Author: Jon Dart
Date: 12:54:11 01/22/03
Here is a recent test game against Tao 5.4:
[Event "Computer chess game"]
[Site "SHIVA-DT"]
[Date "2003.01.15"]
[Round "11"]
[White "yin54"]
[Black "Arasan version 6.3"]
[Result "1-0"]
[TimeControl "40/2400"]
1. e4 c5 2. c3 d5 3. exd5 Qxd5 4. d4 Nf6 5. Nf3 Bg4 6. Be2 e6 7. Na3 Be7 8.
Nb5 Na6 9. c4 Qe4 10. Nc3 Qf5 11. Qa4+ Kf8 12. Be3 Bxf3 13. Bxf3 cxd4 14.
Bxd4 Nc5 15. Bxc5 Bxc5 16. O-O Rb8 17. b4 Bd4 18. Rac1 a6 19. b5 Be5 20.
Rfd1 Qf4 21. Qb4+ Kg8 22. bxa6 Qxh2+ 23. Kf1 Bxc3 24. Qb6 Ba5 25. Qxa5 bxa6
26. Rd8+ Ne8 27. g3 Rxd8 28. Qxd8 g6 29. Qxe8+ Kg7 30. Qa4 Qh3+ 31. Kg1 Qf5
32. Qa3 h5 33. c5 h4 34. gxh4 Rxh4 35. c6 Qg5+ 36. Kf1 Qb5+ 37. Be2 Qg5 38.
Qb2+ Kh7 39. Bf3 Rb4 40. Qc3 Rf4
{Black resigns} 1-0
Arasan played 22 .. Qxh2+ and 23 .. Bxc3, both with a score of about -0.25 for
Black. At move 25, it failed low and could see it was lost. IMO Black shouldn't
take the pawn at move 22, and also shouldn't follow up with 23 .. Bxc3, although
it seems Black doesn't have any good alternatives. In these positions, it
doesn't seem at all easy for programs to see disaster coming.
This is the move 22 position:
[D] 1r4kr/1p3ppp/P3pn2/4b3/1QP2q2/2N2B2/P4PPP/2RR2K1 b - -
and this is the move 23 one:
[D] 1r4kr/1p3ppp/P3pn2/4b3/1QP5/2N2B2/P4PPq/2RR1K2 b - -
Crafty was still selecting Qxh2+ after 50 minutes, although it was failing low
at the point (depth 14). The score was about +1.1 for White at that point.
Crafty also doesn't ever seem to switch off Bxc3, although it got a -2.38 score
for Black on ply 14 after 25 minutes. (Arasan also likes Bxc3 for a very long
time).
How long does your favorite engine take to be really unhappy playing these
moves?
--Jon
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Last modified: Thu, 15 Apr 21 08:11:13 -0700
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