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Subject: When does a program search for mate?!

Author: Hristo

Date: 13:36:05 04/13/99



I played a game against crafty15_20 two nights ago.
Used craftys default settings, with no oppening book or
endgame databases. Without any board representation other
than "d" option on the command line. The computer is P II 450
with 128 MRam. 180K N/sec

Why didn't crafty see the mate after 26. ... Qe7 (under normal
conditions, i.e. 2-3min per move)?! How many other
programs don't see that mate? BTW after 26. ... Qe7 17. Qg4 f6
crafty finds the mate in about 18 sec.
In analize mode it takes something like 30 min or more for crafty to
find that Qe7 leads to mate.

At what point a program searches for mate instead of material gains?
(I have the crafty code but haven't spend the time to learn it.)

[Event "?"]
[Site "?"]
[Date "1999.04.12"]
[Round "?"]
[White "Hristo Doichev"]
[WhiteElo ""]
[Black "Crafty 15.20"]
[BlackElo ""]
[Result "1-0"]

1. e3 e6 2. d4 Nc6 3. c4 Nf6 4. Nf3 Be7 5. Be2 O-O 6. O-O d5
7. b3 Bd7 8. Bb2 dxc4 9. bxc4 Ng4 10. h3 Nf6 11. Nc3 Qc8 12. e4
Na5 13. e5 Ne8 14. Qc2 Nc6 15. a3 Na5 16. Bd3 Kh8 17. Rab1 Qd8
18. d5 exd5 19. cxd5 a6 20. Rfe1 Bc8 21. Rbd1 b6 22. e6 Nd6
23. Bxh7 Ndc4 24. Ba1 Nxa3 25. Qe4 Bd6 26. Nb1 Qe7 27. Qg4 f6
28. Bg6 Bf4 29. Qxf4 Qb4 30. Qxb4 Re8 31. Qh4+ Kg8 32. Qh7+
Kf8 1-0



hristo



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