that he realizes in time that he can only, and must play for a draw.
39. ..... Ra3+
40. Kg4 Kd7
41. g6 hxg6
42. hxg6 Ke7
43. Nf5+ Ke6
44. Ng7+ Ke7
45. Nf5+ Ke6
46. g7 Ra8
47. Neg3 Rg8
48. Nh5 Rxf4+!
49. Kxf4 Rxg7!
Bronstein: This game might better belong in an adventure magazine than a tournament book.
And a possibly anachronistic story, consume with caution:
'As we can see, instead of simply offering a draw Najdorf decided to end the game with the joke moves given above, and after Kotov took the second rook he said "draw".
Kotov then looked up at Najdorf with a puzzled expression: "why?"
"Because it's a book draw."
"Ah yes," responded Kotov "that used to be true". He then went on to explain to a horrified Najdorf about the old man in Tbilisi who had recently solved the problem about how to to mate the lone king with two knights. It took a few seconds before it dawned on Najdorf that Russians know how to tell jokes too.'
Nimzovich: And so I close my book and bid a friendly, I hope, farewell to you, my readers.
Thursday, January 28, 2010
#19 Kotov-Gligoric (click here to view on chessgames.com)
Perhaps my favorite game in the whole tournament - one can only admire its artistry. Gligoric plays out a complex blockading strategy that I think would have shocked and impressed Nimzovich himself.
An odd side note - of my 20 favorite games of this tournament, the most represented players were Kotov (5 games) and Gligoric (5 games), including both games they played against each other. Despite the lack of significance this late game had to the standings of this long tournament, these two came to play, as they did for all 30 rounds.
Black to move and deal with that unpleasant b1-h7 diagonal...
11. .... e4! Blockade! (e4) Clearance! (e5)
12. fxe4 f4
13. Bf2 Nd7
Bronstein: The black knight wants to get to e5, and White has to get it out of there at any cost, which explains his knight's retreat to its original square.
14. Ng1 Qg5
15. Bf1 Ne5
16. Nf3 Qe7
17. Nxe5 Qxe5
18. O-O-O Nf6
19. h3 Bd7
Black is hewing to a dark-squared blockade on the kingside which White must break, otherwise Black's attack on the queenside will prevail. Who will win?
20. Bd3 a6
The knight threatens to jump to f3, breaking the blockade by supporting an inevitable e4-e5.
21. .... f3!!
And now the exclamation point - if the white knight wants to get to f3, Black prevents this and maintains the blockade, even at the cost of another pawn!
22. gxf3 Nh5
23. Nd2 Nf4
Bronstein: A classic example of a blockaded position. The blockade's immediate effect embraces four white pawns, but its influence penetrates much deeper: the lightsquare bishop has been turned into a pawn, the knight's own pawns occupy all of its best squares, and even so mobile a piece as White's queen is almost totally blockaded as well.
24. Bf1 b5
25. h4 Kh8
26. Rg1 Bf6
27. Nb3 Rb8? (slowing the pace of attack - Bronstein recommends ...b4 and perhaps ...bxc is a thought)
28. Be1 b4
29. Kb1 Ra8
30. Bg3 Rg8 (White aims at the base of the blockade, but Black has a tactical response)
31. .... Rxg3!
32. Rxg3 Ne2
33. Qxe2 Qxg3
34. Nc1 a5
35. Nd3 Bd4
36. h5 Qh4
White is still two pawns up, but his light-squared bishop is not a match for its opposite number, so Black can still maintain by mixing the continued dark-squared blockade with queenside counterplay.
37. Bg2 Rg8
38. Rh1 Qg3
39. Bf1 a4
40. Kc2 a3
A symmetrical blockade, now spanning both sides of the board. With no prospect to improve either position, a draw was agreed, a fitting credit to both players.
Tuesday, January 26, 2010
Tears of a Clown
#18 Reshevsky-Geller (click here to view on chessgames.com)
Before there was Fischer, there was Reshevsky, the first American to threaten the Soviet machine. The 1953 Candidates tournament was as close as he came to a world championship match, and indeed how close he came. This game was as important as Keres-Smyslov in determining the final standings. An endgame approached, and Reshevsky had every reason for optimism...
31. b6 Rb8?
Bronstein gives the amazing 31. ... Rxa3! 32. b7 Rb4 33. Rd8+ Kh7 34. b8=Q Rxb8 35. Rxb8 Rd3 36. Rf1 Rc3! with a likely drawn 4v3 rook endgame. Tragically easy for us humans to miss...
Analysis diagram after 36. .... Rc3!
Instead the game heads down more prosaic channels...for now.
32. Rd6 Ra4
33. Rxc2 Rxa3
34. h3 Rb3
35. Rcc6 Rb2
36. e4 h5
37. e5 h4
Bronstein: And here it might seem that nothing can save Black. Nevertheless, I would not have traded my b-pawn for the insignificant h-pawn. Couldn't White have relocated his rook along the seventh rank?
Bronstein gives 38. e6 f6 39. Rc7! Rxb6 40. R6d7 as winning, as indeed it is.
38. .... R2xb6
39. Rxb6 Rxb6
40. Rxh4 Rb1+
41. Kh2 Re1
Averbakh: Reshevsky did not conceal his surprise that Geller decided to play on. With an ironic smile he sat down at the board, ordered a cup of coffee and began slowly stirring it with his spoon. There was indeed no reason to hurry: the two extra pawns were a sure guarantee of victory.
Bronstein: In order to understand what follows, keep in mind that there are some rook endings in which two extra pawns are not enough to win...sometimes it is impossible to win the ending with rook and f- and h-pawns against rook, or rook and two connected passed pawns against rook, if the pawns can be blockaded. Geller is hoping to transpose into one of these endgames.
What follows is a series of suboptimal moves, each of which is individually insignificant but which lead collectively to a truly poor move.
42. f4 Re3
43. Rg4 Kh7
44. Rg3 Re2
45. h4 Re4
46. Rf3 f6
47. exf6 gxf6
48. Kg3?! Kg6 (48. g4!)
49. Ra3 f5
50. Ra6+ Kh5
51. Rf6?? Re3+ (51. Ra8 is still sufficient to win)
52. Kf2 Ra3 (Now the problem with Rf6 - stalemate is in the air!)
53. g3 Rf3+!! (See below for analysis of 53. Rxg5+)
Averbakh: It can be imagined with what pleasure Geller made this move, and how triumphantly he looked at his opponent. And Reshevsky? In the seconds remaining to the time control he began thinking intensively. At that moment Geller summoned a waiter, deliberately loudly ordered a glass of tea, and the unhurriedly began stirring in some sugar.
54. Ke2 Rxg3
55. Rxf5+ Kxh4
56. Kf2 Ra3
57. Rg5 Rb3
58. Rg1 Kh5
59. Ke2 Ra3
60. f5 Ra5
A tragedy for Reshevsky....but what about the simple 53. Rxg5+ Kxh4, going into a 2v0 rook endgame?
But this too is drawn! An unusual case, but with White's king cut off below the third rank, his pawns cannot advance unchallenged. If the f-pawn advances the Black king chases it, and the combination of king and rook will blockade the g-pawn. An unusual draw, requiring key conditions - connected pawns with the black king in front, an active Black rook and a mostly inactive White rook (in its worst position in front).
Try this against Fritz - it's oddly frustrating.
Monday, January 25, 2010
The Original Board on Fire
#17 Keres-Smyslov (click here to view on chessgames.com)
In the late rounds of the 1953 Candidates tournament, the outcome was still in doubt with Bronstein, Reshevsky, Keres and Smyslov all fighting for the top spot. In this game, Keres decided to play for the win at all costs. At what must have been an incredibly tense moment at the height of his career, Smyslov proved equal to the challenge.
From an equal position, Keres designs a quick attack on Black's kingside, using the superior mobility of his rooks.
16. Ne5 Nxe5
17. Rxe5 Bf6
18. Rh5 g6 (Bronstein cites the threat of 19. Rxh7! followed by Qh5+ and Rh3 as the cause for 18... g6)
19. Rch3?!? dxc4!!
A surprise rook sacrifice, equally surprisingly declined!
Bronstein: Smyslov's intuition did not deceive him: as later analysis was to show, he made the best move here....Did Smyslov reason it out, or did he simply guess, as one might do in a lottery, pulling out a winning number?
Of course the text move resulted from a deep study of the position. First of all, Black is opening his bishop's diagonal, creating the possibility of transferring that piece via e4 to f5 or g6. Secondly, the d-file is opened......and thirdly, a passed c-pawn temporarily makes its appearance; it may go to c3, closing the diagonal of the dangerous white bishop....Meanwhile, the white rook is still en prise...
What ends up being of fantastic importance is a c3-pawn push giving Black control of d4, and thereby h8, what would otherwise be a mating square. I don't have Kasparov's undoubtedly definitive analysis of this position, but Bronstein gives the following alternative if the sacrifice is accepted....
19. .... gxh5
20. Qxh5 Re8 (opening an escape for the king)
21. a4!! (closing it with a subsequent Ba3!)
Only when fed this move manually did my computer find that the position is in fact winning for White! Since some of its analysis disagrees with Bronstein's, I'll leave it out for now (see the discussion thread at chessgames.com for more, or On My Great Predecessors II), but the key recognition for White is that Black's escape can be cut off after all, justifying the rook sacrifice. It may be impossible to know how much of this Smyslov or Keres saw, but it suffices to say that Smyslov chose wisely.
20. Rxh7 c3!
21. Qc1 Qxd4
Now there is complete coverage of the kingside, and Black can start to dream of bigger things.
22. Qh6 Rfd8
23. Bc1 Bg7
24. Qg5 Qf6
25. Qg4 c2!
The threat of Black's passed pawn and White's lack of counterplay led him to resign in just another 3 moves (26. Be2 Rd4 27. f4 Rd1+ 28. Bxd1 Qd4+). A brilliant game, and a demonstration of accurate counterplay defeating a hasty attack.
Saturday, January 23, 2010
More Rook Endgames? You're Welcome
#16 Gligoric-Euwe (click here to view on chessgames.com)
Bronstein: The reader who immerses himself in this battle's fine points, who examines the techniques used here, and who familiarizes himself with the basic ideas behind this type of ending, will have made a great stride forward in positional play.
Here is a game that could have been taken straight out of Baburin's "Winning Pawn Structures" - first White gangs up on Black's IQP, tortures him with various threats, then finally trades down into a drawn 4v3 rook endgame...and proceeds to win it. It takes imagination to fool a veteran player in that situation, let's see how it's done...
10. a3 a6
Bronstein: It is Black's task to rid himself of the isolated pawn - that is, to push it to d4 and trade it off. This, however, is impossible for the moment, due to 11. Na4. The natural thing is for Black to prepare this advance with ...a7-a6 and ...Ba7. It is White's task to use these two tempi to bring out another piece to control the d4 square, intending to occupy it later on with a knight. Following this plan, one must consider 10. b3! a6 11. Na4 Ba7 12. Bb2 more logical; if then 12. ... b5 13. Rc1!, followed by 14. Nc5. The square d4 would have remained under White's control, a strategic accomplishment of no small importance.
It is far too early to talk about one side or another winning or losi
ng this game on account of the 10th move, but Bronstein's amazingly insightful comments lay out the strategic developments of the game that follow - Black is given a temporary opportunity to liquidate his IQP and get a good game; failing to do so, he must prepare a long defense.
11. b4 Bd6?! (Likely an inferior alternative to ...Ba7, giving up the fight for d4)
12. Bb2 Bg4
13. Rc1 Bc7
14. Na4 Qd6
With the d-pawn set in cement, Black turns to attack as a means of liberation, but White defends accurately, and through exchanges goes toward the theoretically advantageous IQP endgame.
15. g3 Ne4
16. Nc5 Nxc5 (With each piece exchange, the IQP weakens, and White exchanged his knight on a4 for Black's on e4, no small feat for a single move)
17. Rxc5 Rad8
18. Nd4! Bxe2
19. Qxe2 Nxd4
20. Bxd4 Bb6
21. Rd1! (The key. If say 21. R5c1 then 22. Bxd4 exd4 = )
21. .... Bxc5
22. Bxc5 Qe5
23. Bxf8 Kxf8
White now has an exceptionally favorable IQP endgame, with just heavy pieces left. His pieces will be more mobile, mixing attack on the weak d5 pawn with attack elsewhere on the board. There can be only two results, White winning or a draw....but despite all his advantages it is not clear that White can force a win yet.
24. Rd4 g6
25. b5?! axb5
26. Qxb5 Qc7
Bronstein (regarding White's 25th): ...to understand what follows, one must keep in mind that rook endings with four pawns versus three, all on one side, generally cannot be won. So if all the queenside pawns were to disappear, Black would be risking very little even if he does lose the isolate d-pawn. With this in mind, 25. b5...is not a very good move: 25. Qd2 would be more consistent, threatening 26. e4 and forcing 25. ...f5
27. Qb2 Kg8
28. Qd2 Qc5
29. a4 Qa3!
30. a5 Rc8
31. Rxd5?! Qc1+ (Bronstein suggests 31. Kg2 keeping the queens on)
32. Qxc1 Rxc1+
33. Kg2 Rb1
And indeed Black accomplishes his goal - he is about to simplify to the aforementioned 4v3 rook endgame, and can have very good expectation of a draw.
34. g4 Kg7
35. h4 b6
36. h5 bxa5
37. Rxa5 Rb2
No fool, Gligoric knows he is up against endgame theory trying to win here, so he changes the equation...with 38. .... h6! Black can exchange off two pawns and almost guarantee the draw. But Black chooses a different path, one that still leads toward the sunlight but hews closer to the precipice...
38. .... gxh5
39. Ra6! Rb3?!
40. Rh6 Ra3
Note: a full appreciation of this endgame is beyond my pay grade - Bronstein devotes 4 pages of analysis to the following 37 moves, borrowing from the work of several masters whose combined efforts indicated the possibilities for drawing that existed at several points. However, I will try to highlight a couple key moments to give a flavor of the text. On move 39, Bronstein recommends ...Re7 with the intention of ...Re6 instead, the point being the pawn endgame is drawn.
41. Kg3 Ra1
42. e4 Rg1+
43. Kf4 Rh1
44. e5 h4?
The adjourned move, and one Bronstein identifies as the key mistake - until now, the game was still drawn. Now, however, Black's lead h-pawn becomes a much easier target, and if White can win this pawn without exchanging rooks he has winning chances.
45. Kg4 Rg1+
46. Kf5 Rh1
47. Kg4 Rg1+
48. Kf5 Rh1
49. f4 h3
50. Kg4 Rg1+
51. Kf3 Rf1+
52. Kg3 Rg1+
53. Kf2 Rh1
54. Rf6 Ra1
55. Kg3 Rh1
56. Kg4 Kg8
It's worth replaying the game with the link on the top of this page to see how White cleverly uses zugzwang to force Black's king to take a step back - now he can play 57. Rh6 to win the h-pawn, because a rook trade no longer leads to a drawn pawn endgame (as it would if the king were still on g7).
57. Rh6 h2
58. Kg3 Rg1+
59. Kxh2 Rg4 (White cashes in, regaining his extra pawn - Black holds onto his rook of course)
60. Rf6 Kg7
61. Kh3 Rg1
62. Kh4 Rh1+
63. Kg4 Rg1+
64. Kf5 Rf1
65. .... Kf8
How can White progress? The Black rook ties his king to his f-pawn, preventing a winning pawn breakthrough. Gligoric finds the answer is, yet again, zugzwang.
66. Rc8+ Kg7
67. Rd8! Rf2 (forced)
68. Rd1! Rf3
69. Ke4 Rf2
70. Ke3 Ra2 (now Black's rook is forced off the f-file, and White's pawns head for the endzone)
71. f5! Rg2
72. Rd7! Rxg5
73. Kf4 Rg1
74. e6 Rf1+
75. Ke5 Re1+
76. Kd6 h5
77. Rxf7+ Kg8
A beautiful endgame, twice White gave up his pawn advantage to improve his position, and came up with a coherent plan to which he adhered perfectly.
Friday, January 22, 2010
Gary Kasparov reviews Chess Metaphors: Artificial Intelligence and the Human Mind
by Diego Rasskin-Gutman.
Gary gives a recap of his own personal history of playing chess computers and believes that these machines are far from solving our ancient game. Gary writes, “Chess is far too complex to be definitively solved with any technology we can conceive of today.” He uses one of the metaphors presented in Chess Metaphors to explain why; “Diego Rasskin-Gutman points out that a player looking eight moves ahead is already presented with as many possible games as there are stars in the galaxy.” The one thing computers presently do is give people access to a strong player and a huge database. Kids are playing chess younger and younger with the help of computers. And being able to absorb even more of it. Earlier this month Time interviewed Magnus Carlsen
who said himself that he isn’t sure if he even has an actual chess board at home! Bobby Fisher’s record of youngest GM has been broken only once in 1991. Since then the record has been broken twenty times. Gary credits computers for this.
The fight against computers have passed and machine now can easily draw or win against GMs. But what about poker? Gary questions, “Perhaps chess is the wrong game for the times…. while chess is a 100 percent information game—both players are aware of all the data all the time—and therefore directly susceptible to computing power, poker has hidden cards and variable stakes, creating critical roles for chance, bluffing, and risk management.” This is where humans have an edge. Gary has faith! “Perhaps the current trend of many chess professionals taking up the more lucrative pastime of poker is not a wholly negative one. It may not be too late for humans to relearn how to take risks in order to innovate and thereby maintain the advanced lifestyles we enjoy. And if it takes a poker-playing supercomputer to remind us that we can't enjoy the rewards without taking the risks, so be it.”
The review gets lengthy (especially on if you play chess, you must be intelligent
), but if you are interested you can read it in its entirety here
. One factoid mentioned that I never knew is the Kasparov match vs Topalov where it was “Man and Machine”. Both were allowed to use Fritz 5 and Chessbase 7.0. It is an interesting read found here
. Gary’s tactical genius could be held in check by Topalov using Fritz and the two tied the match with 3 points apiece. Enjoy!
PS Where are the keys at?!
Why Do In One Move What You Can Do In Ten?
#15 Najdorf-Averbakh (click here to view on chessgames.com)
The title line is a paraphrase from Silman's Complete Endgame Course, the idea being that when you have a lasting positional advantage in the endgame, slow maneuvering can be at least as effective as going for the quick kill - sometimes your opponent will crack under the pressure. Or, as in this case, you're just savoring the experience.
Here White has committed the positional 'sin' of allowing doubled c-pawns in the Queen's Indian. This disadvantage is offset to some extent by his strong center and open lines. The real mistake, as Bronstein points out, is allowing his queen to become the primary defender of the c4-pawn...
10. Ne5 Na5
11. Bxb7 Nxb7
12. Qa4 d6
13. Nd3 Na5
14. c5 ? Qe8 (14. e4 looks more reasonable. Averbakh steers toward an endgame...)
Bronstein: ...Here, by moves 12-15 [Averbakh] had already visualized the coming knight vs bishop endgame, and did everything possible thereafter to assure his knight of the best working conditions for its struggle against the bishop. We know the knight is strong: a) when the pawns are fixed, b) when it has points of support, and c) when the enemy pawns are on squares of the same color as his bishop.
15. Qxe8 Rfxe8
16. Rb1 Rec8
17. h4 d5
18. Bf4 f6
19. Nb4 a6
20. cxb6 cxb6
Black has crafted the sort of position that any endgame enthusiast would be willing to kill for. Bronstein's comments here are as instructive as any in the entire book:
Bronstein: White has an unenviable position - but why?
1) Above all, because his a2- and c3-pawns are clearly weaker than their opposite numbers at a6 and b6; the c-pawn especially needs constant defense;
2) White's position contains a gaping hole at c4, which Black will find perfectly fitted to his knight, and perhaps to his rook as well.
3) the darksquare bishop is passively placed - compare it to Black's!
...of course, Black cannot hold onto all the advantages his position contains, but he doesn't need them all in order to win. Shortly White eliminates his weakness at c3, but only by entering precisely the sort of endgame Averbakh has been striving for.
21. ..... Nc4
22. Be1 Bxb4! (Getting rid of White's better piece, and while alleviating the c3 weakness, allowing a direct path into the white position via the c-file)
23. cxb4 Na3! (maneuvering to allow Black's rooks into the White camp)
24. Rb3 Nb5
25. e3 Rc2
26. a4 Nd6
27. a5 b5
28. Rc3 Rc8
29. Rxc8+ Nxc8 (It already feels like White can resign, but Black takes his time and doesn't let any opportunity slip)
30. f3 Ne7 (Black could have saved two tempi by going straight to d6 instead, but what's the rush? He may have toyed with the idea of Nc6 to pressure the b- and d-pawns)
31. Bf2 Kf7
32. Rb1 Nf5
33. Kf1 Nd6 (there at last)
34. Rb3 Nc4 (now and only now his rook is free to roam and pick up pawns where possible - notice that Black never gave up the c-file to go pawn hunting and give his opponent counterplay)
35. Kg2 f5
36. Rb1 Nxe3+
37. Kg1 f4
38. gxf4 Nf5
39. Kf1 g6
40. Rb3 Ke7
41. Rb1 Kd7
More pawns were soon to drop. Najdorf did not enjoy his stay in Averbakh's sweatbox.
Wednesday, January 20, 2010
A Tale of Two Bishops
#14 Taimanov-Petrosian (click here to view on chessgames.com)
Taimanov comes up with an original plan to try to crack the Nimzo-Indian, which had served Black very well in this tournament. To free his bishops White clearly wants to play f3 and e4 (as he virtually always does in the Nimzo-Indian), at which point he would stand better because of the bishop pair and open lines. Here one crimp to that plan is the knight on c6, which White spends time to eliminate.
11. Ne5 Qc7
12. Nxc6 Qxc6
13. f3 Be6
14. Qe1 Nd7
Bronstein: In no other Nimzo-Indian was White able to get in e3-e4 so quickly and effectively, opening diagonals for both his bishops at once. The slightest misstep from Black could result in his king's falling under a powerful attack - Qh4 is already threatened.
15. .... c4?
Bronstein points out 15. .... f5! as a remedy, a difficult but necessary and indeed good move to make. In response to White's aggression Black should counter in the center and try to put his transient lead in development to use. Bronstein supports his analysis with several variations, but more importantly what is the alternative? The move played seeks to shut down lines and create a defensive wall, but surely Yaacov would cringe at the sight of the forlorn Black bishop - Black is playing a piece down already.
16. Bc2 f5
17. e5 Rf7
18. a4 a5
19. f4 b5?!
Bronstein: White has a clear plan of attack: h3, Kh2, Rg1, g4, Qg3 or Qh4....Petrosian's attempt to divert his opponent with his extra queenside pawn is understandable, but now a breach appears in his fortress.....
20. axb Qxb5
21. Ba3 Nb6 (White's 'bad' bishop is sitting pretty)
22. Qh4 Qe8
23. Rf3 Nc8
24. Ba4! Rd7 (24. ... Bd7 25. e6! Qxe6 26. Qd8+ [Bronstein]; now Petrosian tries his patent exchange sacrifice)
25. Rb1 Qd8
White is so dominant he can even sacrifice his queen here, getting rook, bishop, pawn and connected passers for his trouble.
26. .... Qxd7
27. Rg3 Na7
28. Be7 Bf7
29. Qg5 Bg6
30. h4 Nc6
31. Ba3 Nd8
32. h5 Ne6
33. Qh4 Bf7
34. h6 g6
35. Qf6 Qd8
36. Be7 Qc7
and finally the moment we've been waiting for...
37. Rxg6+! hxg6
38. h7+ Kxh7
39. Qxf7+ Ng7
40. Kf2 1-0
It's probably not so often a defensive master like Petrosian gets punk'd, but there it is.
Monday, January 18, 2010
Seek And Destroy
#13 Kotov-Boleslavsky (click here to view on chessgames.com)
After some non-optimal opening play by his opponent, Boleslavsky hears the ever-present battle cry of the King's Indian player, 'Forward!', and prepares to assault the center.
12. .... bxc4
13. Nxc4 Nxc4
14. Qxc4 Ne8
An interesting moment - Bronstein suggested 14. bxc4 followed by exchanges of heavy pieces on the b-file as the best way for White, leading to a likely draw. White maintains dynamic chances for both sides, choosing instead a pawn structure that orients White toward a center and kingside expansion. Black now has room to operate on the queenside, and he leverages this to put pressure on the center. The knight will go to c7 to put pressure on d4 and prepare ...e6 while the rook works the b-file.
15. Bb2 Nc7
16. Nd1 Rb4
17. Qc2 Bxb2
18. Nxb2 Bf5 (trying to provoke 19. e4 to gain a target to attack)
19. e4 Bd7
The battle rages in the center - Black has the d4 square under increasing control, whereas White's possibilities have to lie in a dynamic pawn break.
20. Nd3 Rd4!?
21. Re1 e5! (trying to seal control of d4)
22. dxe6 Nxe6 (re-supporting d4)
23. Rd1 Bb5
24. Nc1 Qa5 (the activity of Black's pieces is becoming critical. Though Bronstein does not comment here, the computer suggests 25. a4, turning back the tide of Black's pieces and focusing pressure on d6 with a later Ne2. Instead White tries to trade bishops, which loses time and weakens e4, which Black targets with vigor)
25. Bf1 Re8
26. Bxb5 axb5
Bronstein: The most cursory inspection of the position will show that Black's pieces hang like clouds over White's position. But how to turn this to account? Boleslavsky wants the key to the white fortress: the e-pawn.
27. Ne2 Rxd1
28. Rxd1 Ng5! (29. Rxd6 is suicide)
29. Kg2 Nxe4 (Shredder likes 29...Rxe4 much better for interesting tactical reasons: 30. h4? Qa8! 31. Kf1 Rxh4!? 32. gxh4 Qh1+ and ...Nh3 as one possibility. However, this move would have been hard to calculate, at least for me).
30. f3 Ng5
31. Rxd6 Qa8!
Bronstein: Kotov has won his pawn back, but Boleslavsky relentlessly turns to attack the next pawn on the diagonal, at f3. What happens if this pawn falls, or moves on? Behind the pawn on f3 stands the king, which Black has marked down as the next and final target of his attack.
32. Rd3 Ne6
33. Qd2 b4 (this move does so much - fixes a2 as a weakness, claims the c3 square and hems in the white knight. It leaves a backward pawn, yes, but if I can borrow Bronstein's logic from other games it seems to me that the weak c5 and a2 pawns are not equivalent - the c5 pawn can be supported by a centralized knight which itself has an excellent outpost supported by f6. The a2 pawn will need the attention of the White army).
34. Kf2 Qb8
35. Re3 Qa7
36. f4 Rd8
37. Qc2 Qd7
38. Ke1 Qd5
39. Ng1 Qd4
Black has consistently applied pressure on White's various weaknesses to force his way toward the back ranks. And as so often happens when under pressure, the tragedy of the 40th move...
40. Qe2? Qa1+
41. Kf2 Ra8
And the a-pawn falls; with the White king so exposed his position starts to collapse, though commendably White held out for another 26 moves before resigning.
What I love about this game is that, in retrospect, Black follows one plan consistently and without deviation. A few careless moves put White in a bad situation.
Saturday, January 16, 2010
Good Dog, Bad Dog, Sausages For All
#12 Stahlberg-Kotov (click here to view on chessgames.com)
In this game Stahlberg, who ended up as the 1953 Interzonal dead-ender (no shame given the company), is very close to the better side of a draw. But Kotov finds a way to swindle him, and after the game it didn't matter whether he won by way of consummate skill or blatant blind luck (just like I did the other night in the club championship).
Bronstein: ...it might seem that the maneuver ...Nd7-e5-f3+ could not be prevented. Stahlberg dissipates that illusion by means of a forcing variation.
33. Nf4 Re8
34. Ne6+ Rxe6
35. dxe Bxc3
36. exd7 Qxd7
So White has won the exchange but elects to immediately return it. This was surprising to me, but looking at possible continuations should convince us that this is a case where the bishop is no worse than a rook. Black's bishops have outstanding support points in the center, and the congestion of White's pieces combined with the exposure of his King make the exchange hard to keep. A variation I made up to try to push the pawns and get room for the rooks illustrates this: 37. Rd1 Bd4 38. Kh2 Bf7 39. f3?! Bh5 40. Qg2 exf3 41. Rxf3 Bxf3 =
37. h5 Bxe1
38. hxg6?! Bc3 (38. Rxe1 looks better to me, but Stahlberg may have been playing to win)
39. gxh7 Rh8!
Bronstein: The game is about even here, and after 40. Kg2 and 41. Rh1, the draw would have been quite obvious. But with his last move in tome-pressure, Stahlberg trustingly attacks the bishop, no doubt expecting that Black would find nothing better than 40. .... Bf6
40. Qe3? Kg6!! (A tragedy of the back rank, wherein the security of the king is worth more than a piece)
41. Rd1 Bd4
42. Qf4 Qxh7
43. Kf1 Qh1+
44. Ke2 Qh5+! (provoking 45. g4 to head to a better endgame - 45. Kf1 is met by Qf3!)
45. g4 Qxg4+
46. Qxg4+ fxg4
47. Bxe4+ Kg5
Bronstein: Here's the rub: despite the bishops of opposite color, White has a lost game. Let's see why:
1. Black's bishop is well supported, and stands very well at d4, while the same cannot be said for the bishop at e4.
2. Black's king is far more active than its white counterpart, and in fact assumes a leading role in the fight.
3. Nor are the pawns on f2 and g4 equivalent: where the pawn on f2 is weak and needs protection, the pawn on g4 stands ready to assist its pieces in their assault on the pawn on f2.
All of these advantages would lose their importance if White could just manage to get the rooks traded off, but he can't. The game's concluding phase is most instructive.
48. Rh1 Re8 (48. Bxb7? Rb8 or Rh2)
49. f3 b5!? (Black creates an entry point for his rook, and only then pushes the g-pawn)
50. Kf1 bxc4
51. bxc4 g3
52. Rh7 Rb8!
53. Bb7 Be5
Bronstein: Stahlberg...denies the black rook entry into his camp. Were it not for the passed g-pawn, that might have been enough to save the game.
54. Kg2 Kf4
55. Rf7+ Ke3 (The decisive inroad by the black king).
56. f4 Bxf4
57. Re7+ Be5
58. Rf7 a5
59. a4 Kd4
60. Bd5 Rb2+
61. Kf1 Ra2 0-1
A high-class, creative swindle.
Friday, January 15, 2010
Rook Endgames Are Drawn, Except When They're Not
# 11 Euwe-Stahlberg (click here to view on chessgames.com)
An interesting game on many levels, its analysis occupies a full five pages of Bronstein's book. Here we'll focus on the endgame, which is about as instructive as they come.
Bronstein: ....this endgame, played with a high degree of skill, certainly belongs among the best [rook endgames]. Black's task is a most difficult one: he has to cope with an outside passed pawn. He does have counterchances, however: the possibility of quickly creating a matching passed pawn on the h-file, and the fact that there is so little material left on the board. This latter circumstance sometimes allows one to trade off all his pawns, give up the rook for the last of the enemy pawns, and then force one's opponent to repay his debt in the same coin.
38. .... Kf8
39. Kg2 Ke7
40. Kf3 Kd7
41. Ke4 Ra7
42. Kd5 h5 Both sides have moved their kings toward the weak d-pawn and the crucial a-pawn. Now Black hopes to create counterplay by creating a passed pawn of his own. White moves to establish control of f5 as compensation.
43. f4 Ra6?!
Here Bronstein (echoing Euwe's own analysis) recommends starting counterplay immediately with 43. ... f6! 44. a6 g5 45. f5 h4 46. gxh gxh and then:
a) 47. Rxh4 Rxa6 48. Rh7+ Ke8 49. Ke6 d5+ 50. Kxd5 Ra5+ with a draw:
b) 47. Ke4 Kc6 48. Kf4 Kb5 49. Ra3 Rxa6 50. Rxa6 Kxa6 51. Kg4 Kb5 52. Kxh4 Kc5 with a draw:
44. e4?! f6 (Euwe points out that his natural move takes away the e4 square from his king, meaning the king is no loner 'in the square' of the black h-pawn in certain variations)
45. Ra2 g5
46. f5 h4
47. gxh gxh
Black has done his work very well, and is very close to a draw. But here he makes the most human move....
48. ..... Ra8?
Euwe exhaustively proves that the counterintuitive 48. .... Ra7! is the drawing move. Why? (Buy the book!) The short version is that the White pawn advances only to a6, and in variations where the passed pawns are 'exchanged' there is a draw, but now the pawn goes to a7, and if the white rook is on the h-file and black plays ...Rxa7 then Rh7+ will win the rook. Not easy stuff, missed by a GM at the board. But how does White win?
49. a6 Kc6
50. a7 h3 (...Kb7 takes the Black king too far from his pawns and loses)
51. Kd4 Kc7
52. Kd5 Kd7
53. Ra3 h2
54. Ra1 Re8 (and the disadvantages for Black of having allowed the pawn to a7 are clear - as above, there is the hanging threat of an eventual Rh7+ winning the rook. With Black pinned down White nicely transitions to a won 2 v 1 R+P endgame.)
55. Rh1 Re5+
56. Kd4 Ra5
57. Rxh2 Kc6 (still the 7th rank problem - with one extra tempo for Black this is a draw)
58. Rh7 Ra4+
And black resigned in a further 9 moves - the f-pawn is doomed and White's protected passer goes for the endzone.
A beautiful endgame, and one with subtlety.
Spreading the Joy of Chess
Me overlooking some students play chess at a school in NJ. My handy dandy instructional artwork in the background. Thanks to KCC for the sets!
Sent via BlackBerry from T-Mobile
Wednesday, January 13, 2010
Dead Man's Pawns
#10 Taimanov-Keres (click here to view on chessgames.com)
This game, though slightly flawed, gives us a look at some possible strategic choices when hanging pawns are on the board. (For those that want a refresher, here's parts 1
, and 3
of my primer on hanging pawns). In this situation (White to move), I would judge the position to slightly favor Black based on the following: several minor pieces are missing which favors the side without hanging pawns, Black's heavy pieces are already in position to put pressure on the pawns, and the blockade at c4 is begging to be put into place. The factors in White's favor are the slightly poor placement of Black's queen (ideally it would be fighting for control of e4/e5/f4) and his freedom of movement on the kingside which provides ground for counterattack.
Bronstein: The classic starting position for an attack against the hanging c- and d-pawns....in the event White continues passively, Black has several attacking options:
a) Nc6-a5-c4, blockading the c-pawn and pressing on the a-pawn;
b) rook maneuvers on the c- and d-files;
c) undermining the d-pawn by means of ...b6-b5, ...a7-a5, and ...b5-b4.
Black's final plan will depend quite a bit on White's counterplay: whether he settles into a bunker defense, or carries the play to the center with c3-c4 and d4-d5, or attacks the black king.
20. h3 Rc7
21. Re4!? Na5 (White is gearing for a kingside attack, Black focuses on the c-file)
22. Nd2 Qd5 (22. Ne5? Nb3 and 23....Nc5 wins the exchange)
23. Rg4 f5 (Bronstein notes the 'primitive' threats 24. Rxg7+ KxR 25. Qg3+ and Qxc7 or 24. Ne4)
The play has become more dynamic, which if nothing else is a psychological victory for White.
24. .... Rdc8
Bronstein prefers the dynamic 24. .... e5!? immediately nuking the center, with 25. Qxf5 exd as ultimately favoring Black; a better move, though surely not by much.
25. Re3 Nc4
26. Nxc4 Rxc4
27. Qd2 Qc6?! (an inaccuracy - trading the e-pawn for the c-pawn but better done by R8c6 first [Bronstein])
28. Re1 Rxc3
29. Rxe6 Qc4
30. Qf4 Rc1
Now on the defensive, Black looks for a way to simplify toward a draw - a clear sign the previous 10 moves have not been kind to him.
31. Qxf5 Qxd4
32. Rxc1 Rxc1+
33. Kh2 Qd7
Here Bronstein notes that White is for choice here because of his superior king safety - really the only differentiating factor, but under time pressure more than enough to bring a decisive result at times.
34. Qe4 Rc8
35. f4 Rf8
36. Qe5 Qd2
37. .... Qa5? Under pressure, Black goes toward a dubious rook endgame (....Rf7 was better)
38. QxQ bxQ
But White returns the favor, spending a badly needed tempo on defense, when Re5 is close to winning.
39. .... Rb8 1/2-1/2
In summary, from a slightly advantageous position against hanging pawns, Black was induced to allow weakness in his kingside through some dynamic play from White, and Black slid into an inferior position in a sharpened position. White did very well to change the nature of the game from defensive to tactical, and Black did not sense this shift in time. A good example of a possible way to handle the hanging pawns.
Sunday, January 10, 2010
They Don't Make Endgames Like They Used To
#8 Petrosian-Euwe (click here to view on chessgames.com)
In this game Petrosian gets to play his favorite positional squeeze, and to cap it off there's a classic endgame, coming from the days when you could do some homework after the fortieth move.
I was going to comment on this game, but there's almost too much to summarize...except to say buy Bronstein's book! He turns what may look like a dry maneuvering battle into an epic struggle.
Here it's Black to move. Gligoric got a little frisky in the opening and for his troubles he coughed up a pawn.
Bronstein: White has his counterchances: a queenside pawn majority and the d-file. How many similar games have been drawn because of inexact play! Smyslov, however, manages such endings with an iron hand. His plan may be divided into the following phases:
1. The immediate exchange of one rook, leaving the other to restrain White's queenside pawns and attack the c- and e-pawns.
2. Deflecting White's rook to the h-file by the threat to create an outside passed pawn and then occupying the d-file with his own rook.
3. Advancing the g-pawn to g4, undermining the e-pawn's support, which is the f3-pawn.
4. Tying up Whites pieces by attacking the e-pawn.
5. Sending his king in to pick off the weak pawns.
An example of the outstanding commentary from this book - in a game between us amateurs I'd give White good drawing chances, but watch and learn...
20. .... Rfd8
21. R1d1 RxR (Part 1 complete)
22. RxR Kf8
23. f3 Ke7
24. Kf2 h5!
25. Ke3 g5!
26. Rh2 Rd8 (and now part 2, taking over the d-file. The advantages become more obvious)
27. Rh1 g4 (Part 3)
28. fxg Nxg4+
29. Ke2 Nf6
30. Ke3 Rd4 (And now part 4, the siege of the e-pawn, begins in earnest)
31. Rf1 Ng4+
32. Ke2 Kf8! (Believe it or not, Black plans, unless better options arise, to march the king to g4 and push his pawns to the endzone; this is the start of part 5)
33. Rf3 Kg7
34. Rd3 (Not liking the sound of inevitability, White tries for a knight endgame, which unfortunately also turns out to be losing)
34. ..... Kf6
35. RxR exR
36. Nb5 Ke5
37. Nxa7 Kxe4
and White resigned in a further 4 moves, having little defense against the strength of Black's advancing pawns. What is remarkable to me about this ending is the way in which Smyslov wastes no moves shifting between plans, but rather identifies and exploits White's weaknesses with laser-like precision. Easy as 1-2-3...(4-5-....)
Saturday, January 9, 2010
Always Be Closing
#7 Najdorf-Stahlberg (click here to view the complete game at chessgames.com)
In this game Najdorf's opponent has aimed straight from the opening for a draw, exchanging pieces wherever possible. From the Black side this is always a risk as White can always hope for a small advantage from superior development. On the other hand, exploiting this transient advantage takes great skill, but this is what Najdorf demonstrates in this poppin' gem of a game.
18. Nf5 Rad8
19. Rfd1 Nc8?! (...Nd5)
20. Kf1 Rfe8
21. Ke2 Kf8
22. Rxd8 Rxd8
23. Rg1 Ne8
White has centralized his king, defending his back ranks and freeing his rook to continue the assault on g7 that he began with Nf5.
Bronstein: A curious picture. Black has absolutely no intention of playing g7-g6, even though that would relieve him of many of his later difficulties. In the succeeding phase of the game, Black saddles himself with a number of weaknesses, advancing nearly every pawn but the one he should have.
24. Rg4! Ne7
25. Nxe7 Kxe7
26. Re4+ Kf8
27. Ra4 a6
28. Rf4 f6?! (...Nf6)
29. Rh4 h6
Bronstein: An excellent move! Having done its work on the fourth rank, the rook now goes to work on the fifth, where it restricts Black's pawns to complete passivity. White begins to occupy more space by advancing his pawns and bringing up his king.
30. .... Nc7
31. f4 Ke7
32. Rc5 Rd6
33. Rc1?! b6?!
White had been steadily gaining space but Bronstein suggests 33. f5 as the necessary conclusion to this plan, and instead Black should now play 33. .... f5! in order to hold the levee.
34. f5 c5
35. f4 Rc6
36. a4 b5
37. Bc2 Ne8
38. Be4 Rc7
39. Bd5 c4
White has maneuvered his pieces to support the advance of his e-pawn.
40. e4 Nd6
41. axb axb
42. Ke3 Ra7
43. Rg1 Kf8
44. Kd4 Rc7
45. Rc1 Nb7?
A key feature of this game is that Black's position was defensible at many points, including in the current position. However, Black's ideas are now essentially passive, and this is a psychological burden to the defender. After the long maneuvering and weakening of his position, Black makes a real error. Seemingly improving the position of his knight he allows a nice combination.
46. Ra1 Nc5
47. Ra8+ Ke7
48. e5! (With the knight on d6 this would not have been possible)
48. ... Nb3+
49. Kc3 Nc1
50. Rg8 Ne2+
51. Kd2 Nxf4
52. Rxg7+ Kd8
53. exf! Rd7
54. Rxd7+ Kxd7
55. Bc6+! and Black resigned since the promotion of the lead f-pawn or loss of material can't be stopped.
Credit Najdorf's tenacity in constantly setting his opponent new problems to solve in an otherwise simple position.
Friday, January 8, 2010
When GM's play wussy chess
#6 Gligoric-Kotov (click here to view on chessgames.com)
Early in the game, Bronstein finds fault in Black's opening strategy. White has chosen a
somewhat tame variation of the Sicilian, and here Black may have had conflicting desires both to put a bishop on e6 to force (on capturing a White piece on d5) White to recapture eventually with his e4 pawn, blocking the d6 weakness; and also to expand on the queenside as in sharper opposite-side castling variations. Normally this is a reasonable approach, however by the fianchetto of his king's bishop White has already conceded to capturing on d5 with his pawn, as otherwise his bishop would be better served on c4.
Bronstein: The b7-b5-b4 push makes sense only when Black has a pawn on e6 and the knight is left without a good retreat. But here, ...b5-b4 will sent the knight to the excellent square d5, where Black will be practically forced to trade it off, extending the diagonal of the fianchettoed white king's bishop.
9. O-O Nbd7
10. a4 b4
11. Nd5 Nxd5
12. exd5 Bg4
13. Bd2 a5 (Bronstein suggested 13. a5 to prevent ...a5, fixing the b4 pawn as a target before playing Bd2)
14. c3 bxc3
15. Bxc3 Qb6
Bronstein: White has an extra queenside pawn, but making a passed pawn with it would appear to be the last thing on his mind; he wants to do only what is necessary on the queenside in order to free himself to proceed with his attack on the kingside.
16. h3 Bh5
17. Kh2 Be7
Bronstein: Gligoric should have converted his accumulated advantages into a direct attack, beginning with 18. g4, kicking back the unfortunate bishop before anything else; after 18....Bg6 19. f4 would have been considerably stronger.....this would lead to a sharp game, admittedly with some risk to White....but certainly he would also have been left with most o
f the chances.
[Bronstein suggests 18. g4 Bg6 19. f4 f6 20. f5 Bf7 21. Ng3 and perhaps O-O 22. Qf3 with 23. h4 to follow, see analysis diagram - This would have been a very committal decision and even still my computer slightly favors Black, though the momentum is clearly on White's side. It's not hard to understand why White might prefer a quieter way, though in making simple moves he loses the initiative].
Analysis diagram after 22. Qf3
18. f4 Bxe2
19. Qxe2 Bf6
Here White's best plan might be to just open the center with fxe despite his slightly exposed king, since Black's king would not be too comfortable either with a potential exchange sac on f6. Instead, White meanders a bit, as if waiting for Black to fall apart.
20. Qc4 O-O
21. Qc6 Rfd8
22. Rae1 Qb8
Bronstein: ...as soon as Black gets the chance to play ...exf, forcing the trade of the dark-squared bishops, all White's weaknesses will be laid bare.
23. Rb1 Ra7
24. Qc4 Rc8
25. Qe4 Qb3
26. fxe5 Bxe5
27. Qf5 Rf8
28. Qf2 R7a8
29. Qf5 Qxa4
Now, down a pawn and with no compensation, White tried to change the course of the game by an exchange sacrifice and lost in a further 12 moves (See link for the full game). White had built a strong position earlier and was faced with equally tempting choices of trying to attack on the kingside or creating a passed pawn on the queenside. In the end, he chose neither and accomplished nothing - 7 of the last 10 moves shown by White were with his queen, capturing nothing, taking the longest route from e2 to f5. Sometimes the hardest decision to make when playing with an advantage is to make a decision.
Monday, January 4, 2010
For all you Salt-N-Pepa fans out there, more from Zurich...
What's the one rule about a passed pawn? It must be pushed? Tell us more, Mr. Smyslov...
Here it is White to play, and in his position I would probably look for away to arrange to swap as many pieces off as possible while getting in c3-c4 and trying to capitalize on the passed pawn in the endgame. Smyslov's way is much more forcing.
16. Nd2 Be7
Bronstein: Beginning with this move, Smyslov carries out one idea with iron determination and logic: the minor pieces must clear a path for the passed pawn. The knight and pair of bishops do not defend the pawn; instead, they attack the squares directly in front of it. Seen in this light, the idea behind the move 16. Nd2 becomes clear: White intends to post this knight on c4 or e4, attacking the square d6.
17. Nc4 a5
18. Nxe5 Nxe5
19. Qxe5 Bf6
20. Qg3 c4
The queen has taken over the knight's duty of securing d6, and now White's bishop is not tempted by the pawn on c4 but rather sets its eyes on d7. Often as not a set of weak squares will be on a single color, but here White is aiming at d6, d7 and d8!
21. Ba4 Qe7
Bronstein: This is a typical Smyslov move.....White disregards his c-pawn [threatened by ...Qa3, winning the pawn] in order to secure the forced march of his d-pawn. We should like to draw the reader's attention to the placement of the White bishops, laying a crossfire in front of the pawn.
22. .... Rfd8
23. d6 Qe4
24. Re1 Qf5
25. d7 h5
26. Re8+ Kh7
The triumph of Smyslov's strategy, he now contests decisively for control of d8.
27. h4 Ra6
28. Bg5! Rxd7
Bronstein: The battle is lost. Black can no longer stand the pressure of White's pieces pushing the pawn forward to queen, and gives up the exchange. The rest is a matter of technique.
Well, for Smyslov. Click the link above to see the finish (Black resigns in 13 moves).
A very convincing conversion of the advantage of a mobile passed pawn.
Friday, January 1, 2010
All Rook Endgames are Drawn
Continuing on the top 20 of Zurich....
Here it is Black to move, and if I had the White pieces here I might be impatiently waiting for my opponent to resign. White has a ready-made passed pawn and Black's foursome of isolated doubled pawns do not make a good impression.
Bronstein: ....A further demonstration of White's possibilities is that, were it his move here, the 32. c4, followed by 33. Rc3, would leave Black in a completely hopeless predicament, with the rook on c3 simultaneously attacking the pawn on e3 and supporting its own passed pawn. Black's next move is directed against this threat.
Who would guess that White might be barely clinging on to a draw 12 moves later? Credit Gligoric's resourcefulness....
31. .... Re4
32. c3 Kg7
33. Kc2 R4e5
34. g4? h5
Amazingly, a key mistake has already been made, and Black sees a path out of the woods.
35. Rd6 hxg4
36. hxg4 Kh6!
Bronstein: ...but the black king refuses to be tied down! Black is giving up both his f-pawns in order to reach the square f3, which will secure him the draw. Might this possibility have been prevented? Yes; the mistake was 34. g4, by which White transferred the base of his pawn chain from g2 to g4 - i.e., closer to Black's king.
Bronstein goes on to point out a possible winning line for White after 34. g3! which I would summarize as a general concept - White should willingly part with his own f-pawn because if Black takes it then White can take the d3-pawn after which he can start pushing his passed c-pawn with the support of his king and rooks while Black's king is cut off on the kingside. I can empathize with Boleslavsky's mistake of 34. g4 - why not simply protect the pawn, and go from a winning position to a 'really winning' position? This game should remind us to defend only those pawns that are worth defending in an endgame - the pawn count may not matter nearly so much as the activity of the pieces (though ironically White loses all his kingside pawns anyhow).
37. Rxf6+ Kg5
38. Rxf7 Kxg4
39. Rd7 Kf3 (not 39. Ra7?? when 39.... Kf3 leaves White no way to stop the passed pawn)
Bronstein: Black's king has achieved a stunning success, becoming the first to break into the enemy camp.
40. Kd3 Rxf5
41. c4 a4
Here the game was drawn after adjournment - as much as Black has accomplished he cannot win, as White can 'stand pat' and mark time by pushing his free rook along the d-file. The key for White is to resist moving the c-pawn (wouldn't this be irresistible in G/45, let alone a faster game?).
Bronstein: White must move his rook back and forth along the d-file. After 42. c5 he would lose, and most instructively. White's king must defend the rook on e2 and he pawn on c4 at the same time; the latter pawn protects the supremely important support point at d5 for the rook, thus defending the king against checks on the d-file. 42. c5 would allow Black to double his rooks on the fifth rank and drive off the white king, this: 42. ... Ree5 43. c6 Rd5+ 44. Kc4 Rc5+ 45. Kd3 Rfd5+ 46. Rxd5 Rxd5+ 47. Kc4 Rd2 and Black wins....as long as the pawn stands on c4, the king on d3, and the rook covers the d-file, White can hold the draw.
The interesting part to me was the willingness with which Black sacrificed his weak f-pawns to activate his king and secure the draw - I think this idea applies in many contexts.
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