Author: John Merlino
Date: 22:13:53 01/22/03
Go up one level in this thread
On January 22, 2003 at 15:54:11, Jon Dart wrote:
>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
As somebody else posted, I don't think there are any better alternatives.
Chessmaster 9000, on a P3-733, thinks that White is winning from the outset, and
the score drops with almost every depth. But it doesn't take very long to think
about any of the other moves, so it appears that Qxh2, for example, is really
the only move....
Before 22...Qxh2:
Time Depth Score Positions Moves
0:00 1/3 0.36 3940 1...Qxh2+ 2.Kf1 Bxc3 3.Rxc3 Qh1+
4.Ke2
0:00 1/4 0.33 18874 1...Qxh2+ 2.Kf1 Bxc3 3.Rxc3 bxa6
4.Qb7
0:01 1/5 0.31 59656 1...Qxh2+ 2.Kf1 Bxc3 3.Rxc3 bxa6
4.g3 Re8
0:02 1/6 0.41 206190 1...Qxh2+ 2.Kf1 Bxc3 3.Rxc3 bxa6
4.Qe7 Re8 5.Rd8 Qh1+ 6.Ke2
0:11 1/7 0.51 889529 1...Qxh2+ 2.Kf1 Bxc3 3.Qb6 Bd4
4.Qxd4 bxa6 5.Qd8+ Ne8 6.Qe7
0:31 1/8 0.60 2573966 1...Qxh2+ 2.Kf1 Bxc3 3.Qb6 Bd4
4.Qxd4 bxa6 5.Qb6 Qf4 6.Rd8+ Ne8
1:14 1/9 0.56 6371739 1...Qxh2+ 2.Kf1 Bxc3 3.Rxc3 bxa6
4.g3 Re8 5.Qb6 Qh3+ 6.Bg2 Qh5 7.Rd8
h6
4:28 1/10 0.81 23753826 1...Qxh2+ 2.Kf1 Bxc3 3.Qb6 Ba5
4.Qxa5 bxa6 5.Rd8+ Ne8 6.Rxb8 Qxb8
7.Qxa6 Qd6 8.Qc6
Before 23...Bxc3:
Time Depth Score Positions Moves
0:00 1/3 0.36 2015 2...Bxc3 3.Rxc3 Qh1+ 4.Ke2
0:00 1/4 0.33 9424 2...Bxc3 3.Rxc3 bxa6 4.Qb7
0:00 1/5 0.31 43209 2...Bxc3 3.Rxc3 bxa6 4.g3 Re8
0:01 1/6 0.41 81893 2...Bxc3 3.Rxc3 bxa6 4.Qe7 Re8
5.Rd8 Qh1+ 6.Ke2
0:04 1/7 0.51 318796 2...Bxc3 3.Qb6 Bd4 4.Qxd4 bxa6
5.Qd8+ Ne8 6.Qe7
0:12 1/8 0.66 956418 2...Bxc3 3.Qe7 Bb4 4.Qxb4 bxa6
5.Qe7 h6 6.Rd8+ Rxd8 7.Qxd8+ Kh7
0:24 1/9 0.56 2067321 2...Bxc3 3.Qe7 Bb4 4.Qxb4 bxa6
5.g3 Re8 6.Qa5 Qh3+ 7.Bg2
1:14 1/10 0.81 6549469 2...Bxc3 3.Qb6 Ba5 4.Qxa5 bxa6
5.Rd8+ Ne8 6.Rxb8 Qxb8 7.Qxa6 Qd6
8.Qc6
3:13 2/11 1.03 17356239 2...Bxc3 3.Qb6 Ba5 4.Qxa5 bxa6
5.Rd8+ Ne8 6.Rcd1 h5 7.Rxb8 Qxb8
8.Qxa6 Qc7 9.Qb5
jm
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