Author: F. Huber
Date: 10:09:01 05/15/04
Go up one level in this thread
On May 15, 2004 at 12:35:31, F. Huber wrote: >On May 15, 2004 at 11:34:04, Heiner Marxen wrote: >> >>According to Chest this actually is a mate in 9: >> >>PV: Qc7 Bf6 Rxe7+ Bxe7 Re3 Qf1+ Kxf1 Re6 Qc8+ Bd8 Rxe6+ fxe6 Qd7+ Kf8 Nxe6+ Kg8 >>Qg7# >> >>I didn't ask for a solution tree, but the "refutation table" shows: >>refu 43: Qc7 Bf6 [ 7-] >>solu 1: Bxd4+ [ 6+] >>solu 2: Qf1+ [ 6+] >>solu 3: Bh6 [ 1+] >>solu 4: Re6 [ 1+] >>solu 5: Rg6 [ 1+] >>solu 6: Qc4 [ 1+] >>solu 7: Qxc5 [ 1+] >>solu 8: h4 [ 1+] >>solu 9: Rg8 [ 1+] >>solu 10: Rf8 [ 1+] >>solu 11: Rh7 [ 1+] >>solu 12: Rhh6 [ 1+] >>solu 13: Rf6 [ 1+] >>solu 14: Rdh6 [ 1+] >>solu 15: f6 [ 1+] >>solu 16: e6 [ 6+] >>solu 17: e5 [ 6+] >>solu 18: b6 [ 1+] >>solu 19: Bf6 [ 8+] >>solu 20: Bf8 [ 4+] >>solu 21: Kf8 [ 2+] >>solu 22: Be5 [ 6+] >>solu 23: Rd7 [ 2+] >>solu 24: Rd8 [ 1+] >>solu 25: Qb6 [ 1+] >>solu 26: Qe2 [ 6+] >>solu 27: Qd3 [ 1+] >>solu 28: Qa6 [ 1+] >>solu 29: Qa5 [ 1+] >>solu 30: Qxb4 [ 1+] >>solu 31: Qa4 [ 1+] >>So, Bf6 appears to be the best answer, all other moves result in shorter mates. >> >>Since it starts with a quiet move, it is hard to find, of course. >>[Chest needed 1 hour with 100MB hash on an Athlon 1500+] >> >>Cheers, >>Heiner > >Hello Heiner, > >what I´m missing in your refutation list is the black castling!? >(after 1.Qc7 black has actually 32 moves) > >Maybe you forgot the castling right when copying the FEN string (?), >this was the FEN in the original posting: > >4k2r/1p2ppb1/2pr4/QqNp1P1p/1P1P4/2P2R2/P5PP/4R1K1 w k - 0 1 > >Eventually exactly this 1... 0-0 would be the only defence against 1.Qc7 - >Chest is just calculating on this position on my faster desktop, and I´m >really curious about the result ... > >Best regards, >Franz. Yes, exactly this black castling was the _key_ move - here is Chest´s result: ChestUCI Ver.3.5 UCI1: CPU: Pentium-4 2.66GHz FEN: 4k2r/1p2ppb1/2pr4/QqNp1P1p/1P1P4/2P2R2/P5PP/4R1K1 w k - Suche nach Matt in 9 ... (Hash=384MB) Suche abgeschlossen ... (Zeit=2029.28s) Kein Matt in 9 gefunden ! (33:49) Best regards, Franz.
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