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Subject: A Great Game

Author: Anthony Cozzie

Date: 21:33:31 12/05/04


Every so often when Zappa and Crafty play, they come up with some really
brilliant moves and tough positions.  Somehow, when I watched this game I had an
intense image of two boxers who just refused to give up, no matter how bloodied
they were.  You can judge for yourself.  The opening was a French defense, with
Zappa defending.  Zappa had a few tense moments, but it was able to get a very
solid position, despite the horrible French bishop.  Zappa thought it was about
equal, while Crafty liked white to the tune of about +0.6.  I guess the true
value is somewhere in between; Black should draw but I think White has all the
winning chances here.

[D]2r1r1k1/3bq2p/p5pQ/Pp1pPp2/3P4/3B1R2/2P3PP/5RK1 b - - 0 24

So they shuffled, as computers are wont to do, and Crafty was finally so happy
with its position that it gave away the a5 pawn in order to prevent the draw.
At this point Crafty was about +0.4, while Zappa thought it was winning by 0.7
or so.  The shuffling continued, with Zappa trying to advance its passed a pawn
without letting Crafty checkmate it on the kingside.

[D]2r4k/7p/p3b1p1/qp1pPp2/3P1R2/2rB2R1/2P3PP/4Q1K1 w - - 0 38

Here came the first problem.  Zappa had counted on Kg8, but white has a draw in
that line.

[D]2r5/6kp/4b1p1/1p1pPp2/pq1P3Q/2rB2R1/2P3PP/5RK1 b - - 0 45; bm Qf8; test
position 1

1... Kg7-g8 2. Rg3-h3 Rc3-c7 3. c2-c3 Qb4xc3 4. Bd3xb5 Qc3-b4 5. Bb5-a6 Rc8-b8
6. Rf1-e1 a4-a3
 = (1.13)	Depth: 11/33	00:00:08.83	4885kN (553 KN/s, 0 splits, 0 aborts)
1... Kg7-g8 2. Qh4-f6 Rc3-c6 3. Rg3xg6 h7xg6 4. Qf6xg6 Kg8-h8 5. Qg6-h6 Kh8-g8
6. Qh6-g6
 = (0.00)	Depth: 12/33	00:00:12.63	7287kN (577 KN/s, 0 splits, 0 aborts)
1... Qb4-f8 2. Rg3-h3 h7-h5 3. Rh3-g3 Kg7-h7 4. Bd3xb5 Rc3xg3 5. Qh4xg3 Qf8-b4
6. Qg3-d3 a4-a3 7. Rf1-f3
 = (0.56)	Depth: 12/34	00:00:28.62	17188kN (600 KN/s, 0 splits, 0 aborts)

This let Crafty win the b5 pawn, and the shuffling continued.  Zappa was able to
get its a pawn to a2, but it remained hampered by its horrible bishop.  Finally,
just when Crafty thought it had equalized, Zappa struck:

[D]8/r5k1/4b1p1/1q1pPp1p/3P4/2P3P1/p4K1P/R1QB4 b - - 0 68; bm f4! test position
2

1... f5-f4 2. g3xf4 Be6-f5 3. Bd1-c2 Bf5-g4 4. Kf2-g1 Qb5-e2 5. Bc2-b3 Bg4-e6 6.
f4-f5 g6xf5 7. Qc1-g5 Kg7-h7
 = (1.14)	Depth: 13/36	00:00:38.98	29001kN (744 KN/s, 0 splits, 0 aborts)

After some complicated tactics, Zappa emerged with a Rook versus Crafty's 3
passed pawns. When I was just about to celebrate a pretty win, Zappa threw the
game away with Rf4??.  This is a really hard position for Zappa, because after
Rf4 d5 it has a Rook and Bishop vs 2 connected passers, whereas after Bf5 it has
a Rook vs 3 connected passers :)  Crafty gets it at 8 ply or so though.

[D]8/7k/4Prp1/7p/2BP4/2P5/7P/1b4K1 b - - 0 82; bm Bf5!; test position 3

After Rf4 Crafty was able to force the draw, although Zappa didn't realize it
for another 10 moves. The final position:

[D]8/3P3k/4P3/6pp/5r2/2P3K1/7P/1b6 b - - 0 87

[Event "Computer chess game"]
[Site "vanderboom"]
[Date "2004.12.06"]
[Round "1"]
[White "Crafty-19.14"]
[Black "Zappa"]
[Result "1/2-1/2"]
[TimeControl "40/1200"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Ne7 7. Nf3 Nbc6
8. a4 Bd7 9. Be2 O-O 10. O-O Rc8 11. Ba3 cxd4 12. cxd4 Re8 13. Nh4 Na5 14.
Bd3 Nc4 15. Qh5 g6 16. Qh6 Nf5 17. Nxf5 exf5 18. a5 Nxa3 19. Rxa3 f6 20. f4
b5 21. Rf3 fxe5 22. fxe5 Qe7 23. Ra1 a6 24. Raf1 Be6 25. Qd2 Rc7 26. Rg3
Rec8 27. Rgf3 Rc6 28. Rg3 R6c7 29. Rgf3 Kh8 30. Rh3 Kg8 31. Rf4 Qg5 32. Rg3
Qh6 33. Qf2 Rc3 34. Qf1 Kh8 35. Rgf3 Qf8 36. Rg3 Qa3 37. Qe1 Qxa5 38. Rf1
Qb6 39. Qe3 Kg7 40. Rf4 Qd8 41. Qe2 Qa5 42. Rf1 Qb4 43. Qf2 a5 44. Qf4 a4
45. Qh4 Qf8 46. Rh3 h5 47. Rg3 Kh7 48. Rg5 Qh6 49. Bxb5 a3 50. Bd3 Ra8 51.
Rg3 Rc6 52. Ra1 a2 53. Qe7+ Qg7 54. Qb4 Rc7 55. Qd2 Rca7 56. Bb5 Qc7 57.
Be2 Rb7 58. Rb3 Rb6 59. Bd1 Qb7 60. Kh1 Ra7 61. Kg1 Rb5 62. Qc3 Qb6 63. g3
Kg8 64. Qd2 Kg7 65. Kf2 Ra8 66. Rxb5 Qxb5 67. Qc1 Ra7 68. c3 f4 69. gxf4
Bf5 70. Bc2 Bg4 71. Kg1 Qe2 72. f5 Kg8 73. Bb3 Bxf5 74. Bxd5+ Kh7 75. Bg2
Qb5 76. Bf3 Qb1 77. Qf1 Bd3 78. Be2 Rf7 79. Qxb1 axb1=Q+ 80. Rxb1 Bxb1 81.
e6 Rf6 82. Bc4 Rf4 83. d5 Rxc4 84. d6 Rg4+ 85. Kf2 Rf4+ 86. Kg3 g5 87. d7
1/2-1/2 {Drawn by Arbiter}

anthony



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