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Up Topic Rybka Support & Discussion / Rybka Discussion / Long games, pawn and move
- - By turbojuice1122 (Gold) Date 2007-08-01 15:51
Hi all,

I have played a number of games on my computer at time controls of 120'+60" with Rybka as black and some strong engine as white; Rybka's f7-pawn has been taken away for each game.  The results are as follows:

Fritz 10: 1-0
Spike 1.2 Turin: 1-0
Ktulu 8: 1/2
Naum 2.1: 0-1
Rybka Winfinder 2.2: 1/2
Loop 10.32f: 0-1
Fruit 2.3: 1-0
Fruit 2.2.1: 1/2
Shredder 10: 0-1
Junior 10: 0-1
Toga II 1.2.1a: 1/2
Rybka 1.1: 1-0
Rybka 1.2n: 1-0
Zap!Chess Zanzibar: 1-0
Hiarcs 10: 1/2
Gambit Fruit 1.0 Beta 4bx: 1-0
Fritz 9: 1-0
Shredder 9: 0-1
Fruit 061115a: 1-0

Average rating of white programs: about 2900 (scaled roughly from CEGT to SSDF and adjusted for hardware)
Total results: 11.5-7.5
Rybka performance rating: 2840

Thus, one would expect Joel Benjamin to need to play near the level of a 2840-rated computer to draw the match.  In actuality, Larry's computer is at least 100 elo stronger than my computer in terms of hardware (mine is a fast, single 64-bit Athlon with 2 GB RAM).

The games are as follows (I have deleted the commentary such as how much time was spent on each move; if you want that for a particular game, feel free to post):

[Event "Fritz-Rybka f7-pawn-1"]
[Site "?"]
[Date "2007.07.13"]
[Round "1"]
[White "Fritz 10"]
[Black "Rybka 2.3.2a 32-bit"]
[Result "1-0"]
[WhiteElo "2950"]
[BlackElo "3070"]
[SetUp "1"]
[FEN "rnbqkbnr/ppppp1pp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQk - 0 1"]
[PlyCount "71"]
[EventDate "2007.07.13"]
[EventType "tourn"]
[Source "Buczyna"]

1. e4 e6 2. d4 Nc6 3. Nf3 d5 4. e5 Nge7 5. h4 Nf5 6. g4 Nh6 7. Ng5 Be7 8. c3
Nf7 9. Qd3 Nxg5 10. hxg5 g6 11. Qh3 Kf7 12. Bd3 Bxg5 13. f4 Be7 14. Bxg6+ hxg6
15. Qxh8 Qxh8 16. Rxh8 Bf8 17. Be3 Bg7 18. Rh3 b6 19. Nd2 a5 20. a4 Ba6 21. Nf3
Kg8 22. Kd2 Re8 23. Rg1 Bc8 24. b3 Rf8 25. Ng5 Re8 26. Nh7 Nb8 27. g5 Kf7 28.
Nf6 Rd8 29. Rh7 Na6 30. Rgh1 c6 31. Ke2 Kf8 32. Bd2 Kf7 33. c4 dxc4 34. bxc4
Rg8 35. Rb1 c5 36. d5 1-0

[Event "Spike-Rybka f7-pawn long"]
[Site "?"]
[Date "2007.07.14"]
[Round "1"]
[White "Spike 1.2 Turin"]
[Black "Rybka 2.3.2a 32-bit"]
[Result "1-0"]
[WhiteElo "2900"]
[BlackElo "3070"]
[SetUp "1"]
[FEN "rnbqkbnr/ppppp1pp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQk - 0 1"]
[PlyCount "65"]
[EventDate "2007.07.14"]
[EventType "tourn"]
[Source "Buczyna"]

1. e4 e6 2. d4 Nc6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 d6 6. Qh5+ g6 7. Qd1 Nf6 8.
Bd3 O-O 9. Bg5 e5 10. Ne2 Qe8 11. f3 Na5 12. O-O c5 13. Ng3 b6 14. f4 exd4 15.
f5 Bb7 16. Qe2 Nd7 17. cxd4 cxd4 18. Bh6 Rf6 19. Qg4 Ne5 20. Qh4 Rf7 21. fxg6
Nxg6 22. Qh3 Bc8 23. Qh5 Be6 24. Rxf7 Bxf7 25. Rf1 Nc6 26. Bb5 Rc8 27. Nf5 Rc7
28. Bg5 Nge5 29. Qh4 Qe6 30. Bf6 Ng6 31. Qg5 d5 32. Bxc6 Qxc6 33. Be7 1-0

[Event "Ktulu-Rybka f7-pawn"]
[Site "?"]
[Date "2007.07.14"]
[Round "1"]
[White "Ktulu 8"]
[Black "Rybka 2.3.2a 32-bit"]
[Result "1/2-1/2"]
[WhiteElo "2880"]
[BlackElo "3070"]
[SetUp "1"]
[FEN "rnbqkbnr/ppppp1pp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQk - 0 1"]
[PlyCount "140"]
[EventDate "2007.07.14"]
[EventType "tourn"]
[Source "Buczyna"]

1. e4 e6 2. Nf3 c5 3. Nc3 Nc6 4. Bb5 Nge7 5. d3 Ng6 6. Bxc6 bxc6 7. Ng5 h6 8.
Qh5 Qf6 9. Nf3 Qf7 10. Be3 d6 11. d4 cxd4 12. Nxd4 Bd7 13. f4 e5 14. Nde2 exf4
15. O-O Be7 16. Nxf4 Nxf4 17. Qxf7+ Kxf7 18. Bxf4 Ke6 19. Bg3 g5 20. Rfd1 h5
21. Rd2 h4 22. Bf2 Be8 23. Rad1 Bg6 24. Be3 Rab8 25. b3 Rb7 26. h3 Rf8 27. Rd4
a5 28. Rc4 Be8 29. a3 Rb8 30. Ne2 c5 31. Nc3 Bc6 32. Nd5 Bd8 33. Rc3 Bb5 34. a4
Be2 35. Rd2 Ba6 36. Bf2 Rc8 37. g3 c4 38. Kg2 cxb3 39. Rxb3 Rf7 40. Kg1 Rb7 41.
Rf3 Rb1+ 42. Kg2 hxg3 43. Bxg3 Rb2 44. Rc3 Rxc3 45. Nxc3 Be7 46. Kf3 Bb7 47.
Nb5 Ra2 48. Bxd6 Rxa4 49. Bxe7 Bxe4+ 50. Kg4 Bc6+ 51. Kxg5 Kxe7 52. Nd4 Bd7 53.
h4 Rc4 54. h5 Rc5+ 55. Kh4 Be8 56. h6 Kf6 57. Kg4 Rg5+ 58. Kf4 Rh5 59. Rf2 Rxh6
60. Ke4+ Kg6 61. Nf5 Rh1 62. c4 a4 63. Ne7+ Kg7 64. Kd4 Ra1 65. Nf5+ Kg6 66.
Nd6 Bd7 67. Nf7 Be6 68. Ne5+ Kg7 69. Nd3 a3 70. Rh2 Kf6 1/2-1/2

[Event "Naum-Rybka f7-pawn"]
[Site "?"]
[Date "2007.07.15"]
[Round "1"]
[White "Naum 2.1"]
[Black "Rybka 2.3.2a 32-bit"]
[Result "0-1"]
[WhiteElo "2890"]
[BlackElo "3070"]
[SetUp "1"]
[FEN "rnbqkbnr/ppppp1pp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQk - 0 1"]
[PlyCount "202"]
[EventDate "2007.07.15"]
[EventType "tourn"]
[Source "Buczyna"]

1. e4 e6 2. Nc3 c5 3. Nf3 Nc6 4. Bb5 Bd6 5. e5 Bc7 6. Ne4 Nge7 7. Nxc5 O-O 8.
d4 Bxe5 9. O-O Bc7 10. Qd3 Qe8 11. h3 Qh5 12. c4 b6 13. Ne4 Rxf3 14. Qxf3 Qxf3
15. gxf3 Nxd4 16. Rd1 Nef5 17. Be3 Nxf3+ 18. Kf1 Nxe3+ 19. fxe3 Ne5 20. Ke2 a6
21. Ba4 Bb7 22. Bc2 Bc6 23. b3 b5 24. c5 b4 25. a4 bxa3 26. Rxa3 Rf8 27. Rg1
Bb5+ 28. Kd1 Rf3 29. Ng5 Rxe3 30. Bxh7+ Kf8 31. Be4 Nd3 32. Bxd3 Rxd3+ 33. Kc2
Re3 34. Rg4 Be5 35. c6 Rc3+ 36. Kd1 Rxc6 37. b4 Ke8 38. Re3 Bb2 39. Nf3 Rc1+
40. Kd2 Rh1 41. Kc2 Bf6 42. Rg3 Ba4+ 43. Kd2 Rd1+ 44. Ke2 Rb1 45. Rg4 Rb2+ 46.
Kf1 Bc2 47. Nd4 Bh7 48. Nb3 Bf5 49. Rgg3 Ke7 50. Nc5 Rxb4 51. Nxa6 Rb1+ 52. Ke2
Rb2+ 53. Kf1 Rh2 54. Kg1 Rd2 55. Kf1 Bd4 56. Ra3 g6 57. Rgb3 Rh2 58. Ke1 e5 59.
Nc7 Bf2+ 60. Kf1 Bc5 61. Ra5 d6 62. Ke1 Bxh3 63. Nd5+ Kf7 64. Rf3+ Kg7 65. Rxc5
dxc5 66. Re3 Be6 67. Rxe5 Bxd5 68. Rxd5 Rh5 69. Rd7+ Kf6 70. Rd6+ Kf7 71. Ke2
Re5+ 72. Kf3 g5 73. Rb6 Ke7 74. Kg4 Kd7 75. Rb1 Kc6 76. Rc1 Kd5 77. Rd1+ Ke4
78. Re1+ Kd4 79. Rd1+ Kc3 80. Rc1+ Kb2 81. Rc4 Kb3 82. Rc1 c4 83. Rb1+ Kc2 84.
Rb8 c3 85. Rb7 Kc1 86. Rb8 Rc5 87. Rh8 c2 88. Rh1+ Kb2 89. Rh2 Kb1 90. Rh1+
c1=Q 91. Rxc1+ Kxc1 92. Kf3 Rc4 93. Ke3 Kc2 94. Ke2 Rc3 95. Kf1 Kd1 96. Kf2 g4
97. Kf1 Rc2 98. Kg1 Ke1 99. Kh1 Kf2 100. Kh2 Rc3 101. Kh1 Rh3# 0-1

[Event "RWF-Rybka232 f7-pawn"]
[Site "?"]
[Date "2007.07.16"]
[Round "1"]
[White "Rybka WinFinder 2.2 32-bit"]
[Black "Rybka 2.3.2a 32-bit"]
[Result "1/2-1/2"]
[WhiteElo "2940"]
[BlackElo "3070"]
[SetUp "1"]
[FEN "rnbqkbnr/ppppp1pp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQk - 0 1"]
[PlyCount "70"]
[EventDate "2007.07.16"]
[EventType "tourn"]
[Source "Buczyna"]

1. e4 e6 2. Nc3 c5 3. Nf3 Nc6 4. d4 cxd4 5. Nxd4 Nf6 6. Nxc6 bxc6 7. Bd3 Bd6 8.
f4 e5 9. O-O Qe7 10. f5 O-O 11. Bg5 Rb8 12. Rb1 Bc5+ 13. Kh1 Kh8 14. Qf3 a5 15.
b3 d6 16. Na4 Ba3 17. c4 Bb7 18. Rbe1 Rbd8 19. Qg3 Bb4 20. Re2 Rfe8 21. Qe3 d5
22. Qf3 Qd6 23. c5 Bxc5 24. Nxc5 Qxc5 25. Rfe1 Qd6 26. h3 d4 27. Rc2 Ra8 28.
Bd2 c5 29. Kh2 Rec8 30. Rc4 a4 31. b4 cxb4 32. Rxb4 Ba6 33. Rxa4 Bxd3 34. Rxa8
Rxa8 35. Qxd3 Rxa2 1/2-1/2

[Event "Loop-Rybka f7-pawn"]
[Site "?"]
[Date "2007.07.16"]
[Round "1"]
[White "Loop 10.32f"]
[Black "Rybka 2.3.2a 32-bit"]
[Result "0-1"]
[WhiteElo "2935"]
[BlackElo "3070"]
[SetUp "1"]
[FEN "rnbqkbnr/ppppp1pp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQk - 0 1"]
[PlyCount "74"]
[EventDate "2007.07.16"]
[EventType "tourn"]
[Source "Buczyna"]

1. e4 e6 2. d4 Nc6 3. Nf3 d5 4. Bb5 dxe4 5. Ne5 Bd7 6. Bxc6 Bxc6 7. Qh5+ g6 8.
Nxg6 Nf6 9. Qh4 hxg6 10. Qxh8 Kf7 11. c3 Qd5 12. Be3 Bb5 13. Nd2 Bd3 14. Qh4
Qb5 15. Nb3 a5 16. Bg5 Bg7 17. Rc1 a4 18. Nc5 Qxb2 19. Nxd3 exd3 20. O-O Qxa2
21. Rb1 Nd5 22. Qh3 Qc4 23. Qf3+ Kg8 24. Bd2 a3 25. Qe4 Kf7 26. Rxb7 a2 27. Ra1
Nxc3 28. Qf3+ Bf6 29. Bg5 Nd5 30. Bxf6 Nxf6 31. Qf4 e5 32. Qxe5 Nd5 33. Rb2 Re8
34. Qg5 Re2 35. Rxe2 dxe2 36. Qe5 c6 37. Re1 Qc2 0-1

[Event "FruitBeta-Rybka f7-pawn"]
[Site "?"]
[Date "2007.07.17"]
[Round "1"]
[White "Fruit 2.3"]
[Black "Rybka 2.3.2a 32-bit"]
[Result "1-0"]
[WhiteElo "2950"]
[BlackElo "3070"]
[SetUp "1"]
[FEN "rnbqkbnr/ppppp1pp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQk - 0 1"]
[PlyCount "131"]
[EventDate "2007.07.17"]
[EventType "tourn"]
[Source "Buczyna"]

1. e4 e6 2. d4 Nc6 3. Nf3 d5 4. Nc3 Bb4 5. Bd3 dxe4 6. Bxe4 Nf6 7. Bg5 O-O 8.
Qd3 h6 9. Bh4 Be7 10. Bxc6 bxc6 11. O-O-O Qe8 12. Bxf6 Bxf6 13. Ne4 a5 14. Qc3
Bb7 15. Rhe1 Qg6 16. Qb3 Bc8 17. Kb1 a4 18. Qc4 Qe8 19. Nc5 Qg6 20. Nxe6 Qf7
21. Re4 Bd7 22. Rde1 Rfe8 23. Qe2 a3 24. b3 Re7 25. Nc5 Rxe4 26. Qxe4 Re8 27.
Qf4 Rxe1+ 28. Nxe1 Bc8 29. Nf3 Qg6 30. Qg3 Qf7 31. Ne4 Bd8 32. Kc1 Bf5 33. Qf4
Qd5 34. Ng3 Bg6 35. Kd1 Kh7 36. c4 Qd6 37. Qe3 c5 38. d5 Qf6 39. Ne5 Bb1 40. f4
Kg8 41. Qc1 Bxa2 42. Qc2 Qxf4 43. Nf3 Bxb3 44. Qxb3 Be7 45. Kc2 Bf6 46. Kb1 Bb2
47. Qc2 Qf6 48. Ne4 Qf8 49. Ka2 Qe7 50. Qe2 Kh8 51. Nfd2 Qe8 52. h3 Qe5 53. Nb1
Qe8 54. Nxa3 Bf6 55. Qf3 Bd4 56. Nb5 Bg1 57. Nec3 Bh2 58. Kb3 Qg6 59. Qf8+ Kh7
60. Qxc5 Qf7 61. Qe3 Qd7 62. c5 Qc8 63. c6 h5 64. g3 Kh8 65. d6 Bg1 66. Qe5 1-0

[Event "Fruit22-Rybka f7-pawn"]
[Site "?"]
[Date "2007.07.17"]
[Round "1"]
[White "Fruit 2.2.1"]
[Black "Rybka 2.3.2a 32-bit"]
[Result "1/2-1/2"]
[WhiteElo "2895"]
[BlackElo "3070"]
[SetUp "1"]
[FEN "rnbqkbnr/ppppp1pp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQk - 0 1"]
[PlyCount "116"]
[EventDate "2007.07.17"]
[EventType "tourn"]
[Source "Buczyna"]

1. e4 e6 2. d4 Nc6 3. Nf3 d5 4. e5 Nh6 5. Bxh6 gxh6 6. Bb5 Bd7 7. O-O Bg7 8. c4
a6 9. Ba4 dxc4 10. d5 Ne7 11. dxe6 Bc6 12. Bxc6+ Nxc6 13. Na3 Qxd1 14. Raxd1 b5
15. Rd5 O-O 16. Nc2 Rae8 17. Ncd4 Nb4 18. Rc5 c6 19. Ne1 Rf4 20. Nxc6 Nxc6 21.
Rxc6 Bxe5 22. b3 a5 23. Nf3 Bf6 24. Re1 cxb3 25. axb3 Rb4 26. Nd2 Be7 27. Kf1
a4 28. bxa4 Rb2 29. Rd1 bxa4 30. Ne4 a3 31. Ra6 Kf8 32. Rd5 Reb8 33. Rf5+ Ke8
34. g3 R2b6 35. Rfa5 Kf8 36. f4 Rb4 37. Nc3 Rb2 38. Ra8 Rxa8 39. Rxa8+ Kg7 40.
f5 Kf6 41. g4 a2 42. Nd5+ Ke5 43. Nxe7 Rb1+ 44. Kf2 a1=Q 45. Rxa1 Rxa1 46. Nc8
Rc1 47. Nb6 Kd6 48. Nd7 Ke7 49. h4 h5 50. g5 Rc3 51. Ke2 Rc1 52. Nf6 Rc5 53.
Ng8+ Ke8 54. Nh6 Ke7 55. Kf3 Rc8 56. Ke4 Rb8 57. Kd5 Rb5+ 58. Kd4 Ra5 1/2-1/2

[Event "Shredder-Rybka f7-pawn"]
[Site "?"]
[Date "2007.07.20"]
[Round "1"]
[White "Shredder 10 UCI"]
[Black "Rybka 2.3.2a 32-bit"]
[Result "0-1"]
[WhiteElo "2925"]
[BlackElo "3070"]
[SetUp "1"]
[FEN "rnbqkbnr/ppppp1pp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQk - 0 1"]
[PlyCount "94"]
[EventDate "2007.07.20"]
[EventType "tourn"]
[Source "Buczyna"]

1. e4 e6 2. d4 Nc6 3. Nf3 d5 4. Bb5 dxe4 5. Ne5 Bd7 6. Bxc6 Bxc6 7. Nxc6 bxc6
8. Qh5+ Kd7 9. O-O Nf6 10. Qh4 Ke8 11. c3 c5 12. dxc5 Qd5 13. Be3 Kf7 14. Na3
Rd8 15. Qg3 e5 16. c4 Qe6 17. Nb5 c6 18. Nxa7 Ra8 19. Nxc6 Qxc6 20. b4 Qe6 21.
b5 Ra4 22. c6 Rxc4 23. Rfc1 Rxc1+ 24. Rxc1 Qd5 25. Bg5 Bc5 26. a4 h6 27. Be3
Ba3 28. Ra1 Rd8 29. h4 Bb2 30. Rf1 Qc4 31. Qh3 h5 32. Bg5 Kg6 33. a5 Bd4 34.
Bxf6 gxf6 35. Qg3+ Kf7 36. Rb1 Qc5 37. Qb3+ Kg7 38. Rf1 e3 39. fxe3 Bxe3+ 40.
Kh2 Rd4 41. Kh3 Qd6 42. b6 Rd3 43. Qxd3 Qxd3 44. Rf3 e4 45. Rg3+ Kf7 46. a6 Qa3
47. a7 Qc1 0-1

[Event "Junior-Rybka f7-pawn"]
[Site "?"]
[Date "2007.07.20"]
[Round "1"]
[White "Junior 10"]
[Black "Rybka 2.3.2a 32-bit"]
[Result "0-1"]
[WhiteElo "2885"]
[BlackElo "3070"]
[SetUp "1"]
[FEN "rnbqkbnr/ppppp1pp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQk - 0 1"]
[PlyCount "138"]
[EventDate "2007.07.20"]
[EventType "tourn"]
[Source "Buczyna"]

1. e4 e6 2. d4 Nc6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 d6 6. Qh5+ g6 7. Qe2 Nf6 8.
Nf3 O-O 9. Bh6 Re8 10. h4 e5 11. d5 Na5 12. h5 Nxh5 13. Ng5 Nf6 14. Rh4 c6 15.
Rb1 cxd5 16. exd5 Bf5 17. Qd2 Rc8 18. Rbb4 e4 19. Be2 Re5 20. c4 b5 21. Rxb5
Nxc4 22. Qb4 Nb6 23. c4 Qe7 24. Qb3 e3 25. f3 Bd7 26. Ra5 Nfxd5 27. f4 Qf6 28.
Bg7 Kxg7 29. Rxh7+ Kg8 30. Rf7 Qd8 31. Rxd5 Rxd5 32. cxd5 Rc1+ 33. Bd1 Bg4 34.
Qxe3 Rxd1+ 35. Kf2 Nxd5 36. Qxa7 Qb6+ 37. Kg3 Qxa7 38. Rxa7 Bf5 39. a4 Rd3+ 40.
Nf3 Kf8 41. a5 Ke8 42. Kf2 Nxf4 43. Ng5 Ra3 44. Nf7 d5 45. Nd6+ Kd8 46. Nf7+
Kc8 47. Nd6+ Kb8 48. Rb7+ Ka8 49. Rf7 Ra2+ 50. Ke3 Nxg2+ 51. Kd4 Rxa5 52. Nxf5
gxf5 53. Rxf5 Ra4+ 54. Kc3 Nf4 55. Kb3 Re4 56. Rf7 d4 57. Kc4 d3+ 58. Kc3 Kb8
59. Rh7 Re2 60. Rh1 Kb7 61. Kd4 Kb6 62. Ra1 Kb5 63. Rb1+ Ka4 64. Kc3 Rc2+ 65.
Kd4 d2 66. Ra1+ Kb3 67. Rd1 Ne6+ 68. Ke3 Kc3 69. Ra1 Nc5 0-1

[Event "Toga-Rybka f7-pawn"]
[Site "?"]
[Date "2007.07.21"]
[Round "1"]
[White "Toga II 1.2.1a"]
[Black "Rybka 2.3.2a 32-bit"]
[Result "1/2-1/2"]
[WhiteElo "2920"]
[BlackElo "3070"]
[SetUp "1"]
[FEN "rnbqkbnr/ppppp1pp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQk - 0 1"]
[PlyCount "126"]
[EventDate "2007.07.21"]
[EventType "tourn"]
[Source "Buczyna"]

1. e4 e6 2. d4 Nc6 3. d5 exd5 4. exd5 Ne5 5. Qe2 Qe7 6. Nc3 Nf6 7. Bf4 d6 8.
O-O-O Ng6 9. Qc4 Nxf4 10. Qxf4 Qd8 11. Bb5+ Bd7 12. Re1+ Be7 13. Qe3 Kf7 14.
Nf3 Re8 15. Ng5+ Kg8 16. Ne6 Qc8 17. Qg3 Bf8 18. Bxd7 Qxd7 19. Ne4 Nxe4 20.
Rxe4 c6 21. Qb3 cxd5 22. Qxd5 Qc6 23. Rd1 Rac8 24. c3 Qxd5 25. Rxd5 Kf7 26.
Rf5+ Kg8 27. f4 Be7 28. Rd5 Kf7 29. g4 h6 30. f5 Rc6 31. Rb5 Rb8 32. Reb4 b6
33. Ra5 Rb7 34. Rd5 a6 35. Kc2 Rb8 36. Rbd4 b5 37. h3 Rcb6 38. Nf4 Bf6 39. Re4
b4 40. c4 b3+ 41. axb3 Rxb3 42. Nd3 Bxb2 43. Rxd6 Bf6 44. Rxa6 Rc3+ 45. Kd2
Rbb3 46. Rd6 Bg5+ 47. Ke2 Rc2+ 48. Kf3 Rcc3 49. Rd7+ Kf8 50. Red4 Bf6 51. R4d6
Rxc4 52. Ra7 Kg8 53. Rdd7 Rcc3 54. Ke4 Rc4+ 55. Ke3 h5 56. Rac7 Ra4 57. Rc8+
Kh7 58. Rf8 Bg5+ 59. Kf3 hxg4+ 60. hxg4 Rf4+ 61. Kg3 Re4 62. Kf2 Rxg4 63. Kf3
Rc4 1/2-1/2

[Event "R11-Rybka f7-pawn"]
[Site "?"]
[Date "2007.07.21"]
[Round "1"]
[White "Rybka 1.1 32-bit"]
[Black "Rybka 2.3.2a 32-bit"]
[Result "1-0"]
[WhiteElo "3020"]
[BlackElo "3070"]
[SetUp "1"]
[FEN "rnbqkbnr/ppppp1pp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQk - 0 1"]
[PlyCount "159"]
[EventDate "2007.07.21"]
[EventType "tourn"]
[Source "Buczyna"]

1. e4 e6 2. Nc3 c5 3. Nf3 Nc6 4. Be2 Nf6 5. O-O Be7 6. d4 cxd4 7. Nxd4 O-O 8.
Be3 d5 9. exd5 exd5 10. a3 Bd6 11. Re1 Re8 12. h3 a6 13. Bf3 Be5 14. Qd2 Qd6
15. Rad1 h6 16. b4 Bd7 17. Nde2 d4 18. Nxd4 Nxd4 19. Bxd4 Bxd4 20. Nd5 Rxe1+
21. Rxe1 Bxf2+ 22. Kxf2 Kf7 23. c4 Bc6 24. c5 Qd8 25. Re5 Bxd5 26. Bxd5+ Qxd5
27. Rxd5 Ne4+ 28. Ke3 Nxd2 29. Rxd2 Re8+ 30. Kf4 Re7 31. a4 Ke8 32. Rd6 Re2 33.
Kf3 Rc2 34. Rb6 a5 35. Rxb7 axb4 36. Rxg7 Rxc5 37. Rb7 Rc4 38. a5 Rc3+ 39. Kg4
Ra3 40. Kh5 b3 41. Kxh6 Kd8 42. Kg7 Ke8 43. a6 Kd8 44. a7 Ra5 45. a8=Q+ Rxa8
46. Rxb3 Ra7+ 47. Kh8 Ke7 48. g4 Kf6 49. h4 Ra6 50. Kh7 Ra7+ 51. Kh6 Ra8 52.
g5+ Kf5 53. Rb5+ Kg4 54. Rb4+ Kf5 55. g6 Rh8+ 56. Kg7 Rd8 57. Kh7 Rd7+ 58. g7
Kf6 59. Rf4+ Ke5 60. Rf8 Kd4 61. Kh6 Rd6+ 62. Kg5 Rd5+ 63. Kg4 Kc5 64. Rc8+ Kb4
65. Rb8+ Kc3 66. Rc8+ Kd4 67. Kf4 Rh5 68. Rd8+ Kc3 69. Rc8+ Kd4 70. Rh8 Re5 71.
Rd8+ Rd5 72. Rxd5+ Kxd5 73. h5 Kd6 74. h6 Kc6 75. g8=Q Kb5 76. Ke4 Ka5 77. h7
Ka4 78. h8=Q Ka3 79. Qb8 Ka2 80. Qbb2# 1-0

[Event "R12n-Rybka f7-pawn"]
[Site "?"]
[Date "2007.07.21"]
[Round "1"]
[White "Rybka 1.2n 32-bit"]
[Black "Rybka 2.3.2a 32-bit"]
[Result "1-0"]
[WhiteElo "3060"]
[BlackElo "3070"]
[SetUp "1"]
[FEN "rnbqkbnr/ppppp1pp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQk - 0 1"]
[PlyCount "197"]
[EventDate "2007.07.21"]
[EventType "tourn"]
[Source "Buczyna"]

1. e4 e6 2. Nc3 c5 3. Nf3 Nc6 4. Be2 Nf6 5. O-O Be7 6. d4 cxd4 7. Nxd4 O-O 8.
Be3 d5 9. exd5 exd5 10. a3 Bd6 11. Re1 Re8 12. Qd2 Bg4 13. Bb5 Qd7 14. f3 Bh5
15. Kh1 a6 16. Ba4 Be5 17. Nce2 Rac8 18. c3 Qc7 19. Bf4 Nd7 20. Nf5 Kh8 21.
Bxe5 Ndxe5 22. Ned4 Bg6 23. Nh4 Bf7 24. Qf4 Qe7 25. Re3 Qf8 26. Rf1 b5 27. Nxc6
Nxc6 28. Bc2 Rxe3 29. Qxe3 Re8 30. Qf2 Ne5 31. Kg1 Kg8 32. Nf5 Bg6 33. Nd4 Bxc2
34. Qxc2 Nc4 35. Qf2 Qe7 36. Rc1 Kf7 37. g3 Kg8 38. f4 Qe4 39. b3 Nxa3 40. Nf3
h6 41. Re1 Qg6 42. Rxe8+ Qxe8 43. Ne5 Qe6 44. Qd4 Nc2 45. Qd2 Na3 46. Qc1 Qd6
47. Qe3 Nc2 48. Qa7 Kh7 49. Qf2 Na3 50. Qd4 Qe6 51. g4 b4 52. cxb4 Nb5 53. Qe3
g6 54. Kg2 Kg7 55. h4 Kg8 56. g5 h5 57. Qc5 Kg7 58. Qc2 Kh7 59. Qc6 Qxc6 60.
Nxc6 Kg7 61. f5 gxf5 62. Ne7 d4 63. Nxf5+ Kg6 64. Ne7+ Kg7 65. Nc6 d3 66. Kf2
Nd6 67. Nd4 Ne4+ 68. Ke3 d2 69. Ke2 Kf7 70. Kd1 Kg6 71. Kc2 Nc3 72. Kxd2 Nd5
73. Kd3 Nf4+ 74. Ke4 Ng2 75. Nf3 Kf7 76. Kd5 Ke7 77. Kc6 Nf4 78. Kb6 Nd3 79.
Kxa6 Nxb4+ 80. Kb5 Nd3 81. b4 Ke8 82. Ka5 Kf8 83. b5 Nc5 84. Kb6 Ne6 85. Ka7
Nd8 86. Ne5 Ke8 87. b6 Nb7 88. Kxb7 Ke7 89. Ka7 Ke6 90. g6 Ke7 91. g7 Kf6 92.
g8=Q Kxe5 93. Qh8+ Ke4 94. Qxh5 Kd3 95. Qf3+ Kd4 96. b7 Kc4 97. b8=Q Kc5 98.
Qbf4 Kb5 99. Qd5# 1-0

[Event "ZZ-Rybka f7-pawn"]
[Site "?"]
[Date "2007.07.21"]
[Round "1"]
[White "Zap!Chess Zanzibar"]
[Black "Rybka 2.3.2a 32-bit"]
[Result "1-0"]
[WhiteElo "2920"]
[BlackElo "3070"]
[SetUp "1"]
[FEN "rnbqkbnr/ppppp1pp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQk - 0 1"]
[PlyCount "125"]
[EventDate "2007.07.21"]
[EventType "tourn"]
[Source "Buczyna"]

1. e4 e6 2. d4 Nc6 3. Nf3 d5 4. Nc3 Bb4 5. e5 Nge7 6. Bd3 Nf5 7. O-O O-O 8. Ne2
Be7 9. c3 Kh8 10. Ng3 Bd7 11. Qc2 h6 12. Nxf5 exf5 13. Re1 Be6 14. b4 f4 15. a4
Bg4 16. Qd1 Be6 17. Ba3 Qd7 18. Qe2 Kg8 19. b5 Na5 20. Bb4 Bxb4 21. cxb4 Nc4
22. Nh4 g5 23. Ng6 Rfe8 24. h4 Bg4 25. Qc2 Bh5 26. e6 Rxe6 27. hxg5 hxg5 28.
Ne5 Qe7 29. Bf5 Rxe5 30. dxe5 Nxe5 31. Bd7 Nf3+ 32. gxf3 Qxd7 33. Rac1 Rf8 34.
Re5 Qg7 35. Qxc7 Bxf3 36. Qd6 Qf6 37. Qxf6 Rxf6 38. Rxg5+ Kh7 39. Rc3 Kh6 40.
Rg8 Bh5 41. Rc7 Bf3 42. Rxb7 Re6 43. Kf1 Re4 44. Rxa7 Rxb4 45. Ra6+ Kh5 46. Re8
Kg4 47. Re7 d4 48. Ke1 Kf5 49. Rae6 Rxa4 50. Re5+ Kf6 51. R7e6+ Kf7 52. Rd6 d3
53. Rxd3 Be4 54. Rd6 Bf3 55. Kd2 Ra2+ 56. Kc3 Ra1 57. Rd4 Kg6 58. Rxf4 Bb7 59.
Re7 Ba8 60. Re6+ Kg5 61. Rf8 Bb7 62. Re7 Bh1 63. Rg7+ 1-0

[Event "H10-Rybka f7-pawn"]
[Site "?"]
[Date "2007.07.22"]
[Round "1"]
[White "Hiarcs 10"]
[Black "Rybka 2.3.2a 32-bit"]
[Result "1/2-1/2"]
[WhiteElo "2890"]
[BlackElo "3070"]
[SetUp "1"]
[FEN "rnbqkbnr/ppppp1pp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQk - 0 1"]
[PlyCount "231"]
[EventDate "2007.07.22"]
[EventType "tourn"]
[Source "Buczyna"]

1. e4 e6 2. d4 Nc6 3. Nh3 Nf6 4. e5 Nd5 5. Bd3 g6 6. c3 d6 7. exd6 Bxd6 8. O-O
O-O 9. Bh6 Re8 10. Nd2 Bf8 11. Bg5 Qd7 12. Nc4 Bg7 13. f4 b6 14. Qe2 Rf8 15.
Rae1 a6 16. Ne5 Nxe5 17. fxe5 Bb7 18. Nf2 Nf4 19. Bxf4 Rxf4 20. Ng4 Rxf1+ 21.
Rxf1 b5 22. Nf6+ Bxf6 23. exf6 Qf7 24. Qe5 Rd8 25. g4 Rd5 26. Qe3 Rd7 27. g5
Rd6 28. h4 Bc6 29. Qg3 Be8 30. Rf2 b4 31. Be4 Kf8 32. Qe5 Bc6 33. cxb4 Bxe4 34.
Qxe4 Rd5 35. a3 Qd7 36. Rf4 Kf7 37. Qe3 Qb5 38. Re4 Qc6 39. Qc3 Qd6 40. Kg2 Qb6
41. Kh3 Qd6 42. Qe3 Qd7 43. Kh2 Qc6 44. Kg3 Qd6+ 45. Kg2 Qb6 46. Kh3 Qd6 47. b3
Qd7 48. Kh2 Qd6+ 49. Kg2 Qc6 50. Kg1 Qd6 51. Kh1 Rf5 52. Kg2 Qc6 53. Kg1 Qb5
54. Rf4 Rxf4 55. Qxf4 Qc6 56. Qe3 Qc2 57. a4 Qf5 58. a5 Qg4+ 59. Kf1 Qd1+ 60.
Kf2 Qh1 61. b5 axb5 62. Qf4 Qc6 63. a6 Qc2+ 64. Kg3 Qd3+ 65. Kh2 Qc2+ 66. Kh3
Qd3+ 67. Qg3 Qf1+ 68. Kh2 Qe2+ 69. Kg1 Qc2 70. b4 Qc1+ 71. Kg2 Qc6+ 72. Kh2 Qc4
73. Qf4 Qc2+ 74. Kg3 Qd3+ 75. Kg4 Qd1+ 76. Qf3 Qxd4+ 77. Kh3 Kg8 78. Qe2 Kf7
79. Qxb5 Qe3+ 80. Kg2 Qd2+ 81. Kf3 Qc3+ 82. Ke2 Qc2+ 83. Kf1 Qd1+ 84. Kf2 Qd2+
85. Qe2 Qxb4 86. Kg3 Qd4 87. Qb5 Qg1+ 88. Kf3 Qd1+ 89. Qe2 Qh1+ 90. Kg4 Qg1+
91. Kh3 Qh1+ 92. Kg3 Qg1+ 93. Qg2 Qd1 94. Qf3 Qd6+ 95. Qf4 Qd3+ 96. Kf2 Qc2+
97. Ke1 Qb1+ 98. Ke2 Qc2+ 99. Qd2 Qe4+ 100. Qe3 Qc2+ 101. Ke1 Qb1+ 102. Kf2
Qa2+ 103. Qe2 Qa4 104. Kg1 Qxh4 105. Qe5 Qg4+ 106. Kf2 Qh4+ 107. Kf3 Qc4 108.
Qa5 Qd3+ 109. Kf2 Qd4+ 110. Ke1 Qe3+ 111. Kf1 Qd3+ 112. Kf2 Qd4+ 113. Kf3 Qd3+
114. Kf4 Qd4+ 115. Kg3 Qe3+ 116. Kg4 1/2-1/2

[Event "GF-Rybka f7-pawn"]
[Site "?"]
[Date "2007.07.22"]
[Round "1"]
[White "Gambit Fruit 1.0 Beta 4bx"]
[Black "Rybka 2.3.2a 32-bit"]
[Result "1-0"]
[WhiteElo "2870"]
[BlackElo "3070"]
[SetUp "1"]
[FEN "rnbqkbnr/ppppp1pp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQk - 0 1"]
[PlyCount "153"]
[EventDate "2007.07.22"]
[EventType "tourn"]
[Source "Buczyna"]

1. e4 e6 2. Nc3 c5 3. Nf3 Nc6 4. Bb5 Bd6 5. Bxc6 bxc6 6. e5 Bc7 7. O-O Ne7 8.
Ne4 O-O 9. Nxc5 d6 10. exd6 Qxd6 11. Ne4 Qd5 12. d3 Ng6 13. Be3 Nf4 14. Bc5 Rf7
15. Kh1 e5 16. Nfg5 Rf5 17. g3 Rxg5 18. c4 Qd8 19. Nxg5 Qxg5 20. gxf4 Qxf4 21.
Rg1 Bf5 22. Be3 Qh4 23. Rg2 g6 24. Bg5 Qd4 25. Qf3 Qd7 26. Rd1 Re8 27. Qe3 e4
28. Re1 Ba5 29. Re2 Bh3 30. Rg1 Be6 31. dxe4 Bxc4 32. f3 Bxe2 33. Qxe2 Bc7 34.
Rd1 Qh3 35. Qg2 Qe6 36. b3 Qe5 37. Rc1 Qe6 38. Rf1 a5 39. Rd1 Rb8 40. Be3 Rb5
41. Bf2 a4 42. Bg3 axb3 43. Bxc7 bxa2 44. Qd2 Qf7 45. Qd8+ Qf8 46. Kg2 Qxd8 47.
Rxd8+ Kf7 48. Ra8 Rb2+ 49. Kg3 g5 50. Kg4 Kf6 51. Ra6 Rg2+ 52. Kh5 Rc2 53. h3
Rc3 54. Rxa2 Rxf3 55. h4 gxh4 56. Kxh4 Re3 57. Ra4 Rc3 58. Bf4 Rc5 59. Rd4 Kf7
60. Kg3 Ke8 61. Rd6 Rc4 62. Kf3 c5 63. e5 Rb4 64. Bg5 h6 65. Rxh6 Kf8 66. e6
Kg7 67. Rf6 Rb7 68. Kg4 c4 69. Rf3 Rb4 70. e7 c3+ 71. Kh5 Re4 72. Bh6+ Kh7 73.
Re3 Ra4 74. e8=Q Ra5+ 75. Bg5 Rf5 76. Re7+ Rf7 77. Rxf7# 1-0

[Event "F9-Rybka f7-pawn-1"]
[Site "?"]
[Date "2007.07.22"]
[Round "1"]
[White "Fritz 9"]
[Black "Rybka 2.3.2a 32-bit"]
[Result "1-0"]
[WhiteElo "2895"]
[BlackElo "3070"]
[SetUp "1"]
[FEN "rnbqkbnr/ppppp1pp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQk - 0 1"]
[PlyCount "145"]
[EventDate "2007.07.22"]
[EventType "tourn"]
[Source "Buczyna"]

1. e4 e6 2. d4 Nc6 3. d5 exd5 4. exd5 Ne5 5. Qe2 Qe7 6. Nc3 Nf6 7. Bf4 d6 8.
O-O-O Ng6 9. Qc4 Nxf4 10. Qxf4 Qd8 11. Bb5+ Bd7 12. Qe3+ Be7 13. Re1 Kf7 14.
Nh3 Re8 15. Ng5+ Kg8 16. Qd3 Bxb5 17. Nxb5 Qd7 18. Qb3 a5 19. a4 Rac8 20. f4
Kh8 21. Re6 Nh5 22. Qf3 Bxg5 23. fxg5 g6 24. Rxe8+ Qxe8 25. Rf1 Kg8 26. g4 Ng7
27. Nc3 Qf8 28. Qe2 Qe8 29. Ne4 Kh8 30. Qf3 Qe7 31. Qf6 Qe8 32. h4 Kg8 33. Kb1
Qf8 34. Rf2 Qxf6 35. gxf6 h6 36. c4 Rd8 37. Kc2 Rd7 38. fxg7 Kxg7 39. Kd3 Rd8
40. h5 gxh5 41. gxh5 b6 42. Rg2+ Kf7 43. Rg6 Rh8 44. Re6 Kf8 45. Nxd6 cxd6 46.
Rxd6 Ke7 47. Rxb6 Kd7 48. c5 Kc8 49. Kc4 Rh7 50. c6 Re7 51. d6 Re1 52. d7+ Kc7
53. Rb8 Rd1 54. Kc5 Kxb8 55. Kb6 Rd6 56. d8=R+ Rxd8 57. c7+ Kc8 58. cxd8=R+
Kxd8 59. Kxa5 Kc7 60. Kb5 Kd7 61. a5 Kc7 62. a6 Kb8 63. Kb6 Ka8 64. b4 Kb8 65.
Kc6 Ka7 66. b5 Kb8 67. b6 Ka8 68. b7+ Kb8 69. a7+ Kxa7 70. Kc7 Ka6 71. b8=Q Ka5
72. Qb3 Ka6 73. Qa4# 1-0

[Event "S9-Rybka f7-pawn"]
[Site "?"]
[Date "2007.07.23"]
[Round "1"]
[White "Shredder 9"]
[Black "Rybka 2.3.2a 32-bit"]
[Result "0-1"]
[WhiteElo "2870"]
[BlackElo "3070"]
[SetUp "1"]
[FEN "rnbqkbnr/ppppp1pp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQk - 0 1"]
[PlyCount "144"]
[EventDate "2007.07.23"]
[EventType "tourn"]
[Source "Buczyna"]

1. e4 e6 2. d4 Nc6 3. Nf3 d5 4. Bb5 dxe4 5. Ne5 Bd7 6. Bxc6 Bxc6 7. Qh5+ g6 8.
Nxg6 Nf6 9. Qh3 hxg6 10. Qxh8 Qxd4 11. Nc3 Kf7 12. Be3 Qe5 13. O-O-O b5 14. Qh3
b4 15. Ne2 Qf5 16. Qg3 e5 17. h3 a5 18. Rd2 a4 19. Kb1 Be7 20. Rhd1 Rh8 21. Ka1
Nh5 22. Qh2 Qe6 23. c4 g5 24. g3 Nf6 25. h4 Ng4 26. Qg2 Qf5 27. Qg1 gxh4 28.
gxh4 Qf3 29. Ng3 Rxh4 30. Qe1 Kg6 31. Re2 Rh2 32. Nf1 Rh1 33. Qd2 Rh8 34. Rde1
a3 35. b3 Rh7 36. Qd1 Kf7 37. Nd2 Qf5 38. Qc1 Rh3 39. Ba7 e3 40. fxe3 Qd3 41.
Nb1 Bf3 42. Rd2 Qf5 43. Rf1 e4 44. Rd5 Qc8 45. Nd2 c6 46. Rd4 Bf6 47. Kb1 Nxe3
48. Nxf3 Nxf1 49. Ng5+ Bxg5 50. Qxg5 Ne3 51. Qf4+ Qf5 52. Qc7+ Kg6 53. Rd6+ Kh5
54. Bxe3 Rxe3 55. Rd1 Rh3 56. Qg7 e3+ 57. Ka1 e2 58. Re1 Rh4 59. c5 Qf2 60.
Qh7+ Kg5 61. Qg8+ Kf4 62. Qc4+ Kf3 63. Qd3+ Qe3 64. Qf5+ Rf4 65. Qc2 Kf2 66.
Rd1 Qc3+ 67. Kb1 Qxc2+ 68. Kxc2 exd1=Q+ 69. Kxd1 Ke3 70. Kc2 Rf5 71. Kd1 Rxc5
72. Ke1 Rc1# 0-1

[Event "Fruit06"]
[Site "?"]
[Date "2007.08.01"]
[Round "1"]
[White "Fruit 061115a"]
[Black "Rybka 2.3.2a 32-bit"]
[Result "1-0"]
[WhiteElo "2950"]
[BlackElo "3070"]
[SetUp "1"]
[FEN "rnbqkbnr/ppppp1pp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQk - 0 1"]
[PlyCount "159"]
[EventDate "2007.07.31"]
[EventType "tourn"]
[Source "Buczyna"]

1. e4 e6 2. d4 Nc6 3. Nc3 Bb4 4. Nf3 d5 5. Bd3 dxe4 6. Bxe4 Nf6 7. Bg5 O-O 8.
Qd3 h6 9. Bh4 Bd6 10. Bxc6 bxc6 11. Ne4 Be7 12. Bxf6 gxf6 13. O-O f5 14. Nc5
Bxc5 15. dxc5 Qxd3 16. cxd3 Rb8 17. b3 Rb5 18. d4 Rd8 19. Rfe1 a5 20. Ne5 Bb7
21. Rad1 a4 22. bxa4 Rb4 23. Nf3 Bc8 24. a5 Ra4 25. Ne5 Bb7 26. Rb1 Ba8 27. Nf3
Re8 28. Rb2 Rxa5 29. Ra1 Rb5 30. Rbb1 Reb8 31. Re1 Kf7 32. a4 Ra5 33. Re2 Kf6
34. g3 Rb3 35. Re3 Rb8 36. h3 Rd8 37. Rb3 e5 38. dxe5+ Ke7 39. Rc3 Rd5 40. Rc4
Rdxc5 41. Rf4 Rc3 42. Nh4 Ke6 43. Rxf5 Rac5 44. Kh2 Rc1 45. Rxc1 Rxc1 46. Rf8
Bb7 47. Ng6 c5 48. Rf6+ Kd5 49. g4 c4 50. e6 c3 51. e7 Re1 52. Rf3 Bc6 53. Rxc3
Be8 54. Nf4+ Kd6 55. Rd3+ Kxe7 56. Ra3 Re4 57. Nd5+ Kd6 58. Nf6 Re2 59. Nxe8+
Rxe8 60. a5 Ra8 61. a6 Ra7 62. f4 Ke6 63. Kg3 c5 64. Kf3 Kd5 65. Ke3 c4 66. f5
c3 67. Kd3 Kc5 68. Kxc3 Kb5 69. f6 Kc6 70. f7 Ra8 71. a7 h5 72. gxh5 Kc7 73.
f8=Q Rxf8 74. a8=Q Rf6 75. Ra7+ Kd6 76. Qe4 Re6 77. Qd4+ Kc6 78. Kc4 Re5 79.
Qd7+ Kb6 80. Qb7# 1-0
Parent - By Gaмßito (****) Date 2007-08-01 21:29
Thanks for all this games Turbo.

Is very interesting to see Rybka performance playing without the f7 pawn against other strong engines.

In the match against Joël,  I hope is to see a very interesting match, and I believe that it is the most difficult match that Rybka has had at some time. We will see what happen.

Regards,
Gambito.
Parent - - By lkaufman (*****) Date 2007-08-01 22:40
     The f7 handicap is much more difficult than any other pawn handicap; according to Rybka evals, it is roughly double the average of the other 7 we will use in this match. So I'm surprised that Rybka did this well against such opposition at 40/2. Based on these results, I would say that Rybka would score no less than 50% against the same opponents if you had used all eight pawn handicaps. So in terms of math, Joel should have no chance. But I don't believe it will be so easy for Rybka as these stats would indicate; Joel knows he is playing with an extra pawn and will avoid unnecessary complications; the engines don't care about this.
     If you are right and Joel loses badly, we might have to consider pawn and move (f7) against a GM next, though this should be very tough; the initial position is almost certainly a forced win for White, and there is no defense to 1e4 that gives Black a decent position if White plays the opening well.
Parent - - By Vasik Rajlich (Silver) Date 2007-08-03 11:26
Larry,

IIRC, part of black's problems in the f7+move handicap is that there is no good defense for black to 1. e4. I see that a lot of these games started 1. e4 e6 2. d4 Nc6 3. Nf3. Perhaps white has something better than this.

Vas
Parent - - By turbojuice1122 (Gold) Date 2007-08-03 16:25
I think that the first game with Fritz 10 pretty much illustrates how white can successfully play this position and win quickly--it plays early h4, g4 and then kingside attack, winning in 33 moves (and really obtaining a completely and obviously winning position well before the 20th move).  Somehow, Joel must be prevented from being able to enact this strategy, if possible.  It would seem that against a well-prepared, good-attacking player, f7+move handicap might be more difficult to defend than knight handicap, though most engines don't play this correctly.
Parent - - By lkaufman (*****) Date 2007-08-04 04:13 Edited 2007-08-04 04:19
     I'm sorry to say, since I'm normally reserved in my comments, that your last statement is ridiculous (I don't mean to offend). The f7 handicap is indeed quite difficult for Black, much worse than just a pawn, but a piece is a piece! I have tremendous experience with handicap play, both personally and with computers, and I can tell you with 100% confidence that the f7 handicap is at the very most half as large a handicap as knight odds, no matter who the players are (unless we're talking about beginners). In fact, one handicap which was occasionally tried a couple centuries ago, and which I have also tried with Rybka, is for Rybka to give knight odds but I give back the f7 pawn as "change". It's hard to say for sure, but I would have more confidence against Rybka this way than with Rybka giving me the f7 handicap.
     I believe we will be able to give some grandmaster (maybe just a 2500 level one) the f7 handicap in a serious match within a year or so and be competitive, but there is no way any program will ever have a chance giving knight odds to any grandmaster in a slow match. In the opening, a piece is worth nearly 4 pawns!
Parent - - By Uri Blass (*****) Date 2007-08-04 13:53
I agree that knight is clearly more than pawn f7.
I think that it may be interesting to know what fide rating at slow time control rybka can get with knight handicap or rook handicap.

Note that a poker player lost 60,000$ after losing a bet that he can beat an international master with a rook handicap
http://forumserver.twoplustwo.com/showflat.php?Cat=0&Number=10970199&page=0&fpart=1&vc=1

Uri
Parent - - By lkaufman (*****) Date 2007-08-04 16:33
     Unfortunately the article gave no information about the rating of the losing poker player. Anyway I can tell you approximately what rating I would have (instead of my "real" rating of almost 2400) if I played at knight or rook handicap, since I do it all the time. Usually my games are at a pace similar to FIDE rapid (like 25' +10") so some allowance must be made for this. At that pace, my own rating would be about 1850 at knight odds and 1650 at rook odds (and maybe 1050 at queen odds), give or take fifty points or so. At 40/2, I would estimate that my rating at these handicaps would be perhaps a hundred points lower.
     How much higher these numbers would be for Rybka is an interesting question; my guess would be roughly a class (200 pts) higher, assuming we set a high contempt factor and prepare a small opening book. In true blitz play (5' no increment), Rybka on a quad performs at least fairly close to 2400 giving knight odds.
Parent - - By Vasik Rajlich (Silver) Date 2007-08-05 13:32
That's an interesting question.

I'd bet on Rybka vs 2050 FIDE player at knight odds with 25' + 10". This is based on watching Iweta play such games with a faster time control.

Vas
Parent - - By lkaufman (*****) Date 2007-08-05 15:08
Yes, now that I think about all the games at knight odds I have seen Rybka play, I will revise my above estimates upward by 100 points.
Parent - - By insipid (**) Date 2007-08-05 18:47
I'm ~2030 USCF, I've played some semi-serious knight odds games against Rybka, and at the same time, even at something like game in 60, I find it very hard!  Even with white, wins are not guaranteed, and losses are always possible.  With black it is a terrible struggle to draw - this is on against a dual-core laptop.  I'd say a draw is the most common result but I wouldn't bet on myself to win a knight odds match against Rybka on your hardware, even if I got white half the time, no way.
Parent - By lkaufman (*****) Date 2007-08-05 19:29
     Unless otherwise stated, knight odds always means that the odds-giver has White. So your statement is pretty consistent with my 2150 estimate for Rybka at knight odds in rapid play; maybe I'm being too conservative still.
Parent - - By turbojuice1122 (Gold) Date 2007-08-04 14:36
I guess I should have been more clear in my last statement.  Obviously, objectively speaking, there is no question that a knight handicap will be won far more often than f7+move handicap--countless tests have proven this, and on my machine, pretty much any CEGT-2500-rated program will beat Rybka with a knight handicap, but will lose with f7+move handicap.

However, the path to victory seems clearer with the f7+move handicap--if white is a good attacking player (one of my necessary conditions for the statement to even have a prayer of occasionally having validity) white can quickly start an attack (such as in the Fritz 10 game) while keeping black's kingside destroyed.  Of course, black can set himself up for a quick queenside castle, which might be the way to go, but I still think that white's game can be more straightforward here.  Of course, with the advantage being smaller, it's easier to blunder it away than with the knight odds.  However, with the knight odds, king safety is easy to attain for the side down the knight, and so the path to victory seems a bit less straightforward (and possibly longer), even though the advantage is larger.
Parent - - By lkaufman (*****) Date 2007-08-04 16:37
     I still have to disagree with you. At knight odds the path to victory is very clear; just trade pieces! At pawn and move (f7) this won't work well; you have to attack, which means you have to calculate many variations. It requires far more skill, regardless of "style". Don't underestimate the power of good defense. The games you have seen don't mean much, because Rybka had no book and played the early opening poorly.
Parent - - By turbojuice1122 (Gold) Date 2007-08-04 16:42
The games you have seen don't mean much, because Rybka had no book and played the early opening poorly.

Yes, I should have added that I'll definitely need to keep an eye on that particular game with Joel to see what sort of path you have Rybka take with your opening book and how he reacts to it.
Parent - - By lkaufman (*****) Date 2007-08-04 16:54
Actually, there are four or five half-decent ways for Black to play this handicap opening, but combining ...e6 and ...Nc6 in the first two moves isn't one of them.
Parent - - By Lord Nemesis (*) Date 2007-09-12 09:00
Hello,

Indeed, yesterday I played and won a game at pawn-odds (f7) against Rybka and won against its ...Nc6 and ...e6 opening, so what are the sound openings answers to 1. e4 in this handicap opening ? Because the program does not want to play anything else...
Parent - By lkaufman (*****) Date 2007-09-12 13:27
1...e6 2d4 d5, 1...d6 2d4 Nf6, 1...Nc6 2d4 d5, 1...Nh6 2d4 Nf7 are probably the best four defenses.
Parent - - By lkaufman (*****) Date 2007-09-12 19:16
Despite the poor opening for Black, this is an amazing achievement for a player who has had no experience playing "real" chessplayers. I've only managed one win at the handicap myself, and GM Joel Benjamin could only score one draw in three tries (at 5'+10") even with an extra move as White! Can you supply some details about the time limits (for both sides), the version (2.3.2a I suppose) and the hardware? In the opening position how many nodes per second does your computer examine?
Parent - - By Lord Nemesis (*) Date 2007-09-14 12:05
The time limits were 40'' / 40 + 40'' / 40 + 40'' — 2h would be more "serious" but it bores me, the computer uses all his time and me not, so... You are right for the version; for the hardware, I use a one-year-old Intel Pentium M processor 735A 1.7 Ghz 400 Mhz FSB (I hope it helps you, because I do not know at all the meaning of all these things...!). In the opening, my computer examine 40 kN/s.
Parent - - By Lord Nemesis (*) Date 2007-09-14 12:08
Hem, now it marks 55 kN/s ... After how many time should I tell you the results ?
Parent - - By lkaufman (*****) Date 2007-09-14 12:26
Just an average figure over a minute or two is okay. That number sounds fine for your hardware, so at least nothing appears to be wrong. On a quad we get nearly ten times the speed, but still your result is quite an achievement.
Parent - - By Lord Nemesis (*) Date 2007-09-14 12:28
Ten times ! How many Elo points difference does it make ?
Parent - By turbojuice1122 (Gold) Date 2007-09-14 12:58
Ten times speed --> elo difference = (70 points)*(ln(10))/(ln(2)) = 233 points
Parent - - By insipid (**) Date 2007-08-05 18:52
"At knight odds the path to victory is very clear; just trade pieces!"

You make it sound so easy - when playing against Rybka it is not! Rybka has a great sense of how to play in such situations and a weak expert like me cannot trick it into trading! 

No doubt knight odds is way bigger than pawn odds .. you can lose a pawn here, lose a pawn there, then get outplayed in the endgame, and still draw!  But getting the beast to agree to piece trades without making some major concession seems nearly impossible to someone at my level.
Parent - By lkaufman (*****) Date 2007-08-05 19:32
Yes, I know it's difficult even for an Expert to beat Rybka at knight odds. But at least you have a clear plan, and you can afford to make mild concessions to simplify. When the handicap is just the f7 pawn, it's extremely difficult even for an IM like me at any reasonably rapid pace.
Parent - By Lord Nemesis (*) Date 2007-09-12 09:13
Funny, I have almost the same opening that Fritz... Except that I shot dead the knight when it went back to h6.
Parent - By lkaufman (*****) Date 2007-08-04 04:17
Obviously Black's first two moves are not the best way to play this handicap; no human player in recorded history has opened this way at pawn and move. Rybka just has this fetish about early knight moves. Of course I won't mention now what is planned here for the match, but I'll just say that after 1e4 Black will get a poor position a pawn down no matter what she plays, but White will not get any easy win straight out of the opening.
Up Topic Rybka Support & Discussion / Rybka Discussion / Long games, pawn and move

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