Author: Joachim Rang
Date: 03:31:04 04/01/04
Go up one level in this thread
On April 01, 2004 at 05:13:53, Vasik Rajlich wrote:
>On March 31, 2004 at 06:31:28, Tord Romstad wrote:
>
>>I just completed a 100-game blitz match between Gothmog 0.4.7 and Crafty 19.9
>>(yes, I know it is not the most recent version). In one of the games, the
>>following position arised:
>>
>>[D]r2qr3/4bpkp/p2p2pN/1p1P4/2pNP3/1b5P/1P1Q1PP1/R3R1K1 w - -
>>
>>Here, Gothmog surprised me (and Crafty) by playing the knight sac Nxf7!?. It
>>plays this after only 7 plies and 1 second, almost certainly as a speculative
>>sac, but still keeps it with a +1 score after 20 minutes and 16 plies. In
>>the game, Gothmog quickly got a winning attack after 24. Nxf7 Kxf7 25. Ne6 Qc8
>>26. Qh6 Bf8 27. Qxh7+ Kf6 28. Re3.
>>
>>Which other engines like Nxf7? Is the sac correct?
>>
>>Another cool game from the match was the following, which is probably
>>not good, but amused me because of its "19th century look". It was played
>>in Gothmog's new favorite opening, the King's gambit:
>>
>>[Event "Computer chess game"]
>>[Site "aload.uio.no"]
>>[Date "2004.03.31"]
>>[Round "63"]
>>[White "Gothmog 0.4.7"]
>>[Black "Crafty-19.9"]
>>[Result "1-0"]
>>[TimeControl "300+1"]
>>
>>1. e4 e5 2. f4 exf4 3. Bc4 Nf6 4. Nc3 c6 5. d4 Bb4 6. e5 Ne4 7. Kf1 Nxc3 8.
>>bxc3 Bxc3 9. Ba3 b5 10. Bd6 bxc4 11. Qg4 g5 12. Nh3 Bxa1 13. Nxf4 h6 14.
>>Nh5 Qb6 15. Qf5 Ba6 16. g4 Qxd4 17. Qf6 Qd1+ 18. Kg2 Qxc2+ 19. Kh3 Qd3+ 20.
>>Ng3 Qxd6 21. Qxd6 Bb2 22. Qf6 d5 23. Qxh8+ Kd7 24. Qf8 Kc7 25. Qd6+ Kb6 26.
>>Qb4+ Bb5 27. Qxb2 Nd7 28. Rb1 Kc7 29. Qb4 Nxe5 30. Nf5 Ng6 31. Qd6+ Kb7 32.
>>Nd4 Nf4+ 33. Kg3 Ne2+ 34. Nxe2 Rc8 35. a4 a6 36. axb5 cxb5 37. Qxd5+ Kb6
>>38. Nc3 h5 39. Nxb5 Rc5 40. Qd8+
>>{Black resigns} 1-0
>>
>>Position after white's 17th move:
>>
>>[D]rn2k2r/p2p1p2/b1pB1Q1p/4P1pN/2pq2P1/8/P1P4P/b4K1R b kq -
>>
>>Tord
>
>Tord,
>
>you have your king safety weights set very high. It's consistent (IMO) with your
>search, and it's definitely entertaining. It will win you some games, and lose
>you some games.
>
>You might consider (if you haven't already) trying different weightings for
>overall king safety, to see the effect on performance. However, as I'm sure you
>know, it's really hard to play enough games to use this method to tune the eval.
>
>You might also find it interesting to get access to Shredder. It has quite a
>similar style to Gothmog, but more accurate. See how SMK deals with these
>positions ...
>
>Cheers,
>Vas
Shredder 8 chooses Nxf7 after 2 seconds first with a draw score, but the score
is rising up to +2 after some time. So the sac is correct, black is horribly
passive after the sac and will eventually loose material.
regards Joachim
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