Author: Heiner Marxen
Date: 07:34:39 11/27/02
Go up one level in this thread
On November 26, 2002 at 16:58:34, John Merlino wrote: >On November 26, 2002 at 15:00:20, Art Basham wrote: > >>[D]rnb2rk1/ppqp1p1p/2p3pQ/8/8/3NN3/PPB2PPP/3RR1K1 w - - >> >>Here Fritz7 announced mate in 11, but it turns out to be only mate in about 7... >> >>White plays >>1. Nf5...! > >It is a mate in 8, which Chessmaster 9000, on a P3-733, announces in three >seconds: > >Time Depth Score Positions Moves >0:00 1/3 4.14 2498 1.Ng4 Qd6 2.Nc5 >0:00 1/4 3.38 9942 1.Ng4 Qd8 2.Nc5 d6 >0:00 1/5 9.50 41202 1.Ng4 Qd8 2.Nf4 f6 3.Rxd7 Qxd7 > 4.Bb3+ Qd5 5.Nxd5 >0:00 1/6 9.72 65268 1.Ng4 Qd8 2.Nf4 f5 3.Rxd7 Qxd7 > 4.Bb3+ Qe6 5.Nxe6 Rf7 >0:02 1/7 14.47 239303 1.Ng4 Qd6 2.Nc5 Qf4 3.Qxf4 d5 4.Nh6+ > Kg7 5.Re7 >0:03 1/7 Mate08 380009 1.Nf5 gxf5 2.Ne5 d5 3.Rd3 Qd6 4.Rg3+ > Qg6 5.Nxg6 fxg6 6.Re7 Rf7 7.Re8+ > Rf8 8.Rxf8# >0:05 1/8 Mate08 625769 1.Nf5 gxf5 2.Ne5 d5 3.Rd3 Qd6 4.Rg3+ > Qg6 5.Nxg6 fxg6 6.Re7 Rf7 7.Re8+ > Rf8 8.Qxf8# > >Also, and very important, Ng4 is also a mate in 8, so this is not a very good >test position if you are looking for a single move. Here is what CM9000 says >when you ask it to give you the two best moves: > >Time Depth Score Positions Moves >0:10 1/9 Mate08 1306153 1.Nf5 gxf5 2.Ne5 d5 3.Rd3 Qd6 4.Rg3+ > Qg6 5.Nxg6 fxg6 6.Re7 Rf7 7.Re8+ > Rf8 8.Qxf8# >0:13 1/9 Mate08 1616681 1.Ng4 Qd6 2.Nf4 Qxf4 3.Qxf4 d5 > 4.Nf6+ Kg7 5.Nh5+ gxh5 6.Qg5+ Kh8 > 7.Qh6 Kg8 8.Qxh7# > > >jm Chest confirms this (5.1 hours, Athlon 1500+, 128 MB): PV: Nf5 gxf5 Ne5 f6 Nxd7 Qxh2+ Kxh2 Nxd7 Bb3+ Kh8 Re7 Rf7 Rxf7 f4 Rxh7# PV: Ng4 Qd6 Nb4 Qe6 Rxe6 fxe6 Bxg6 hxg6 Qxg6+ Kh8 Rd3 Rf7 Rh3+ Rh7 Rxh7# As always, CM is mega-fast! Cheers, Heiner
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