Author: Uri Blass
Date: 07:02:58 10/16/03
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On October 16, 2003 at 09:18:27, Tord Romstad wrote: >On October 16, 2003 at 09:08:15, Lyn Harper wrote: > >> Why should it be moderately difficult? > >Simply because the combination is not really that deep. > >>Well, Chessmaster9000 could'nt solve it, just kept wanting to take the knight on >>e5 after glancing at the correct >>move for a nanosecond. Same with Ruffian. Good thing I did'nt offer $1 million >>to the first solver. :) >> And you come up with some obscure chess program, that I've never heard of, >> and get the solution. > >It's not so obscure to me, as it happens to be my own program. :-) > >I would guess that most strong programs finds the right move rather quickly, >but that CM9K and Ruffian have one of their few blind spots in this particular >position. > >Tord Your guess is wrong. most programs are different than your program and your program has some advantages relative to the top programs so the top programs cannot see the following line in a reasonable time: 1. Nf6+ Kg7 2. Nh5+ Kg6 3. Bc2+ Kxh5 4. d8=Q Nf7+ 5. Ke6 Nxd8+ 6. Kf5 e2 7. Be4 e1=N 8. Bd5 c2 9. Bc4 c1=N 10. Bb5 Nc6 11. Bxc6 Nc7 12. Ba4 Nc2 13. Bxc2 Ne2 14. Bd1 c4 15. Bxe2# * They probably assume that black is winning because black has a big material advantage. I guess that your program extend moves that threat mate in 2 like 10.Bb5 when other programs do not do it(even if they extend mate threat they may not do it in positions when the side to move has only a bishop and pawn because they were not designed to solve studies and in games it may be better not to waste time on checking it). Uri
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