[Event "Hungary"]
[Site "It, Budapest"]
[Date "1952.??.??"]
[Round "?"]
[White "Szabo"]
[Black "Botvinnik"]
[Result "1/2-1/2"]
[Annotator "32: Defence in General"]
[ECO "A94"]
[PlyCount "156"]
[Source "Hays Publishing"]
[SourceDate "1964.01.01"]

1. d4 e6 2. c4 f5 3. g3 Nf6 4. Bg2 Be7 5. Nf3 d5 6. O-O O-O 7. b3 c6 8. Ba3 Nbd7 9. Qc1 Ne4 10. Nbd2 Bxa3 11. Qxa3 b6 12. Rac1 Bb7 13. Rfd1 Qf6 14. cxd5 exd5 15. Ne1 $1 { In the Stonewall formation we discussed the placing of the
White Knights on f3 and d3 is the most effective way of exploiting the
weakness of the e5 squares } 15... a5 { Before mobilizing his Rooks Black must protect the a-pawn } 16. Ndf3 f4 { Black starts his counterplay at the right moment. If he had waited one more
move, White would have taken the opportunity to play Nd3, after which Black
would not have found it so easy to advance his f-pawn } 17. Nd3 fxg3 18. hxg3 Rae8 { Preventing 19. Nde5 } 19. Rc2 { Preparing to double Rooks on the
half-open c-file, after which Black will have new difficulties to face } ( 19. Nde5 Nxe5 20. dxe5 Rxe5 21. Nxe5 Qxf2+ { Black has full compenstion for the sacrificed material } 22. Kh1 Nxg3+ 23. Kh2 Rf5 24. Kh3 Rh5+ 25. Kg4 Bc8+ ) 19... Qh6 20. Qc1 { In the endgame White
could easily make use of his positional superiority; for in that case Black's
attacking chances, which to a certain extent compensate for White's advantage,
would be much reduced } 20... Qd6 21. Bh3 $1 { In to context of the struggle
for control of e5, the Black Knght on d7 is an important piece, and must be
liquidated } 21... Rf6 22. Kg2 { Forestalls an eventual Knight sacrifice on g3 } ( 22. Bxd7 Qxd7 23. Nde5 Qh3 {  } 24. -- Nxg3 ) 22... c5 { Black is playing for tactical
possibilities based on his Bishop on the long diagonal } 23. Bxd7 Qxd7 24. Nfe5 { The dangerous diagonal must be kept closed } ( 24. dxc5 bxc5 25. Nxc5 Nxc5 26. Rxc5 d4 $132 ) 24... Qd6 25. f4 $1 { Still playing logically to strengthen his support point at e5. } ( 25. f3 cxd4 26. fxe4 dxe4 { Black's Bishop becomes terribly active } ) 25... cxd4 26. Rc7 $1 { White is willing to part with the Exchange to get rid of Queens, and
thus bring Black to the very edge of the abyss } 26... Nc5 27. Rxc5 bxc5 28. Qxc5 Qxc5 { If Black refuses the exchange of Queens, White would take the
front d-pawn and then, with his powerfully placed Knight would have full
compensation for the Exchange } 29. Nxc5 Ba8 30. Rxd4 Rc8 31. Ncd3 Rc2 32. Ra4 Rxe2+ ( 32... d4+ 33. Kf2 Rh6 34. Ng4 Re6 35. Nde5 h5 36. Rxa5 { White has good winning chances } ) 33. Kf3 Rc2 34. Rxa5 Rf8 35. Ke3 d4+ $1 { Black must get the utmost activity from his pieces and he cannot permit 36.
Kd4. The d-pawn is only dead weight, which considerably reduces the scope of
the Bishop } 36. Kxd4 Rd8+ 37. Ke3 Rg2 38. g4 Rc2 { Both sides were in time pressure } 39. b4 Bd5 40. a4 Bh1 ( 40... Bg2 ) 41. Ra7 Ra2 42. b5 Ra3 43. a5 $2 { By leaving the b-pawn momentarily unprotected, White
allows Black a little counter combination which eliminates the worst danger } ( 43. b6 Bg2 44. a5 Bf1 45. b7 Bxd3 46. Ra8 Ba6+ 47. Kf2 Ra2+ 48. Kg3 Ra3+ 49. Kh4 $18 ) 43... g5 $1 44. f5 ( 44. b6 gxf4+ 45. Kxf4 Rd4+ 46. Kf5 Rda4 47. b7 Bxb7 48. Rxb7 Rxa5 $11 { Black has an easy draw } ) 44... Rd5 45. Re7 ( 45. -- Rxe5+ ( 45... Rxb5 ) ) 45... Rxb5 46. f6 $1 Rxe5+ $8 ( 46... -- 47. Re8# ) ( 46... Rb8 47. Nd7 $18 ) 47. Rxe5 Kf7 48. Rf5 Bb7 49. Kd2 Bc8 $1 50. Ne5+ Kf8 51. Rxg5 Rxa5 $1 { The climax of Black's defence. In sacrificing
the Exchange Black succeeds in annihilating his opponsnt's last pawn.
Incidentally this is the third exchange sacrifice in this game! } 52. Nd7+ ( 52. Ng6+ ) ( 52. f7 Rxe5 53. Rxe5 Bxg4 ) 52... Bxd7 53. Rxa5 Bxg4 54. Ke3 { Knowledge of the endgame, and judgement in going in for it, are vital matters
for the defender. Engame theory shows that the present position would be drawn
even without Black's h-pawn. Many a narrow escape is attributable to the
endgame knowledge of the defender } 54... Be6 55. Kf4 Bc4 56. Ra7 h5 57. Kg5 h4 58. Kxh4 Bb3 59. Kg5 Bc4 60. Rc7 Ba2 61. Rc1 Bd5 62. Kf5 Kf7 63. Ke5 Bb3 64. Rc7+ Kf8 65. Rb7 Bc4 66. Rb4 Ba2 67. Kf5 Bd5 68. Kg6 Bf7+ 69. Kg5 Bd5 70. Rh4 Bb3 71. Rh8+ Kf7 72. Rh7+ Kf8 73. f7 Ke7 74. Kg6 Bc4 75. Rg7 Bb3 76. f8=Q+ Kxf8 77. Kf6 Ke8 78. Re7+ Kd8 1/2-1/2