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Subject: One mate to solve :-) (was Re: How long does it take)

Author: Angrim

Date: 16:27:04 10/24/01

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On October 23, 2001 at 13:12:38, Andrew Williams wrote:

>Hi,
>
>My program lost this game against a crafty clone on ICC recently:
>
>[Event "ICS rated blitz match"]
>[Site "204.178.125.65"]
>[Date "2001.10.21"]
>[Round "-"]
>[White "MoonShot"]
>[Black "PostModernist"]
>[Result "1-0"]
>[WhiteElo "2859"]
>[BlackElo "2772"]
>[TimeControl "600+2"]
>
>1. d4 Nf6 2. c4 c6 3. Nc3 e6 4. e4 Bb4 5. Bd3 d5 6. e5 dxc4 7. Bxc4 Nd5 8.
>Ne2 b6 9. O-O O-O 10. Qd3 Be7 11. Bd2 Bb7 12. Qg3 Kh8 13. Ne4 Ba6 14. Rac1
>Bxc4 15. Rxc4 Qd7 16. Bg5 Na6 17. Bxe7 Nxe7 18. Nd6 Nc7 19. Rfc1 Rad8 20.
>Qf3 Ne8 21. Ne4 Kg8 22. Qh3 a5 23. a4 Nc7 24. Qg4 Kh8 25. Qh5 Kg8 26. R1c3
>Qd5 27. Nf6+ gxf6 28. Rg3+ Kh8 29. Qh6 Ng6 30. Rh3
>{PostModernist resigns} 1-0
>
>
>The move 27.Nf6+ wins everything immediately. MoonShot (crafty 18.12
>on  a K7 1.33GHz) found that in 14 seconds (albeit with hash-tables
>already full). With some fiddling about with null move rules, PM can
>find it in 37 seconds from a "standing start" (K7 1.2GHz). I'd be
>interested to know how other programs do on this.
>
>[D]3r1rk1/2n1nppp/1pp1p3/p2qP2Q/P1RPN3/2R5/1P2NPPP/6K1 w - - bm Nf6
>
>
>Regards
>
>Andrew

Interesting position to feed to the mate solver programs, since it
comes from a real game, and is a rather deep win.  Here are the
results from PN^2 search on Athlon 1.2ghz.

proved that move e4f6 wins, 17 turns
PN2:215756548 evals, 11265632 expands, 407.84 seconds

Angrim



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