[Event "World-ch25 Petrosian-Spassky +4-3=17"]
[Site "Moscow"]
[Date "1966.04.11"]
[Round "1"]
[White "Spassky, Boris Vasilievich"]
[Black "Petrosian, Tigran V"]
[Result "1/2-1/2"]
[ECO "B19"]
[Annotator "Bulletin"]
[PlyCount "73"]
[EventDate "1966.04.11"]
[EventType "match"]
[EventRounds "24"]
[EventCountry "URS"]
[SourceTitle "MainBase"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "2"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. h4 h6 7. Nf3 Nd7 8. Bd3
Bxd3 9. Qxd3 Qc7 10. Bd2 e6 11. O-O-O O-O-O 12. c4 Ngf6 13. Kb1 c5 14. Bc3 cxd4
15. Nxd4 a6 $10 (15... Ne5 16. Qe2 Nxc4 $2 17. Nb5 $16) 16. Nf3 $1 Bc5 17. Qe2
Bd6 18. Ne4 Be7 $1 (18... Nxe4 19. Qxe4 Nf6 20. Qe2 Qc6 21. Rde1 Bc7 22. Nd4
$14) 19. Nxf6 (19. Rhe1 {Spassky-Matulovic, 1964}) 19... Bxf6 20. Bxf6 Nxf6 21.
Ne5 Rxd1+ 22. Rxd1 Rd8 23. Rxd8+ (23. Rc1 Rd4 24. f3 Ne4 $1 (24... Rxh4 $6 25.
c5 $1)) 23... Kxd8 24. Qd3+ Ke7 25. Qd4 h5 $1 26. a3 (26. Qf4 Qc8 27. f3 $5)
26... Nd7 $1 27. Nxd7 Qxd7 28. Qc5+ (28. Qxg7 $6 Qd3+ $1) (28. Qxd7+ Kxd7 29.
Kc2 Kd6 30. Kd3 b6 $1 31. b4 f6 $10) 28... Qd6 29. Qg5+ $2 (29. Qxh5 $2 Qd3+
30. Ka1 Qf1+ 31. Ka2 Qxc4+ 32. Kb1 Qf1+) (29. Qxd6+ $1 $10) (29. Qe3 $5) 29...
Ke8 $1 30. Qe3 Qc6 (30... Qd1+ 31. Ka2 Qg4 32. Qc5 $1 Qxg2 33. Qc8+ Ke7 34.
Qc7+ Kf6 35. Qf4+ Kg6 36. f3 $1 $10) 31. Qg3 g6 32. b3 Qe4+ 33. Kb2 e5 34. Qe3
Qxg2 35. Qxe5+ Kf8 (35... Kd7 $2 36. Qf6) 36. Qh8+ Ke7 37. Qe5+ 1/2-1/2

[Event "World-ch25 Petrosian-Spassky +4-3=17"]
[Site "Moscow"]
[Date "1966.04.13"]
[Round "2"]
[White "Petrosian, Tigran V"]
[Black "Spassky, Boris Vasilievich"]
[Result "1/2-1/2"]
[ECO "D59"]
[Annotator "Bulletin"]
[PlyCount "100"]
[EventDate "1966.04.11"]
[EventType "match"]
[EventRounds "24"]
[EventCountry "URS"]
[SourceTitle "MainBase"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "2"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. c4 e6 2. Nc3 d5 3. d4 Be7 4. Nf3 Nf6 5. Bg5 O-O 6. e3 h6 7. Bh4 b6 8. cxd5
Nxd5 9. Bxe7 Qxe7 10. Nxd5 exd5 11. Rc1 Be6 12. Qa4 c5 13. Qa3 Rc8 14. Be2 a5 (
14... Qf8 15. dxc5 bxc5 16. O-O Nd7 17. Nd2 Rab8 18. e4 d4 $10) 15. O-O Na6 $6
{[/\ ...Nb4]} (15... Kf8 $1) 16. dxc5 $14 (16. Bb5 Nb4 17. Ne5 c4 18. Qa4 $14)
16... bxc5 17. Nd4 $1 Bd7 (17... Nb4 18. Nxe6 {/\ 19.Qa4+/=}) 18. Bxa6 Rxa6 19.
Ne2 a4 $2 (19... Bb5 $1 20. Rfe1 Bxe2 21. Rxe2 d4 22. Rce1 Qd6 $14) 20. Rfd1
Qd6 21. Rd2 $1 (21. Nc3 d4 22. Ne4 Qg6 $1) 21... Be6 22. h3 Rc7 23. Nf4 c4 24.
Qxd6 Rxd6 25. Ne2 a3 $6 (25... Rb6 $1 26. Nc3 Ra7 27. Rcc2 Ra5 $1) 26. bxa3 Bf5
(26... Ra6 27. Nc3 {/\ Nb5}) (26... Ra7) 27. Nc3 Rcd7 28. Rd4 $1 Kf8 29. f3 (
29. Rcd1 $142 Bd3 30. Rd2 Ke7 31. Rb2) 29... Ke7 30. Rcd1 Be6 31. Rb1 (31. Kf2
$142 Ra6 32. a4 $16) 31... Ra6 32. a4 Kd6 33. Kf2 (33. e4 $6 Kc5 $1 34. Rbd1
Kb4 $1 $10) 33... Kc5 34. Rd2 Ra5 35. Ke2 $6 $10 (35. Rb5+ Rxb5 36. axb5 Kb4) (
35. g4 $1) 35... Bf5 $1 36. e4 (36. Rb8 Bd3+ 37. Kf2 d4 $1 $17) 36... dxe4 37.
fxe4 Rxd2+ 38. Kxd2 Bd7 $1 39. Rb7 Kc6 40. Rb8 Kc5 41. Rf8 Be6 42. Rb8 Bd7 43.
Rb7 Kc6 44. Rb2 Kc5 45. Ke3 Ra7 $1 (45... Bxa4 $2 46. Rb7 Be8 47. Rc7+ $16) 46.
Rd2 Bc6 $1 (46... Bxa4 $2 47. Rd5+ Kb4 48. Kd4 $16) 47. g4 Rb7 48. Rf2 $1 Rd7
$1 49. Rd2 (49. Rf5+ Kb4 50. Nd5+ Bxd5 51. exd5 g6 52. Re5 f6 53. Re6 Rxd5 $10)
49... Rb7 50. h4 f6 $1 1/2-1/2

[Event "World-ch25 Petrosian-Spassky +4-3=17"]
[Site "Moscow"]
[Date "1966.04.15"]
[Round "3"]
[White "Spassky, Boris Vasilievich"]
[Black "Petrosian, Tigran V"]
[Result "1/2-1/2"]
[ECO "D26"]
[Annotator "Bulletin"]
[PlyCount "86"]
[EventDate "1966.04.11"]
[EventType "match"]
[EventRounds "24"]
[EventCountry "URS"]
[SourceTitle "MainBase"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "2"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c6 2. d4 d5 3. exd5 cxd5 4. c4 Nf6 5. Nc3 e6 6. Nf3 Be7 7. cxd5 Nxd5 8.
Bc4 (8. Bd3) 8... Nf6 9. O-O O-O 10. Qe2 Nc6 11. Be3 Na5 12. Bd3 b6 13. Bg5 Bb7
14. Rad1 Rc8 15. Rfe1 h6 16. Bc1 (16. Bh4 $5 Nd5 17. Qe4 Nf6 18. Qf4) 16... Bb4
$1 17. Bd2 Bxc3 $1 $15 (17... Bxf3 $6 18. Qxf3 Qxd4 19. Nb5 $1) 18. bxc3 Qd5 $1
$10 19. Qf1 $1 (19. Bb1 $5) 19... Qxa2 20. Ne5 Nb3 21. Re2 (21. Bxh6 gxh6 22.
Re3 $40) (21. Bc4 $6 Nxd2) 21... Nxd2 (21... Qa3 $1 22. Be1 Nc1 $1) 22. Rexd2
Qd5 23. c4 Qd6 24. Qe2 Rfd8 25. h3 Nd7 26. Ng4 h5 $1 (26... Qf4 $1) 27. Ne3 (
27. Ne5 $5 g6 (27... Nxe5 $2 28. dxe5 Qc6 29. Bh7+ $1)) 27... g6 28. Ra2 Ra8
29. Qc2 Kg7 30. Be4 (30. c5 $6 Qc7) 30... Bxe4 31. Qxe4 Nf6 32. Qh4 Rd7 33.
Rad2 Rad8 34. Rd3 a6 35. Qg5 Ne4 36. Qh4 Nf6 (36... f5 $1 37. d5 (37. f3 Qg3 $1
$15) 37... e5) 37. Rb3 Qc7 $138 (37... Rc8 $5) 38. d5 Qe5 $10 (38... exd5 39.
Nf5+ gxf5 40. Qg5+ Kf8 41. Qxf6) (38... b5 $1 39. cxb5 (39. Rc1 $6 bxc4 40.
Rxc4 Qe5 $1 41. dxe6 Rd1+ $19) 39... Nxd5 40. Rf1 (40. Nxd5 Rxd5 41. Rxd5 Rxd5
$17 {/\ Rd1+}) 40... axb5 41. Rxb5 Nc3 42. Rb2 Rd4 $17) 39. Rxb6 exd5 40. Nxd5
Nxd5 41. cxd5 Rxd5 42. Qxd8 Rxd8 43. Rxd8 Qe1+ {[sealed; 44.Kh2 Qxf2 45.Rxa6
Qxf2 45.Rxa6 Qf4+ 46.Kg1=]} 1/2-1/2

[Event "World-ch25 Petrosian-Spassky +4-3=17"]
[Site "Moscow"]
[Date "1966.04.18"]
[Round "4"]
[White "Petrosian, Tigran V"]
[Black "Spassky, Boris Vasilievich"]
[Result "1/2-1/2"]
[ECO "E08"]
[Annotator "Bulletin"]
[PlyCount "87"]
[EventDate "1966.04.11"]
[EventType "match"]
[EventRounds "24"]
[EventCountry "URS"]
[SourceTitle "MainBase"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "2"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. c4 e6 2. g3 d5 3. Bg2 Nf6 4. Nf3 Be7 5. O-O O-O 6. d4 c6 7. b3 b6 8. Bb2 Bb7
9. Nc3 Nbd7 10. Qc2 Rc8 11. Rad1 b5 12. c5 (12. cxb5) 12... b4 $1 13. Na4 Ba6 (
13... a5 $5) 14. Ne1 $1 Bb5 15. Nd3 a5 16. a3 $1 bxa3 17. Bxa3 Rb8 18. Rb1 Re8
19. Nc3 Ba6 20. Rfd1 Bf8 21. e4 $1 dxe4 22. Nxe4 Bxd3 $1 $10 23. Qxd3 Nd5 24.
Rdc1 N7f6 25. Nd6 Bxd6 26. cxd6 Qd7 27. Qa6 Rec8 28. Qxa5 Ne8 $1 29. Qc5 Rb5
30. Qc4 Rbb8 (30... Nxd6 $2 31. Bxd6 Qxd6 32. Qxb5 $1 $18) 31. Qc5 Rb5 32. Qc4
h6 (32... Ra5 33. Bb4 Nxd6 34. Bxd6 Qxd6 35. b4 $14) 33. Rc2 Rbb8 34. Rbc1 Nxd6
35. Bxd6 Qxd6 36. Bxd5 (36. Qa4 $5) 36... exd5 37. Qa4 Rb6 38. Rc5 Qe6 39. b4
Rcb8 40. Rxc6 Rxc6 41. Qxc6 Qxc6 42. Rxc6 Rxb4 43. Kf1 Rxd4 44. Ke2 1/2-1/2

[Event "World-ch25 Petrosian-Spassky +4-3=17"]
[Site "Moscow"]
[Date "1966.04.20"]
[Round "5"]
[White "Spassky, Boris Vasilievich"]
[Black "Petrosian, Tigran V"]
[Result "1/2-1/2"]
[ECO "B14"]
[Annotator "Bulletin"]
[PlyCount "158"]
[EventDate "1966.04.11"]
[EventType "match"]
[EventRounds "24"]
[EventCountry "URS"]
[SourceTitle "MainBase"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "2"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c6 2. d4 d5 3. exd5 cxd5 4. c4 Nf6 5. Nc3 g6 6. Qb3 Bg7 7. cxd5 O-O 8. g3
Na6 (8... Nbd7 $5 9. Bg2 Nb6) (8... e6 9. Bg2 Nxd5 10. Nge2 Nc6 11. O-O Nb6 12.
Rd1 Qe7 $10 {Gipslis-Seleznev, 1961}) 9. Bg2 Qb6 10. Qxb6 axb6 11. Nge2 Nb4 12.
O-O Rd8 {[/\ 13...Nxd5]} 13. d6 $1 (13. Bg5 Nbxd5 14. Nxd5 Nxd5 15. Rfe1 h6 16.
Bd2 Be6 $15 {Walther-Petrosian, Zürich 1961}) 13... Rxd6 (13... exd6 14. Bg5 $1
$16) 14. Bf4 Rd7 15. Rfd1 Nbd5 (15... Nfd5 16. a3 Nxf4 17. Nxf4 Nc2 18. Rac1
Nxd4 19. Nfd5 $16) 16. Be5 $16 Bh6 $2 (16... Rd8 $5) 17. a3 e6 (17... Rd8 18.
Nxd5 Nxd5 19. Nc3 Nxc3 20. bxc3) 18. Nxd5 Nxd5 19. Rd3 Bg5 (19... f6 $2 20.
Bxd5) 20. Bxd5 $1 exd5 (20... Rxd5 21. Nc3 Rda5 22. Ne4 $16 (22. Bc7 R5a6 23.
d5 $16)) 21. h4 Bd8 22. Rc1 Re7 23. Nf4 Be6 24. Rdc3 $1 Bd7 $1 (24... Re8 25.
Nxe6 fxe6 26. Rc7 $1 $16) 25. Nxd5 Re6 26. Bc7 Kg7 27. Bxd8 Rxd8 28. Ne3 b5 29.
d5 Rb6 30. Nc2 {[>= Rb3-b4-d4+/-]} h6 $1 31. Nb4 g5 32. hxg5 hxg5 33. Kg2 Rf6
$1 34. Re3 (34. Rc7 Bg4 $1 35. R1c3 Re8) 34... Rh8 $1 35. Nd3 $1 (35. Rc7 $2
Bh3+ 36. Kg1 Bg4 37. Nd3 Rfh6 38. Rxf7+ Kg8 $1 $17) 35... Rd6 (35... Bh3+ $2
36. Kg1 Bg4 37. f4 $1 $17) 36. Ne5 Bh3+ 37. Kf3 Rxd5 38. Rc7 Be6 39. Rxb7 Rc5 {
[>= 39...Kf6!]} 40. Ra7 (40. b4 Bd5+ 41. Kg4) 40... Bd5+ {[>= 40...Rh2!]} 41.
Kg4 Rc2 {(sealed)} 42. Kxg5 Rxf2 43. Nd3 Rf3 44. Rae7 Rxe3 45. Rxe3 f6+ $1 46.
Kf4 Kf7 47. Nb4 Bc4 48. Rc3 Rh2 49. b3 Be6 50. Nd3 (50. Nc6 Bd5 (50... Ra2 51.
Nd4 Bd7 52. b4 $16) 51. Nd4 Rf2+ $1 52. Ke3 Rb2 53. Nxb5 Bxb3 $1) 50... Ra2 $1
51. Rc7+ Kg6 52. Nc5 Bf7 53. Rb7 (53. Ra7 b4 $1 54. a4 Ra3) 53... Rxa3 54. Rxb5
Ra1 55. Ne4 Rf1+ 56. Ke3 Re1+ 57. Kf3 Rf1+ 58. Ke2 Rb1 59. Nd2 Rg1 60. Kf2 Rc1
61. b4 Rc2 62. Ke3 Rc3+ 63. Kf4 Rd3 64. Nf3 (64. Ne4 Bd5 $10) 64... Bd5 65.
Nh4+ Kf7 66. Rb8 Rd4+ 67. Ke3 Re4+ 68. Kf2 Ke7 69. Ng6+ Kd7 70. Nf4 Bc6 71. Nd3
Kc7 72. Rf8 Bb5 73. Nf4 Kd7 74. Rf7+ Ke8 75. Rb7 Rxb4 76. Nd5 Rb2+ 77. Ke3 Rb3+
78. Kf4 Bc4 79. Nxf6+ Kf8 1/2-1/2

[Event "World-ch25 Petrosian-Spassky +4-3=17"]
[Site "Moscow"]
[Date "1966.04.22"]
[Round "6"]
[White "Petrosian, Tigran V"]
[Black "Spassky, Boris Vasilievich"]
[Result "1/2-1/2"]
[ECO "D41"]
[Annotator "Bulletin"]
[PlyCount "30"]
[EventDate "1966.04.11"]
[EventType "match"]
[EventRounds "24"]
[EventCountry "URS"]
[SourceTitle "MainBase"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "2"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. c4 e6 2. d4 Nf6 3. Nf3 d5 4. Nc3 c5 5. cxd5 Nxd5 6. g3 (6. e3) (6. e4) 6...
Nc6 (6... cxd4 7. Nxd5 Qxd5 8. Qxd4 Qb5 $1 (8... Qxd4 9. Nxd4 Bb4+ 10. Bd2
Bxd2+ 11. Kxd2 $14) 9. e3 Bb4+) 7. Bg2 Nxc3 (7... cxd4 8. Nxd4 Nxc3 9. bxc3
Nxd4 10. Qxd4 Be7 $10) 8. bxc3 cxd4 9. cxd4 Bb4+ 10. Bd2 Be7 (10... Bxd2+ 11.
Qxd2 $14) 11. O-O O-O (11... Nxd4 $2 12. Qa4+ Nc6 13. Ne5 Bd7 (13... Qxd2 14.
Nxc6 Bd7 15. Rad1 {and 16.Rxd7}) 14. Bxc6 bxc6 15. Qa5) 12. Rb1 $5 (12. e3 $1)
(12. Bc3 $1) 12... Nxd4 13. Nxd4 Qxd4 14. Qc2 Qc5 15. Qxc5 (15. Qa4 Bd7 16.
Qxd7 Rad8 $10) (15. Qe4 Qa3 16. Qc2 Qc5 $10) 15... Bxc5 1/2-1/2

[Event "World-ch25 Petrosian-Spassky +4-3=17"]
[Site "Moscow"]
[Date "1966.04.25"]
[Round "7"]
[White "Spassky, Boris Vasilievich"]
[Black "Petrosian, Tigran V"]
[Result "0-1"]
[ECO "D03"]
[Annotator "Bulletin"]
[PlyCount "86"]
[EventDate "1966.04.11"]
[EventType "match"]
[EventRounds "24"]
[EventCountry "URS"]
[SourceTitle "MainBase"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "2"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 e6 3. Bg5 d5 4. Nbd2 Be7 5. e3 Nbd7 6. Bd3 c5 7. c3 b6 8. O-O
Bb7 9. Ne5 (9. a4 $5) 9... Nxe5 $1 10. dxe5 Nd7 11. Bf4 (11. Bxe7 $142 Qxe7 12.
f4 O-O 13. e4 $10) 11... Qc7 (11... g5 $6 12. Bg3 h5 13. h3) 12. Nf3 (12. Qg4
$2 g5 13. Bxg5 Rg8 14. h4 h6 $19) 12... h6 $1 13. b4 g5 $1 14. Bg3 h5 (14...
cxb4 $2 15. cxb4 Bxb4 16. Nd4) 15. h4 gxh4 $1 (15... g4 16. Ne1 Nxe5 17. Bb5+
Kf8 18. bxc5 bxc5 19. Qa4 $16) 16. Bf4 (16. Nxh4 $2 c4 17. Bc2 Bxh4 18. Bxh4
Qxe5 $17) 16... O-O-O $1 17. a4 $2 (17. bxc5 $5 bxc5 18. Rb1 $13) 17... c4 $1
18. Be2 (18. Bf5 $5 {e.g. 18...} exf5 19. e6 Bd6 20. exd7+ Rxd7 21. Qd4) 18...
a6 $1 19. Kh1 Rdg8 20. Rg1 Rg4 21. Qd2 (21. Nh2 $5 Rg6 22. Nf3 Rhg8 23. Qd2)
21... Rhg8 22. a5 b5 23. Rad1 Bf8 $1 {[/\ 24...f6 25.exf6 e5]} 24. Nh2 Nxe5 $1
25. Nxg4 hxg4 26. e4 Bd6 (26... dxe4 $4 27. Bxe5 $16) 27. Qe3 Nd7 (27... g3 $5
28. f3 $1) 28. Bxd6 Qxd6 29. Rd4 $2 (29. f4 $1 f5 30. e5 Qc7) 29... e5 $1 30.
Rd2 (30. Rxd5 $5 Bxd5 31. Rd1 Nf6 32. exd5 $15) 30... f5 $1 $17 31. exd5 (31.
exf5 h3 $1 $17) (31. exf5 Nf6 $1 32. f3 Nh5 33. fxg4 Ng3+ 34. Kh2 d4 $1 $17)
31... f4 $1 32. Qe4 (32. Qa7 e4 $17) 32... Nf6 33. Qf5+ Kb8 34. f3 (34. Qe6
Qxe6 35. dxe6 Ne4 $1 $17) 34... Bc8 35. Qb1 g3 36. Re1 h3 37. Bf1 (37. gxh3 g2+
38. Kg1 Qd7 $1 $19) 37... Rh8 38. gxh3 Bxh3 39. Kg1 (39. Bxh3 Qd7 $1) 39...
Bxf1 40. Kxf1 (40. Rxf1 Qd7 {/\ 41...Qh3 or 41...Qa7+}) 40... e4 $1 41. Qd1 (
41. fxe4 f3 $1 $19) 41... Ng4 $1 42. fxg4 f3 43. Rg2 fxg2+ {[44.Kxg2 Qf4]} 0-1

[Event "World-ch25 Petrosian-Spassky +4-3=17"]
[Site "Moscow"]
[Date "1966.04.27"]
[Round "8"]
[White "Petrosian, Tigran V"]
[Black "Spassky, Boris Vasilievich"]
[Result "1/2-1/2"]
[ECO "A33"]
[Annotator "Bulletin"]
[PlyCount "46"]
[EventDate "1966.04.11"]
[EventType "match"]
[EventRounds "24"]
[EventCountry "URS"]
[SourceTitle "MainBase"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "2"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. c4 c5 2. Nf3 Nf6 3. Nc3 Nc6 4. d4 cxd4 5. Nxd4 e6 6. e3 (6. e4 Bb4 $10) 6...
Be7 (6... d5 7. cxd5 exd5 8. Be2 Bd6 $10) 7. Be2 O-O 8. O-O d6 9. b3 a6 10. Bb2
Bd7 11. Qd2 Qc7 12. Rac1 Rac8 13. Rfd1 Qb8 14. Nf3 Rfd8 $10 15. Bd3 (15. Ng5
Be8 16. Nce4 Nxe4 17. Nxe4 d5 18. cxd5 Rxd5 19. Qc3 Nd4 $1 20. Qxc8 Nxe2+ 21.
Kf1 Rxd1+ 22. Kxe2 Qxc8 23. Rxc8 Rd8 24. Rc7 Bf8 $15) 15... Be8 16. Qe2 (16. e4
Ne5 $10 {or 16...d5!=}) 16... d5 $1 17. cxd5 Nxd5 18. Nxd5 Rxd5 19. a3 (19. Qc2
h6 20. Bh7+ Kh8 21. Rxd5 exd5 22. Bf5 $16) (19. Qc2 $5 g6 20. Qc3 $1) (19. Qc2
Rc5 20. Bxh7+ Kh8 21. Qb1 $1 Rxc1 22. Rxc1 f5 23. Bxf5) (19. Qc2 Rh5 $1 20. h3
h6 {/\ 21...Rc5}) 19... Rcd8 20. Be4 Rxd1+ 21. Rxd1 Rxd1+ 22. Qxd1 Qd8 23. Qxd8
Bxd8 1/2-1/2

[Event "World-ch25 Petrosian-Spassky +4-3=17"]
[Site "Moscow"]
[Date "1966.04.29"]
[Round "9"]
[White "Spassky, Boris Vasilievich"]
[Black "Petrosian, Tigran V"]
[Result "1/2-1/2"]
[ECO "D42"]
[Annotator "Bulletin"]
[PlyCount "51"]
[EventDate "1966.04.11"]
[EventType "match"]
[EventRounds "24"]
[EventCountry "URS"]
[SourceTitle "MainBase"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "2"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c6 2. d4 d5 3. exd5 cxd5 4. c4 Nf6 5. Nc3 e6 6. Nf3 Be7 7. cxd5 Nxd5 8.
Bd3 Nc6 9. O-O O-O 10. Re1 Bf6 11. Be4 Nce7 12. Qc2 (12. Ne5 Bd7 13. Qd3 g6 14.
Bh6 Bg7 15. Bxg7 Kxg7 16. Bxd5 $1 $14) 12... g6 13. Bh6 Bg7 14. Bg5 (14. Qd2 $5
) 14... f6 $1 15. Bd2 Bd7 16. Qb3 (16. h4 Bc6 17. h5 Nf5 18. hxg6 hxg6 19. g4
Nfe7 $10) 16... Bc6 $10 17. Bxd5 (17. Re2 Qd7 $10) 17... exd5 18. Ne4 Rf7 19.
Nc5 Nf5 20. h3 Bf8 21. Ne6 Qd7 22. Nxf8 Rfxf8 23. Bb4 Rfe8 24. Rxe8+ Rxe8 25.
Re1 Rxe1+ 26. Bxe1 1/2-1/2

[Event "World-ch25 Petrosian-Spassky +4-3=17"]
[Site "Moscow"]
[Date "1966.05.02"]
[Round "10"]
[White "Petrosian, Tigran V"]
[Black "Spassky, Boris Vasilievich"]
[Result "1-0"]
[ECO "E66"]
[Annotator "ChessBase"]
[PlyCount "59"]
[EventDate "1966.04.11"]
[EventType "match"]
[EventRounds "24"]
[EventCountry "URS"]
[SourceTitle "100 Jahre Schach"]
[Source "ChessBase"]
[SourceDate "2000.04.19"]
[SourceVersion "1"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. Nf3 Nf6 2. g3 g6 3. c4 Bg7 4. Bg2 O-O 5. O-O Nc6 6. Nc3 d6 7. d4 a6 8. d5
Na5 9. Nd2 c5 10. Qc2 e5 {Die Varianten mit e5 genießen nicht den besten Ruf;
als besser gilt 10...Rb8 nebst b7-b5.} 11. b3 Ng4 12. e4 f5 13. exf5 gxf5 14.
Nd1 $5 (14. Bb2 $1 Bd7 15. Rae1 b5 16. Nd1 $14) 14... b5 15. f3 $6 (15. Bb2 Rb8
(15... f4) 16. f3 Nf6 17. Bc3 Bh6 18. Re1) 15... e4 $1 16. Bb2 exf3 17. Bxf3
Bxb2 18. Qxb2 Ne5 19. Be2 f4 $1 (19... Ra7 $5) 20. gxf4 $5 {Stellt eine Falle!}
({Ein sicherer, aber evtl. nur kleiner Vorteil ließ sich mit} 20. Rxf4 {
erzielen:} Rxf4 21. gxf4 Ng6 22. Ne4 Nxf4 {und nun sehen 23.Ndf2, 23.Ne3 und
23.Kh1 aussichtsreich aus.}) 20... Bh3 $2 {Suetin, der Sekundant von Petrosian
war, berichtet, dass dieser Zug fast ohne Nachzudenken kam.} ({Nach} 20... Rxf4
21. Ne3 Qg5+ 22. Kh1 Rxf1+ 23. Ndxf1 Ra7 $13) ({oder} 20... Ng6 {steht Schwarz
nicht schlechter.}) 21. Ne3 $1 {Petrosian galt schon damals als Meister des
Qualitätsopfers und es wäre deshalb ein großer Leichtsinn von Spassky gewesen,
hätte er diesen Zug nicht ins Auge gefasst.} Bxf1 ({Vielleicht bot} 21... Rxf4
{größere praktische Chancen.} 22. Rxf4 Qg5+ 23. Rg4 $1 Nxg4 24. Nxg4 Bxg4 25.
Bxg4 Qxg4+ 26. Kh1 Qd4 $8 27. Rg1+ Kh8 28. Qxd4+ cxd4 {"mit ein paar
Überlebenschancen im Endspiel" (Burges, Emms, Nunn)}) 22. Rxf1 Ng6 23. Bg4 Nxf4
$6 {Danach steht Weiß endgültig klar auf Gewinn.} (23... Rxf4 $6 24. Be6+ Kf8
25. Rxf4+ Nxf4 26. Qh8+ $18) (23... Qf6 $5 24. Be6+ Kh8 25. Qxf6+ Rxf6 26. f5
Ne5 27. Ne4) (23... h6 $5 {(Burges, Emms, Nunn)} 24. Be6+ Kh7 25. Qc2 {In all
diesen Varianten sollte Weiß gewinnen.}) 24. Rxf4 $1 Rxf4 25. Be6+ Rf7 26. Ne4
Qh4 27. Nxd6 Qg5+ 28. Kh1 Raa7 29. Bxf7+ Rxf7 30. Qh8+ $1 {Elegantes Finale!
Quellen: Suetin "Schachstrategie der Weltmeister" Sportverlag 1983 "The
World's Greatest Chess Games" von Burgess, Nunn und Emms, Robinson London 1998.
} 1-0

[Event "World-ch25 Petrosian-Spassky +4-3=17"]
[Site "Moscow"]
[Date "1966.05.04"]
[Round "11"]
[White "Spassky, Boris Vasilievich"]
[Black "Petrosian, Tigran V"]
[Result "1/2-1/2"]
[ECO "C10"]
[Annotator "Bulletin"]
[PlyCount "51"]
[EventDate "1966.04.11"]
[EventType "match"]
[EventRounds "24"]
[EventCountry "URS"]
[SourceTitle "MainBase"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "2"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Nd7 5. Nf3 Ngf6 6. Nxf6+ Nxf6 7. Bg5 Be7
8. Bd3 c5 9. dxc5 Qa5+ 10. c3 Qxc5 11. Qe2 Bd7 $5 (11... O-O 12. O-O-O Rd8 (
12... Bd7 $2 13. Bxf6 Bxf6 14. Bxh7+) 13. Ne5 Qc7 14. f4 {e.g.} h6 15. h4 $16)
12. Ne5 $1 Bc6 (12... Ng4 $5 13. Nxf7 $1 Kxf7 14. Bxe7 Qxf2+ 15. Qxf2+ Nxf2 16.
Kxf2 Kxe7 $14) 13. h4 $1 Rd8 (13... Bxg2 $6 14. Rg1 Bc6 15. O-O-O $1 $16) 14.
O-O-O Nd7 15. Nxc6 $5 (15. Bxe7 $1 Qxe7 16. Nxc6 bxc6 17. Be4 $14) 15... Bxg5+
16. hxg5 Qxg5+ 17. Kc2 (17. Kb1 $5) 17... bxc6 18. Rh5 $6 (18. Be4 $5 Qc5 19.
Rh5 Qb6 20. Qf3 $1 $14) 18... Qf4 19. Be4 (19. Bg6 $5 Qa4+ 20. Kc1 fxg6 21.
Qxe6+ Kf8 22. Qd6+ Kf7 23. Rh3 Rhe8) 19... Qc7 $1 20. Qc4 (20. Qg4 $5 g6 21.
Bxg6 fxg6 22. Qxe6+ Kf8 23. Rh3) (20. Qg4 Nf6 21. Qxg7 Ke7 22. Bg6 $1 $18) (20.
Qg4 Ke7 $5 21. Qxg7 Rhg8) 20... c5 21. Qb5 (21. Rxh7 Rxh7 22. Bxh7 $10 g6 $2
23. Bxg6 fxg6 24. Qxe6+ Kf8 25. Rd3 $18) 21... g6 $1 22. Rh4 (22. Rxd7 $6 Rxd7
23. Rxc5 Qd6 $17) 22... O-O (22... Ke7 23. Bc6 Ne5 24. Qxc5+ $10) 23. Qc6 $5
Qxc6 24. Bxc6 Ne5 25. Rxd8 Rxd8 26. Bb5 $1 (26. Bb5 $1 Rb8 27. a4 h5 28. Re4
Ng4 29. f3 Nf6 30. Rc4 Nd5 $1 $15) 1/2-1/2

[Event "World-ch25 Petrosian-Spassky +4-3=17"]
[Site "Moscow"]
[Date "1966.05.06"]
[Round "12"]
[White "Petrosian, Tigran V"]
[Black "Spassky, Boris Vasilievich"]
[Result "1/2-1/2"]
[ECO "A42"]
[Annotator "ChessBase/Bulletin"]
[PlyCount "77"]
[EventDate "1966.04.11"]
[EventType "match"]
[EventRounds "24"]
[EventCountry "URS"]
[SourceTitle "MainBase"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "2"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. Nf3 g6 2. c4 Bg7 3. d4 d6 4. Nc3 Nd7 5. e4 e6 6. Be2 b6 7. O-O Bb7 8. Be3
Ne7 9. Qc2 h6 10. Rad1 O-O 11. d5 $1 {Preventing 11...f5.} e5 12. Qc1 Kh7 13.
g3 f5 $6 {>=} (13... a5 $5 14. Nh4 Nc5 {and 15...Bc8}) 14. exf5 Nxf5 (14...
gxf5 15. Nh4 $1 {and 16.f4}) 15. Bd3 Bc8 16. Kg2 Nf6 17. Ne4 Nh5 $5 (17... Nxe4
18. Bxe4 Nxe3+ 19. fxe3 $1 Bg4 20. Qc2 Qe8 21. Nh4 $16) (17... Bd7) 18. Bd2 Bd7
19. Kh1 (19. g4 Nh4+ $1 20. Nxh4 Qxh4 21. gxh5 Qh3+ $1 $17) 19... Ne7 20. Nh4
$1 Bh3 (20... c6 21. f3 cxd5 22. cxd5 Rc8 23. Qb1 $16) 21. Rg1 Bd7 (21... Qd7
22. g4 $1) 22. Be3 (22. f3 $5 {/\ 23.Rfd1}) 22... Qe8 (22... Nf5 23. Nxg6 $1
Kxg6 24. g4) 23. Rde1 Qf7 24. Qc2 Kh8 25. Nd2 Nf5 26. Nxf5 $1 (26. Nxg6+ $2
Qxg6 27. g4 Nhg3+ $1 28. fxg3 Qxg4 $17) 26... gxf5 27. g4 $1 $40 e4 $5 (27...
f4 $6 28. Bg6 Qf6 29. Bxb6 (29. gxh5 fxe3 30. fxe3 e4 $1) 29... axb6 30. Be4
$16) 28. gxh5 f4 $5 {[#]} (28... exd3 29. Qxd3 Rae8 $1 30. Nf3 $16) 29. Rxg7 $3
$18 Qxg7 30. Rg1 Qe5 (30... Bg4 31. Rxg4 Qxg4 32. Bd4+ Kg8 33. Bxe4 Rf7 34. f3
Qg5 35. Bg6 Re7 36. Ne4) (30... exd3 31. Qxd3 Qxg1+ 32. Kxg1 Rg8+ 33. Kh1 $1
fxe3 34. Qxe3 Rg5 35. Ne4 $1 Re8 36. h4 Rxh5 37. Qd4+ Ree5 38. Nf6 $1 $18) 31.
Nf3 $1 {/\32.Bd4} exd3 (31... exf3 32. Bd2 Bh3 33. Bc3 Bg2+ 34. Rxg2 fxg2+ 35.
Kxg2 f3+ 36. Kf1 $18) 32. Nxe5 $2 (32. Qxd3 $142 $18 Bf5 33. Nxe5 Bxd3 34. Bd4
dxe5 (34... Be4+ 35. Nf3+ $1) 35. Bxe5+ Kh7 36. Rg7+ Kh8 37. Rxc7+ Kg8 38. Rg7+
Kh8 39. Rxa7+ Kg8 40. Rg7+ Kh8 41. Rg3+ Kh7 42. Rxd3 $18) 32... dxc2 33. Bd4 $1
$11 dxe5 34. Bxe5+ Kh7 35. Rg7+ Kh8 36. Rf7+ Kg8 37. Rg7+ Kh8 38. Rg6+ $11 (38.
Rxd7+ $11 Kg8 39. Rg7+ Kh8 40. Rxc7+ Kg8 41. Rg7+ Kh8 $10 42. Rg1+ Kh7 43. Rc1
Rae8 44. Bd4 Re2) 38... Kh7 39. Rg7+ 1/2-1/2

[Event "World-ch25 Petrosian-Spassky +4-3=17"]
[Site "Moscow"]
[Date "1966.05.11"]
[Round "13"]
[White "Spassky, Boris Vasilievich"]
[Black "Petrosian, Tigran V"]
[Result "1-0"]
[ECO "B19"]
[Annotator "Bulletin"]
[PlyCount "182"]
[EventDate "1966.04.11"]
[EventType "match"]
[EventRounds "24"]
[EventCountry "URS"]
[SourceTitle "MainBase"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "2"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. h4 h6 7. Nf3 Nd7 8. h5
Bh7 9. Bd3 Bxd3 10. Qxd3 Qc7 11. Bd2 e6 12. Qe2 $1 Ngf6 13. O-O-O O-O-O 14. Ne5
$1 Nxe5 (14... Nb6 15. Ba5 c5 16. Qb5 $14) 15. dxe5 Nd7 16. f4 $14 Be7 17. Ne4
Nc5 18. Nc3 f6 $1 (18... Rd4 19. Be3 Rxd1+ 20. Rxd1 Rd8 21. Qg4 $1 $14) (18...
Rhe8 19. g4 $1 Bf8 20. g5 $14) 19. exf6 Bxf6 20. Qc4 $1 (20. b4 $2 Bxc3 21.
Bxc3 Qxf4+ 22. Kb1 (22. Bd2 Qf6 $1 $17) 22... Ne4 23. Bxg7 Rhg8 $15) 20... Qb6
21. b4 Na6 22. Ne4 (22. Qxe6+ Kb8 23. a3 Rxd2 $1 24. Kxd2 Qd4+ $19) 22... Nc7
23. Rhe1 Rd4 {>=} (23... Be7 24. Bc3 Nd5 25. Bxg7 Bxb4) 24. Qb3 Qb5 25. c3 $1
Rxe4 $5 {[25...R 26.Nc5+/-]} 26. Rxe4 Qxh5 27. Qc4 Qf5 28. Qe2 h5 29. Be1 Re8
30. g3 a5 31. bxa5 Qxa5 32. Qc2 (32. c4 Qa3+ 33. Kb1 {/\ 34.Rd3}) 32... Qf5 33.
Ra4 g5 $6 (33... b5 $5) 34. fxg5 Bxg5+ 35. Kb1 Qxc2+ 36. Kxc2 e5 (36... b5 $5
37. Re4 Nd5) 37. Re4 Nd5 38. Bf2 Nf6 39. Ra4 Kc7 40. Bc5 Nd5 41. Re4 b6 {
(sealed)} 42. Bg1 (42. c4 bxc5 {(42...N 43.Rxe5! Rxe5 44.Bd6+)} 43. cxd5 Kd6 $1
44. Ra4 Be3 $1 45. Ra6 Bd4 46. dxc6 Rf8 $132) 42... Bd8 43. Rf1 Nf6 44. Re2 c5
45. Rf5 Kd6 46. a4 $1 Kd5 47. Kd3 Ng4 48. Rb2 (48. Rxh5 Rf8 $1) 48... Rh8 49.
a5 $1 c4+ (49... bxa5 50. Rb5 $1) 50. Ke2 Ke4 51. Rf7 bxa5 52. Rb8 a4 53. Rc8 (
53. Rd7 a3 $1) 53... Bf6 54. Rxc4+ $6 (54. Rxh8 $1 Bxh8 55. Rc7 $1 $18) 54...
Kf5 55. Ra7 (55. Rxa4 Rc8 $1 56. c4 Rb8 57. Ra2 Rb3 $132) 55... a3 (55... Rd8
$5 56. Rcxa4 Bg5 $1) 56. Rxa3 Rb8 57. Rb4 Rc8 58. c4 Be7 59. c5 e4 $1 (59...
Bxc5 $2 60. Rf3+ $1 $18) 60. Ra7 Bf6 (60... Bxc5 $4 61. Ra5) 61. Rh7 $6 (61.
Raa4 $1) 61... Kg6 62. Rd7 Kf5 63. Rd5+ Be5 64. Rb6 e3 $1 (64... Ra8 65. Bd4 $1
Ra2+ 66. Bb2 $1 Ra5 67. Bxe5 Nxe5 68. Rh6 $1 $18) 65. Kf3 (65. Bxe3 Ke4 66. Rd3
Bxg3) 65... Nf6 66. Rd3 Rxc5 67. Bxe3 Rc2 68. Rd8 Rc3 69. Ke2 Rc2+ 70. Kd1 Rc3
71. Bf2 Ne4 $2 (71... Ra3 $5) (71... Bxg3 $2 72. Bd4) (71... Ng4 $5) 72. Rf8+
Kg5 (72... Nf6 $5 73. Rfxf6+ Bxf6 74. Rxf6+ $1 Kxf6 75. Bd4+ Kg5 $1 76. Bxc3 h4
$1) (72... Kg4 $2 73. Rb4 $1) 73. Rb5 $1 Rd3+ (73... Nxf2+ 74. Rxf2 Re3 75. Re2
$1 $18) 74. Ke2 Rd5 75. Rxd5 Nc3+ 76. Kf3 Nxd5 77. Ra8 (77. Ke4 Nf6+ 78. Kxe5
$2 Nd7+) 77... Kf5 78. Ra5 Ke6 79. Be1 Nf6 80. Rb5 Nd5 81. Bd2 Bg7 82. Bc1 Be5
83. Bb2 Bc7 84. Rc5 Bd6 85. Rc1 Ne7 86. Re1+ $1 (86. Rh1 $2 Nf5 $1 87. Rh3 Nxg3
$1 $10) 86... Kf5 87. Ra1 Nc6 88. Ra6 Be5 89. Rxc6 Bxb2 90. Rc5+ Kg6 91. Kf4
Bg7 {(sealed)} 1-0

[Event "World-ch25 Petrosian-Spassky +4-3=17"]
[Site "Moscow"]
[Date "1966.05.13"]
[Round "14"]
[White "Petrosian, Tigran V"]
[Black "Spassky, Boris Vasilievich"]
[Result "1/2-1/2"]
[ECO "A05"]
[Annotator "Bulletin"]
[PlyCount "113"]
[EventDate "1966.04.11"]
[EventType "match"]
[EventRounds "24"]
[EventCountry "URS"]
[SourceTitle "MainBase"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "2"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. Nf3 Nf6 2. g3 b5 3. a4 b4 4. d3 Bb7 5. e4 d6 6. Bg2 Nbd7 7. O-O e6 8. a5 Rb8
9. Nbd2 Be7 10. Nc4 O-O 11. Re1 a6 $10 12. Bf4 Ba8 13. Qe2 Re8 14. h3 Bf8 15.
Ncd2 (15. e5 $5 dxe5 16. Nfxe5 Nxe5 17. Nxe5 Bxg2 18. Kxg2 Qd5+ $1 $10) 15...
g6 16. Bg5 h6 17. Be3 Bg7 18. Kh2 Qe7 19. Ra2 $2 (19. Ng1 $142 $5 {/\ 20.f4})
19... Kh7 20. Ng1 d5 $1 21. f4 e5 $1 22. fxe5 Qxe5 (22... Nxe5 $5 23. d4 Nc4
24. Nxc4 dxc4 25. e5 Nd5) 23. d4 (23. Bf4 Qe7 24. exd5 (24. Bxc7 $2 Rbc8 $1 $17
) 24... Qxe2 25. Rxe2 Rxe2 26. Nxe2 Nxd5 $10) 23... Qe6 24. e5 Ne4 25. Raa1 c5
$1 26. Nxe4 dxe4 27. c3 bxc3 28. bxc3 cxd4 29. cxd4 f6 30. exf6 Nxf6 31. Rab1
Nd5 32. Qd2 Rxb1 33. Rxb1 Qd6 $1 34. Ne2 Qa3 35. Bg1 Qd3 36. Qe1 $1 (36. Qxd3
$2 exd3 37. Nf4 Nc3 $1 $19) 36... Bc6 $6 {>=} (36... Rc8 {/\ 37...Rc2;} 37. Rd1
(37. Rc1 Rxc1 38. Nxc1 Qc2 (38... Qc3 39. Qxc3 Nxc3 40. Nb3 $17) 39. Ne2 e3 $17
) 37... Rc2 38. Rxd3 exd3 39. Bf3 Nc7 $1 $19 (39... Nf4 $2 40. gxf4 Bxf3 41.
Kg3 Rxe2 42. Qd1 Be4 43. h4 $1)) 37. Rd1 Qa3 (37... Bb5 $5 38. Nf4 (38. Rxd3
exd3 39. Bxd5 Rxe2+ 40. Qxe2 dxe2 41. Bf2 Bxd4 42. Be1)) 38. Nf4 $1 Nxf4 39.
gxf4 Bb5 (39... Qd6 $1) 40. Be3 Bd3 41. h4 $1 {(sealed)} Qd6 42. h5 g5 (42...
gxh5 $5 43. Qf2 Rd8 44. Bh3 $1 Bxd4 $2 45. Bf5+ Kh8 46. Bxe4 $1 $10) 43. Qg3
Bxd4 44. Bxd4 (44. Bxe4+ $6 Rxe4 45. Rxd3 Rxe3 $1 46. Rxe3 (46. Qxe3 $2 Bxe3
47. Rxd6 Bxf4+ $19) 46... Bxe3 47. Qxe3 gxf4 $15) 44... Qxd4 45. fxg5 Qe5 (
45... Qc5 46. Qf4 $1) 46. Qxe5 Rxe5 47. gxh6 Rxa5 (47... e3 48. Bf3 e2 49. Re1
Rxa5 50. Kg3 Ra2 51. Kf2 a5 52. Ke3 $1 $10) 48. Kg3 Rg5+ 49. Kf2 a5 50. Ra1
Kxh6 51. Bh1 Rxh5 52. Ke3 Bc2 53. Rc1 Rh3+ 54. Kd4 a4 55. Bxe4 Bxe4 56. Kxe4 a3
57. Kd4 1/2-1/2

[Event "World-ch25 Petrosian-Spassky +4-3=17"]
[Site "Moscow"]
[Date "1966.05.16"]
[Round "15"]
[White "Spassky, Boris Vasilievich"]
[Black "Petrosian, Tigran V"]
[Result "1/2-1/2"]
[ECO "B25"]
[Annotator "Bulletin"]
[PlyCount "110"]
[EventDate "1966.04.11"]
[EventType "match"]
[EventRounds "24"]
[EventCountry "URS"]
[SourceTitle "MainBase"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "2"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 d6 6. Nh3 Nf6 7. O-O Bg4 8. f3
Bxh3 9. Bxh3 O-O 10. Be3 Ne8 11. Qd2 Nc7 12. Rae1 b6 13. Nd1 d5 14. Qe2 e6 15.
f4 f5 $10 16. Bc1 Rf7 17. Bg2 Qd7 18. Nf2 Rd8 19. c3 b5 20. exd5 exd5 21. Bd2
c4 22. Qf3 Ne7 23. dxc4 bxc4 (23... dxc4 24. Be3 $1) 24. b3 $1 Nc8 25. bxc4
dxc4 26. Bc1 Qa4 27. Rd1 $1 Rdf8 (27... Rxd1 $6 28. Rxd1) (27... Rfd7 $6 28.
Rxd7 Rxd7 29. Re1) 28. Be3 $1 Nb6 (28... Qxa2 $6 29. Bc5 Re8 30. Qc6 {/\ 31.Bd5
}) 29. Bc5 (29. Nh3 $5 h6 30. Rd6) 29... Rc8 30. Bb4 Na6 (30... a5 $2 31. Bc5)
31. Bd6 Qa5 32. g4 Qxc3 33. Qe2 $1 Qf6 $138 {[>= 33...Nc5!?]} 34. Rfe1 $1 Rd7
35. Be7 $1 Rxe7 (35... Qf7 $2 36. Rxd7 Nxd7 37. Bb7 $1 $18) 36. Qxe7 Qxe7 37.
Rxe7 Nc5 38. gxf5 c3 $1 (38... gxf5 39. Bh3 $1) 39. fxg6 hxg6 40. Re2 (40. Rxa7
Bd4 $1 41. Rxd4 c2 42. Rd1 Nd3 $1 $44) 40... Rc7 41. Ne4 (41. Ng4 $5) 41... Ne6
$1 42. Nxc3 $1 {(sealed)} (42. Ng5 Nxf4 43. Re8+ Bf8 44. Be4 c2 45. Bxc2 Rxc2
46. Rdd8 Nd7) 42... Nd4 $1 (42... Nxf4 43. Re8+ Kf7 44. Nb5 $1) 43. Re5 $1 (43.
Red2 Rxc3 44. Rxd4 Bxd4+ 45. Rxd4 Rc2 $1) 43... Bxe5 44. fxe5 Rxc3 45. Rxd4 Kf7
46. Rd6 Rc5 47. Rf6+ Kg7 48. Be4 Rxe5 49. Rxg6+ Kf7 50. Bc2 (50. Rg4 $1 {
/\ 51.Bc2}) 50... Re1+ 51. Kf2 Ra1 52. Rc6 Rxa2 53. h4 Nd5 54. Kf3 Ra3+ 55. Ke4
Rc3 1/2-1/2

[Event "World-ch25 Petrosian-Spassky +4-3=17"]
[Site "Moscow"]
[Date "1966.05.18"]
[Round "16"]
[White "Petrosian, Tigran V"]
[Black "Spassky, Boris Vasilievich"]
[Result "1/2-1/2"]
[ECO "B06"]
[Annotator "Bulletin"]
[PlyCount "97"]
[EventDate "1966.04.11"]
[EventType "match"]
[EventRounds "24"]
[EventCountry "URS"]
[SourceTitle "MainBase"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "2"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. d4 g6 2. e4 Bg7 3. Nf3 d6 4. Be2 e6 5. c3 Nd7 6. O-O Ne7 7. Nbd2 b6 8. a4 a6
(8... Bb7 9. a5 $1) 9. Re1 Bb7 10. Bd3 O-O 11. Nc4 Qe8 12. Bd2 (12. e5 $5 d5 (
12... dxe5 13. Nfxe5 $14) 13. Ne3) 12... f6 13. Qe2 Kh8 14. Kh1 Qf7 $13 15. Ng1
e5 $1 (15... f5 $6 16. exf5 Nxf5 17. Qxe6 Nh4 18. f3) 16. dxe5 fxe5 17. f3 Nc5
18. Ne3 Qe8 $1 (18... Nxd3 $6) 19. Bc2 a5 20. Nh3 Bc8 (20... Ba6 $5) 21. Nf2
Be6 22. Qd1 Qf7 23. Ra3 Bd7 24. Nd3 $1 Nxd3 25. Bxd3 Bh6 26. Bc4 Qg7 27. Re2
Ng8 {[/\ Nf6-h5-h4]} 28. Bxg8 $1 Rxg8 29. Nd5 Bxd2 30. Rxd2 Be6 31. b4 Qf7 32.
Qe2 Ra7 $1 33. Ra1 Rf8 (33... axb4 $5 34. cxb4 Rga8 35. Qd1 Kg7 $13) 34. b5
Raa8 35. Qe3 Rab8 36. Rf1 Qg7 37. Qd3 Rf7 38. Kg1 Rbf8 39. Ne3 g5 40. Rdf2 h5
41. c4 $1 {(sealed)} Qg6 42. Nd5 $1 Rg8 (42... Bxd5 43. cxd5 g4 $6 44. fxg4
Rxf2 (44... hxg4 $2 45. Rxf7 Rxf7 46. Rxf7 Qxf7 47. Qe3 $1 Qg6 48. Kf2 $1 $16)
45. Rxf2 Rxf2 46. Kxf2 Qxg4 $10) 43. Qe3 Kh7 44. Qd2 Rgg7 45. Qe3 Kg8 46. Rd2
Kh7 47. Rdf2 Rf8 48. Qd2 Rgf7 49. Qe3 1/2-1/2

[Event "World-ch25 Petrosian-Spassky +4-3=17"]
[Site "Moscow"]
[Date "1966.05.20"]
[Round "17"]
[White "Spassky, Boris Vasilievich"]
[Black "Petrosian, Tigran V"]
[Result "1/2-1/2"]
[ECO "B25"]
[Annotator "Bulletin"]
[PlyCount "58"]
[EventDate "1966.04.11"]
[EventType "match"]
[EventRounds "24"]
[EventCountry "URS"]
[SourceTitle "MainBase"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "2"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. Nc3 g6 4. g3 Bg7 5. Bg2 Nf6 6. d3 O-O 7. Nh4 Rb8 8. f4
d6 9. O-O Bd7 10. f5 $1 b5 11. Bg5 b4 12. Nd5 a5 (12... Nxd5 13. exd5 Ne5 14.
Qd2 $16) 13. Kh1 (13. Qd2 $142 $5) 13... Ne5 14. Qd2 Bc6 15. Rae1 $14 a4 16.
Qe2 (16. Bh6 $5) (16. h3 $142 $5 {/\ 17.g4}) 16... Qd7 17. Bc1 Qb7 18. Ne3 e6
19. fxe6 $6 (19. g4 exf5 20. Nhxf5 $5) 19... fxe6 20. Nf3 Nxf3 21. Rxf3 d5 $1
$36 22. exd5 exd5 23. Ng4 Rbe8 24. Nxf6+ Bxf6 25. Re3 Rxe3 26. Qxe3 Re8 27. Qf2
Rxe1+ 28. Qxe1 Kf7 29. Qe2 Qe7 1/2-1/2

[Event "World-ch25 Petrosian-Spassky +4-3=17"]
[Site "Moscow"]
[Date "1966.05.23"]
[Round "18"]
[White "Petrosian, Tigran V"]
[Black "Spassky, Boris Vasilievich"]
[Result "1/2-1/2"]
[ECO "E12"]
[Annotator "Bulletin"]
[PlyCount "65"]
[EventDate "1966.04.11"]
[EventType "match"]
[EventRounds "24"]
[EventCountry "URS"]
[SourceTitle "MainBase"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "2"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. Nc3 Bb7 5. a3 Bxf3 $2 (5... Be7 6. d5 $16) (
5... d5 $10) 6. gxf3 Be7 7. f4 d5 8. f5 $1 {[/\ 9.fxe6, Bh3]} exf5 9. Bg2 O-O
$5 10. cxd5 (10. Nxd5 Nxd5 11. Bxd5 c6 12. Bg2 Bd6 {/\ 13...Qh4<=>}) 10... Bd6
(10... Nbd7 11. Qd3 $1 (11. d6 Bxd6 12. Bxa8 $44)) 11. Qd3 g6 12. Bg5 Re8 13.
h4 (13. O-O-O $1 Nbd7 (13... h6 14. Bd2 $1 (14. Bxh6 $2 Ng4 $1)) 14. f3 (14. e4
$2 fxe4 15. Nxe4 Be7 16. d6 cxd6 17. Nxf6+ Bxf6 18. Bxf6 Rc8+) 14... f4 15. Bh3
Re3 16. Qb5 Qe8 17. Ne4 $16) 13... Nbd7 14. h5 $16 Rb8 15. hxg6 $6 (15. Qh3
$142 Qe7 $1 16. Kf1 Qf8 17. Bf3 b5 18. e3 Qg7 19. Ne2 $16) 15... fxg6 16. O-O-O
b5 $1 17. Nxb5 (17. e4 fxe4 18. Bxe4 (18. Nxe4 Be7 19. Bh3 Nf8 $1) 18... Nf8 $1
19. Qh3 Bf4+ $1 (19... Be7 $2 20. Bxg6 hxg6 21. Qh8+ Kf7 22. Bh6 $1)) 17... Qc8
18. Rd2 Qb7 (18... Qa6 19. Nxd6 Qxd6 20. Rc2 Nxd5 $16 (20... Ne4 21. Bxe4 fxe4
22. Qh3 Nf8 23. Rc6 Qxd5 24. Rxg6+ hxg6 25. Qh8+ Kf7 26. Qf6+ Kg8 27. Rh8# {#})
) 19. Nc3 Qb3 20. Qc2 Kg7 $1 (20... Bxa3 $2 21. Qxb3 Rxb3 22. bxa3 Rxc3+ 23.
Kb2) 21. Bf3 (21. Qxb3 Rxb3 22. Kc2 Reb8 23. Na4 $14 Ne4 (23... R3b5 24. b4
Nxd5 25. Bxd5 Rxd5 26. Nc3 $18) 24. Bxe4 fxe4 25. Rh4 $16) 21... h5 $1 22. Qxb3
Rxb3 23. Rc2 Reb8 24. e3 Kf7 25. Rd1 (25. Be2 $2 Rxc3 26. Rxc3 Ne4) (25. Nb1
$142 $5 {/\ 26.Nd2, 27.Nc4}) 25... Nb6 {[/\ 26...Nc4]} 26. Bxf6 (26. Be2 Rxc3
$1 27. Rxc3 Ne4) 26... Kxf6 27. Be2 h4 28. f4 Re8 29. Kd2 Rxc3 $1 30. Rxc3 $1 (
30. bxc3 Nxd5 31. Bb5 Rxe3 32. c4 Bxf4 33. cxd5 Rb3+) 30... Nxd5 31. Bb5 $1 (
31. Rc6 Nxe3 32. Rh1 Ng2) (31. Rb3 Nxe3 32. Rxe3 Bxf4) 31... Nxc3 (31... Rxe3
$6 32. Rxe3 Bxf4 33. Rde1 g5 34. Kd3 Nxe3 35. Rxe3 Bxe3 36. Kxe3 $14) 32. Bxe8
Nxd1 33. Kxd1 1/2-1/2

[Event "World-ch25 Petrosian-Spassky +4-3=17"]
[Site "Moscow"]
[Date "1966.05.27"]
[Round "19"]
[White "Spassky, Boris Vasilievich"]
[Black "Petrosian, Tigran V"]
[Result "1-0"]
[ECO "C11"]
[Annotator "Bulletin"]
[PlyCount "135"]
[EventDate "1966.04.11"]
[EventType "match"]
[EventRounds "24"]
[EventCountry "URS"]
[SourceTitle "MainBase"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "2"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5 Nfd7 5. Nf3 c5 6. dxc5 Nc6 7. Bf4 Bxc5 8.
Bd3 f6 9. exf6 Nxf6 10. O-O O-O 11. Ne5 (11. Bg3 $142 $5) 11... Bd7 $1 (11...
Ne4 12. Bxe4 Rxf4 13. Nd3 $1) 12. Nxc6 Bxc6 13. Qe2 Qe7 14. Rae1 Rae8 $10 15.
Bg3 a6 16. a3 Qf7 (16... Nd7 $5) 17. b4 (17. Qd2) 17... Bd4 18. Be5 (18. Nd1 e5
$1 19. c3 Ba7 20. Bxe5 $2 Nd7 $19) 18... Bxe5 19. Qxe5 Nd7 20. Qg3 e5 $1 21. f3
Qf4 $6 (21... Qf6 $5 22. Nd1 b5 23. Ne3 Qf4) (21... Re7) 22. Qxf4 Rxf4 23. Rf2
g6 24. Rd2 Nb6 25. Rde2 Nd7 26. Nd1 b5 27. c3 Rf7 28. Bc2 Kg7 29. Bb3 h5 30.
Ne3 Nb6 31. Nc2 Nd7 $2 (31... Rfe7 32. f4 e4 33. Nd4 Bd7) 32. Re3 $1 h4 33. h3
Rf6 34. Nd4 $1 Bb7 35. a4 Rd8 36. Ne2 bxa4 $6 (36... Kh6 $5) 37. Bxa4 Nb6 38.
Bb3 e4 (38... Re8 39. Nd4 Nd7 40. Ba4) 39. Nd4 Kh6 40. Rd1 Rc8 $2 {>=} (40...
Rd7 $5) 41. fxe4 $1 {(sealed)} (41. Ra1 Re8 42. Ra5 Rd6 43. Rc5) 41... dxe4 42.
Ne6 $1 {/\ 43.Nc5;} Nc4 (42... a5 $2 43. Rd6 $1 (43. Nc5 Ba8 44. Nxe4 Bxe4 45.
Rxe4 axb4 46. Rxh4+ Kg7) (43. bxa5 Nc4 44. Bxc4 Rxc4 45. Nd4 Ra4 $1) 43... Nc4
44. Bxc4 Rxc4 45. Nd8 $1 $18 Rxd6 46. Nf7+ Kh5 47. Nxd6 Rc7 48. Nxb7 Rxb7 49.
bxa5 $18) (42... Na4 43. Rd7 (43. Rc1 Nb2 44. Nc5 Rxc5 45. bxc5 Nd3) 43... Ba8
44. Rc7 Rb8 45. g4 $1) (42... Bd5 43. Bxd5 Nxd5 44. Rxe4 $18) 43. Bxc4 Rxc4 44.
Nc5 Rf7 45. Ra1 Kg5 46. Ra5 $1 (46. Nxa6 Bxa6 47. Rxa6 Rd7 $1 $10) 46... Kf4 (
46... Kh6 47. Nxb7 Rxb7 48. Rxa6 Rbc7 49. Re6 Rxc3 50. Rxc3 Rxc3 51. Rxe4 $18)
47. Kf2 Bd5 48. Nb3 $1 Ke5+ (48... Bb7 49. Nd4 $1 {/\ 50.Ne2#}) 49. Ke2 Rc6 50.
Nd2 Ke6 (50... Rf4 $2 51. c4 $1 $18) 51. Nxe4 Bc4+ 52. Kd2 Rd7+ 53. Kc2 Kf7 54.
Re5 Kg7 55. Nd2 Bb5 56. Nf3 Ba4+ 57. Kb2 Rd1 58. R5e4 Rf1 59. Re1 Rxe1 60. Rxe1
Rf6 61. Re4 g5 62. Nxg5 Rf2+ 63. Ka3 Bc6 64. Rxh4 Bxg2 65. Ne4 Re2 66. Nc5 Bf1
67. Rf4 Re1 68. h4 1-0

[Event "World-ch25 Petrosian-Spassky +4-3=17"]
[Site "Moscow"]
[Date "1966.05.30"]
[Round "20"]
[White "Petrosian, Tigran V"]
[Black "Spassky, Boris Vasilievich"]
[Result "1-0"]
[ECO "E59"]
[Annotator "Bulletin"]
[PlyCount "81"]
[EventDate "1966.04.11"]
[EventType "match"]
[EventRounds "24"]
[EventCountry "URS"]
[SourceTitle "MainBase"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "2"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 c5 6. Nf3 d5 7. O-O Nc6 (7...
dxc4 8. Bxc4 Nbd7) 8. a3 Bxc3 9. bxc3 dxc4 10. Bxc4 Qc7 11. Bd3 e5 12. Qc2 Bg4
$6 (12... Re8 $5 13. Nxe5 Nxe5 14. dxe5 Qxe5 15. f3 Bd7 16. a4 Bc6 17. e4 Rad8
18. Bc4 b6 19. Bd2 Rd7 $14) 13. Nxe5 Nxe5 14. dxe5 Qxe5 15. f3 Bd7 16. a4 $1 (
16. Re1 Ba4 $1 17. Qb2 Rad8 18. Bf1 b6 19. c4 Rfe8 20. Qxe5 Rxe5 21. e4 Nd7 22.
Bb2 Re6 23. e5 Nb8 24. Be2 Nc6 $13 {Geller-Spassky, Amsterdam (ct) 1956}) 16...
Rfe8 (16... c4 $5 17. Bxc4 (17. Be2 $6 Nd5) 17... Rac8 $1) 17. e4 {[/\ 18.f4,
19.e5]} c4 (17... Qc7 {(or 17...Qe7)} 18. c4 $16) 18. Be2 Be6 (18... Qc5+ 19.
Kh1 $5) 19. Be3 Qc7 20. Rab1 Nd7 21. Rb5 $1 $16 b6 22. Rfb1 Qc6 23. Bd4 f6 24.
Qa2 Kh8 25. Bf1 h6 26. h3 Rab8 27. a5 Rb7 (27... a6 28. Rxb6 $1 Nxb6 29. axb6
Qb7 30. Qa5 $16) 28. axb6 axb6 29. Qf2 $6 (29. Qb2 $142 $1 Ra8 30. Qb4 Rba7 31.
Bxb6 Ra3 32. Bd4 Rb3 33. Rxb3 cxb3 34. c4 $1) 29... Ra8 30. Qb2 Rba7 $1 (30...
Ra6 31. Qb4 $1 $16) 31. Bxb6 Ra2 (31... Ra3 $5 32. Bf2 Rb3 33. Rxb3 cxb3 34. c4
Rb8) 32. Qb4 Rc2 $2 (32... R2a4 {(Nikitin)} 33. Qe7 Rb8 34. R5b2 Raa8 35. Bc7
$16 (35. Bd4 Re8 36. Qb4 Reb8 37. Qxb8+ Rxb8 38. Rxb8+ Nxb8 39. Rxb8+ Kh7 40.
Rb4 $10 {/+/=})) (32... R8a3 $1 33. Bd4 Rb3 34. Rxb3 cxb3 35. c4 Rc2 $1 36.
Qxb3 Rc1 $1 (36... Rxc4 $5 37. Bxc4 Bxc4 38. Rb8+ Nxb8 39. Qxb8+ Kh7 $10 {/+/=}
) 37. Rd5 $1 $13) (32... R2a3 33. Bd4 Rb3 34. Rxb3 cxb3 35. c4 $16) 33. Bf2 Qc7
(33... Raa2 34. Bg3 $1) 34. Qe7 Bxh3 $2 (34... Qc6 35. Bd4 $16) 35. gxh3 Rxf2
36. Kxf2 Qh2+ 37. Bg2 Ne5 38. Rb8+ Rxb8 39. Rxb8+ Kh7 40. Rd8 Ng6 (40... Nd3+
41. Rxd3 $18) 41. Qe6 1-0

[Event "World-ch25 Petrosian-Spassky +4-3=17"]
[Site "Moscow"]
[Date "1966.06.01"]
[Round "21"]
[White "Spassky, Boris Vasilievich"]
[Black "Petrosian, Tigran V"]
[Result "1/2-1/2"]
[ECO "C13"]
[Annotator "Bulletin"]
[PlyCount "78"]
[EventDate "1966.04.11"]
[EventType "match"]
[EventRounds "24"]
[EventCountry "URS"]
[SourceTitle "MainBase"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "2"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 dxe4 5. Nxe4 Be7 6. Bxf6 Bxf6 7. c3 Nd7 8.
Nf3 O-O 9. Bd3 e5 $1 10. Qc2 (10. Qd2 $5) 10... exd4 11. cxd4 g6 12. h4 $1 Bg7
$1 13. h5 Nf6 14. hxg6 hxg6 15. O-O-O (15. Neg5 $1 Qe7+ 16. Kf1 Nd5 17. Re1) (
15. Neg5 $1 Nd5 $13) 15... Nxe4 $1 16. Bxe4 Bg4 $1 $10 17. Qb3 (17. Bxb7 $2 Rb8
18. Be4 Bxf3 19. Bxf3 Bxd4 $17) 17... Qd6 18. Rh4 (18. Qxb7 $2 Rab8 19. Qd5
Qf4+ 20. Kb1 Rfd8 $17) (18. Kb1 $5) 18... Qf4+ $1 19. Qe3 Qxe3+ 20. fxe3 Bxf3
21. gxf3 c6 22. Kd2 Rfe8 23. b4 Bf6 24. Rg4 Re7 25. Bd3 Rae8 26. Re1 a6 27. Bc4
Kg7 28. Rgg1 Rh8 29. Rh1 Rxh1 30. Rxh1 Rd7 31. Bb3 Bd8 32. f4 f5 33. Kd3 a5 34.
bxa5 Bxa5 35. Rc1 Kf6 36. Rc4 Rd8 37. Ke2 Bc7 38. Ra4 g5 39. fxg5+ Kxg5 1/2-1/2

[Event "World-ch25 Petrosian-Spassky +4-3=17"]
[Site "Moscow"]
[Date "1966.06.03"]
[Round "22"]
[White "Petrosian, Tigran V"]
[Black "Spassky, Boris Vasilievich"]
[Result "1-0"]
[ECO "A40"]
[Annotator "Bulletin"]
[PlyCount "70"]
[EventDate "1966.04.11"]
[EventType "match"]
[EventRounds "24"]
[EventCountry "URS"]
[SourceTitle "MainBase"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "2"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. d4 b5 2. e4 Bb7 3. f3 a6 4. Be3 (4. c4 $5 bxc4 5. Bxc4 e6 6. Nc3 d5 $2 7.
Qb3 $1 Nc6 8. exd5 $1 Nxd4 9. Qxb7 $2 Rb8 $2 10. Qxa6 Ra8 11. Bb5+ Ke7 12. d6+
{1:0, Euwe-Abrahams, Bournemouth 1939}) 4... e6 5. Nd2 Nf6 6. c3 Be7 7. Bd3 d6
8. a4 c6 9. Ne2 Nbd7 10. O-O O-O 11. Ng3 Re8 12. axb5 axb5 {>=} (12... cxb5 $6
{(O'Kelly)} 13. Nb3 Rc8 14. Na5 Ba8 {Tal}) 13. Rxa8 Qxa8 14. Qc2 Bf8 15. b4 $1
$16 Qb8 16. Nb3 g6 17. Ra1 e5 18. Qf2 $1 d5 19. dxe5 Nxe5 20. Bc2 Bg7 (20... h5
$5 21. exd5 h4 22. Ne4 Nxe4 23. Bxe4 cxd5 24. Bc2 h3 $132 {>> Tal}) 21. Ba7 Qc7
22. Bb6 Qb8 23. Ba7 Qc7 24. Bb6 Qb8 25. Ba7 Qc8 $2 (25... Qc7 $10) 26. Bd4 $1
h5 27. h3 {(/\ 28.f4, 29.e5+/- O'Kelly)} h4 28. Nf1 dxe4 29. fxe4 Ned7 30. Nfd2
$1 (30. e5 $5 Nxe5 31. Nc5 $5) 30... c5 31. Nxc5 Nxc5 32. bxc5 $1 Bxe4 (32...
Nxe4 $2 33. Bxe4 Bxe4 34. Bxg7 Kxg7 35. Qd4+ $18) 33. Bb3 $1 (33. Bxf6 Bxc2 34.
Bxg7 Kxg7 35. Nf3 $16 {Tal}) 33... Bf5 34. Ra7 $1 Nd7 (34... Rf8 35. Qxh4 $1
$18) 35. Nf3 Qb8 (35... Qb8 36. c6 $1 $18 (36. Bxf7+ Kxf7 37. Rxd7+ Bxd7 38.
Ne5+ Kg8 39. Qf7+ $18 {Tal})) 1-0

[Event "World-ch25 Petrosian-Spassky +4-3=17"]
[Site "Moscow"]
[Date "1966.06.06"]
[Round "23"]
[White "Spassky, Boris Vasilievich"]
[Black "Petrosian, Tigran V"]
[Result "1-0"]
[ECO "C13"]
[Annotator "Bulletin"]
[PlyCount "62"]
[EventDate "1966.04.11"]
[EventType "match"]
[EventRounds "24"]
[EventCountry "URS"]
[SourceTitle "MainBase"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "2"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 dxe4 5. Nxe4 Be7 6. Bxf6 Bxf6 7. Nf3 Bd7 $5
8. Qd2 (8. Bd3 Bc6 9. c3 Nd7 10. Qe2 Be7 11. O-O O-O 12. Rad1 Nf6 $10) 8... Bc6
9. Nxf6+ Qxf6 10. Ne5 O-O 11. O-O-O Nd7 $6 {>=} (11... Rd8 $5 12. h4 Be8 13.
Rh3 Nc6) 12. Nxc6 bxc6 13. h4 $1 Rab8 14. Rh3 c5 (14... Rb6 $5 15. Qg5 Rfb8)
15. Qg5 $1 $16 cxd4 (15... Qxf2 $2 16. Rf3 Qg1 17. Bb5 $1 $18) (15... Rfd8 16.
Rhd3 $16) 16. Qxf6 Nxf6 17. Rxd4 Rb7 18. Rb3 $1 Rxb3 19. axb3 Ra8 20. Rc4 Ne8 (
20... Nd5 21. g3 $16 (21. Rc5 $16)) 21. Ra4 Nd6 22. g3 $1 Kf8 (22... Nc8 23.
Rc4) (22... a5 23. b4) 23. Bg2 Rc8 24. Rxa7 Ke7 25. Kd2 h6 26. c4 g5 27. hxg5
hxg5 28. Kc3 Kd7 29. b4 Rh8 30. b5 Rh2 (30... Nc8 31. Bc6+ Kd8 32. Ra8 $18) 31.
Bc6+ Kd8 (31... Kd8 32. c5 (32. b6 $6 cxb6 33. Rd7+ Kc8 34. Rxd6 Kc7 35. Rd7+
Kxc6 36. Rxf7 $16) 32... Nf5 33. b6 $18) 1-0

[Event "World-ch25 Petrosian-Spassky +4-3=17"]
[Site "Moscow"]
[Date "1966.06.08"]
[Round "24"]
[White "Petrosian, Tigran V"]
[Black "Spassky, Boris Vasilievich"]
[Result "1/2-1/2"]
[ECO "E61"]
[Annotator "Bulletin"]
[PlyCount "153"]
[EventDate "1966.04.11"]
[EventType "match"]
[EventRounds "24"]
[EventCountry "URS"]
[SourceTitle "MainBase"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "2"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 O-O 5. Nc3 d6 6. e3 Nbd7 7. Nge2 a6 (7...
c6 $5) (7... e5) 8. b3 Rb8 9. a4 $1 a5 10. Ba3 c6 11. O-O Qc7 12. Qd2 Re8 13.
Rac1 Ra8 14. Rfd1 Nb8 15. h3 Na6 16. Kh2 h5 17. f4 $1 $8 Nb4 18. Rf1 {[18.d5 /
\ e3-e4]} e5 19. fxe5 (19. e4) 19... dxe5 20. d5 Rd8 21. e4 Nd7 (21... h4 22.
g4 Bxg4 $6) 22. Rb1 Nc5 23. Na2 Nba6 24. Qe3 Qb6 (24... b6 25. Nec3 Bb7 26.
dxc6 Bxc6 27. Nd5 $14) 25. Nec1 Qa7 (25... Nxa4 $2 26. Qf3 $1 f6 (26... Rd7 27.
h4 $16) 27. Nd3 N4c5 28. Qe3 Nd7 29. c5 $16) 26. Nd3 Nxd3 27. Qxd3 Re8 {>=} (
27... Bd7 {/\ 28...Be8}) 28. Rb2 Nc5 29. Qe3 Nd7 30. Qc1 (30. Qxa7 Rxa7 31. c5
{/\ Rbf2}) (30. Qg5 $1 {/\ 31.Rbf2->}) 30... Qb6 31. Rbf2 f6 (31... Qxb3 32.
Rf3 Qxa4 (32... Qxa2 $2 33. R1f2 $1 $18) 33. Rxf7 $16) 32. Rf3 Qd8 33. Nc3 Nf8
34. Qc2 (34. Rd1 $142 $1) 34... Nh7 35. Rd3 Qc7 36. Qe2 Bh6 37. h4 Bf8 38. d6
$6 (38. Bxf8) 38... Qf7 39. Bh3 Bxh3 40. Kxh3 Red8 (40... b6 $5) 41. c5 $1 $10
{(sealed)} Qe6+ (41... Qxb3 42. Nd5 $1 Qxa4 43. Nb6 (43. Nxf6+)) 42. Kg2 Bh6
43. Nd1 Nf8 44. Nb2 Nd7 45. Rdf3 Qg4 (45... Rf8 46. Qc4 Kf7 $10) 46. Qc4+ Kg7
47. Nd3 Re8 48. Rb1 $2 (48. Bb2 $5 g5 $5 (48... Qe6 49. Nxe5 $1 Nxe5 50. Qxe6
Rxe6 51. Rxf6) (48... Rf8 49. Nxe5 Nxe5 (49... fxe5 50. Rf7+ Kh8 51. Rxd7 Rxf1
52. Bxe5+ $18) 50. Rxf6 Nxc4 51. Rxf8+ Nxb2 52. R1f7# {#}) (48... Kh7 49. Rxf6
Nxf6 50. Rxf6) 49. Rf5 gxh4 50. R1f3 {/\ 51.Nf2}) 48... Qe6 49. Qxe6 Rxe6 50.
b4 axb4 51. Rxb4 Ra7 52. Rb2 (52. Rf2 $142 $5) (52. Rf1 $142 $5) 52... Re8 53.
Rf1 Kf7 $1 (53... Rxa4 $2 54. Rxb7 Rd8 55. Nb4 $1 $18) (53... Kg8 $1 54. a5
Rxa5 55. Rxb7 Rxa3 $17) 54. a5 Ke6 (54... Rxa5 55. Rxb7 Rxa3 56. Nxe5+ Rxe5 57.
Rxd7+) 55. Bb4 Be3 $1 56. Re2 Bd4 57. Kh3 Rf8 (57... Rea8 58. Ra2 f5 $1) 58.
Rc1 Raa8 59. Kg2 Rg8 {>=} (59... g5 $5 60. hxg5 fxg5 61. Rh1 Rh8 $17) 60. Ne1
g5 61. Nf3 gxh4 62. Nxh4 Rg4 63. Nf5 Rag8 64. Kh3 R8g5 {>=} (64... h4 65. gxh4
Rf4 $13) 65. Rb1 Rxe4 66. Rxe4 Rxf5 67. Re2 Rf3 68. Kg2 Rd3 69. Rd2 Re3 70. Ra2
$1 f5 (70... Bxc5 71. Bxc5 Nxc5 72. Rxb7 $3) (70... h4) 71. Be1 Nxc5 72. Bf2
Rb3 $1 73. Rxb3 Nxb3 74. Ra3 Nc5 75. Bxd4 exd4 76. Rf3 d3 77. Kf2 1/2-1/2

