Author: blass uri
Date: 10:08:55 04/14/99
Go up one level in this thread
On April 14, 1999 at 11:48:32, Hristo wrote: >On April 14, 1999 at 02:47:50, Paulo Soares wrote: > >>On April 13, 1999 at 16:36:05, Hristo wrote: >> >>> >>>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 >> >>Hristo, >> >> Fritz5.32, Hiarcs7.01 and Genius6 don't see the >>mate in a PII-300, after 26. ...Qe7, in less of 4min 30". >> After 26. ...Qe7 27. Qg4 f6: >> Fritz5.32..... 5" >> Hiarcs7.01....20" >> Genius6.......71" >> >>Regards, >> >>Paulo Soares, from Brazil > >Thanks Paulo! >It is interesting to see that. Since 26. ...f6 is forced by Qg4 so this position >shouldn't create too many branches, and the mate after that is relatively simple >(Bg6 and then just check, check, check ... mate). my engines prefer 26...fxe6 or 26...Bh2+ with evaluation of longer mate against black and do not see that 26...f6 is forced I do not think that 26...f6 is the slowest way to lose Uri
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