Author: pete
Date: 07:59:22 08/13/00
For my personal pleasure I have played a little match Crafty-Tiger, both without opening book and tablebases , Time control 40 in 40 ; Tiger on a PIII500 , Crafty on 4 Ultra-Sparc 450 CPUs . Two interesting positions : a.) [D]3r1rk1/2p1Rppp/p4n2/1p1b4/3P4/3B3P/PPPN2P1/4R1K1 b - - 0 1 Here Tiger played what seems to be the decisive mistake 21. ... Bxa2 ?? This is an interesting move IMHO as the bishop doesn't get lost at all , it simply can't participate in the game anymore ; in fact it lasts until the 46th move when white finally wins the bishop . It seems to me without special code it is impossible to avoid this ( for example Fritz 6a would play like that too) . Is it possible to survive after Bxa2 ? Which programs will avoid Bxa2 ? The complete game : Tournament: 40 in 40 Date: 13/8/2000 White: Crafty 17.12 Black: Chess Tiger 12.0e Opening: French ( Exchange) 1. e4 e6 2. Nf3 d5 3. exd5 exd5 4. d4 Bd6 5. Nc3 Nf6 6. Bd3 Qe7+ 7. Be3 Bf4 8. Qe2 Bxe3 9. Qxe3 Qxe3+ 10. fxe3 a6 11. e4 dxe4 12. Nxe4 Nxe4 13. Bxe4 0-0 14. 0-0 Nd7 15. Rae1 Nf6 16. Bd3 Bd7 17. Re5 Rad8 18. Rfe1 Be6 19. h3 Bd5 20. Nd2 b5 21. Re7 Bxa2 22. b3 Nd5 23. R7e4 Nb4 24. Ra1 f5 25. Rf4 g6 26. Bf1 c5 27. c4 Rxd4 28. Rxd4 cxd4 29. cxb5 axb5 30. Bxb5 Kg7 31. Kf2 Rb8 32. Bc4 Rb6 33. Re1 Kf8 34. Re5 h6 35. h4 h5 36. Kf3 Kg7 37. Re7+ Kh6 38. Kf4 Rb8 39. Nf3 Nc6 40. Rd7 Re8 41. Rc7 Re4+ 42. Kg3 Ne7 43. Nd2 Re3+ 44. Kf4 Re1 45. Ra7 Bb1 46. Nxb1 Nc6 47. Rc7 Re4+ 48. Kg3 Ne5 49. Nd2 Rg4+ 50. Kh3 g5 51. hxg5+ Kxg5 52. Rc5 Kf4 53. Nf1 Nxc4 54. Rxc4 Ke5 55. Nd2 Kd5 56. Rc8 Kd6 57. Rh8 Rg6 58. Nf3 Rg4 59. Rxh5 d3 60. Rxf5 Rb4 61. Nd2 Kc6 62. g4 Kd6 63. g5 Ke6 64. Rf3 Rd4 65. g6 Ke7 66. g7 Rd8 67. b4 Rg8 68. Rg3 Kf6 69. b5 Ke5 70. b6 Kd6 71. Rg6+ Kd7 72. Nc4 d2 73. Nxd2 Kd8 74. Ne4 Ke7 75. Kg4 Ke8 76. Nf6+ Kf7 77. Kf5 Rxg7 78. Rxg7+ Kxg7 79. b7 Kf7 80. b8Q Ke7 81. Ke5 Kf7 82. Qg8+ Ke7 83. Qe8# 1-0 b.) The second game shows Tiger with superior ability to live without opening book ( quite ugly setup by Crafty ) and getting the advantage . Until [D]r1b1rbk1/1pp2pp1/2n1q2p/1B1pPp2/2PP4/5N2/PBQ2PPP/R3R1K1 w - - 0 1 Here Tiger played 18. c5 ? This looks like a severe positional mistake , weakening own black-coloured bishop and even worse giving up the tension in the centre and so the chances for advantage vanish ( Game evened out to draw soon ) . Tiger seems to have problems understanding the pawn structure here ( I have observed similar choices by it before , one posted last week if memory serves me well ) . This position seems to be Tiger-specific , other programs have no problem here it seems . The complete game : Tournament: 40 in 40 Date: 13/8/2000 White: Chess Tiger 12.0e Black: Crafty 17.12 Opening: Nimzowitch 1. e4 Nc6 2. d4 d5 3. e5 e6 4. c3 Nge7 5. Bd3 Nf5 6. Nf3 Be7 7. 0-0 0-0 8. Qc2 h6 9. Nbd2 a5 10. Re1 a4 11. Nf1 Qd7 12. Ne3 Re8 13. Nxf5 exf5 14. Bb5 a3 15. bxa3 Bxa3 16. c4 Bf8 17. Bb2 Qe6 18. c5 Bd7 19. a4 g6 20. Bc3 Bg7 21. Qb3 Ra7 22. Nd2 b6 23. cxb6 cxb6 24. Rab1 Rc8 25. Rbc1 Rac7 26. Qb2 Na7 27. Ba6 Rb8 28. Bb4 Rxc1 29. Rxc1 b5 30. Bd6 Rb6 31. axb5 Nxb5 32. Bxb5 Rxb5 33. Qa3 Qe8 34. Rc7 Rb6 35. Ra7 Rc6 36. h3 Rc2 37. Nf1 Be6 38. Ne3 Rc8 39. Ra5 Qc6 40. Bc5 Qb7 41. Kh2 Qb1 42. Qb4 Qe4 43. Ra3 Qh4 44. Kg1 Kh7 45. Nf1 Qe4 46. Ra7 f4 47. f3 Qc2 48. Ra5 Qc4 49. Nd2 Qxb4 50. Bxb4 f6 51. Bd6 fxe5 52. dxe5 Re8 53. Ra1 Bf5 54. Ra5 Bxe5 55. Rxd5 Bxd6 56. Rxd6 g5 57. Kf2 Re3 58. Nc4 Rc3 59. Ne5 Rc2+ 60. Kg1 Re2 61. Nc6 Re6 62. Rd7+ Kg6 63. Ne7+ Kf6 64. Nxf5 Kxf5 65. Kh2 Re5 66. h4 gxh4 67. Kh3 Kg5 68. Rg7+ Kh5 69. Rg4 Re1 70. Rxh4+ Kg5 71. Rg4+ Kf5 72. Kh2 h5 73. Rg8 Kf6 74. Rf8+ Kg5 75. Rd8 Re2 76. Rg8+ Kh4 77. Rf8 Kg5 78. Rh8 Rb2 79. Re8 Ra2 80. Kh3 1/2-1/2 ( adjudicated ) Before someone misunderstands me ( as I post Tiger mistakes for the 2nd time now ) : the only reason for this is that I look at it playing a lot at the moment and it sure is an extremely strong and entertaining program . Have fun . pete
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