Author: Art Basham
Date: 12:19:47 12/26/02
Go up one level in this thread
Thanks for the neat analysis, but what about move one? Does CM9000 show Bxh7+ at all...? Just wondering..thanks Art ==============================On December 26, 2002 at 15:03:30, John Merlino wrote: >On December 26, 2002 at 10:17:23, Art Basham wrote: > >>In this position, white sacrifices both bishops AND a knight >>to go for mate.... (possible 10 or 11 moves...:-) >> >>[D]r2q1rk1/pb2bppp/1p2p3/nP1n4/8/P2BN1N1/1BP3PP/R2Q1R1K w - - >> >>Any programs find 1. Bxh7+....? > >If Black accepts all of the sacrifices, then the whole sequence is a Mate in 12 >(at most), according to CM9000. Not accepting the last sacrifice (4.Nef5+ Kg8) >leads to a mate in 14 (at most). > >However, with the second sacrifice, 3.Bxg7, Black has the better options of >3...f5 or 3...f6. By playing around, it appears that if Black chooses 3...f5, >best play leads to mate in about 20 moves. > >3...f6 is more complicated, with the following line being probable: > >3...f6 4.Bh6 Rf7 5.Qg6+ Kh8 6.Qxf7 Qg8 > >leading to this position: > >[D]r5qk/pb2bQ2/1p2pp1B/nP1n4/8/P3N1N1/2P3PP/R4R1K w - - 0 7 > >CM9000, on a P3-733, says this about this position: > >Time Depth Score Positions Moves >0:00 1/3 3.03 1700 7.Qxg8+ Rxg8 8.Nxd5 Bxd5 9.Rad1 >0:00 1/4 2.88 3940 7.Qxg8+ Rxg8 8.Rfd1 Bc5 9.Nxd5 Bxd5 >0:00 1/5 2.96 13072 7.Qxg8+ Rxg8 8.Rae1 Rc8 9.Nxd5 Bxd5 >0:00 1/6 2.73 39049 7.Qxg8+ Rxg8 8.Rad1 Nxe3 9.Bxe3 > Nc4 10.Bd4 e5 >0:01 1/7 2.80 106735 7.Qxg8+ Rxg8 8.Nxd5 Bxd5 9.Rf4 > f5 10.Ra4 Bd6 >0:02 1/8 2.78 207704 7.Qxg8+ Rxg8 8.Nxd5 Bxd5 9.Rf4 > f5 10.Ra4 Bd6 11.Bf4 >0:09 1/9 2.56 800845 7.Qxg8+ Rxg8 8.Nxd5 Bxd5 9.a4 Rg6 > 10.Bf4 e5 11.Bd2 Nc4 12.Rad1 >0:35 1/10 2.71 2870648 7.Qxg8+ Kxg8 8.Rfd1 Bd6 9.Nxd5 > Bxd5 10.Nf5 Be5 11.Rac1 Re8 12.c3 > Bxg2+ 13.Kxg2 exf5 >0:52 1/10 2.84 4182074 7.Qh5 Qh7 8.Ng4 Nc4 9.Rae1 Nxa3 > 10.Rxe6 Nxb5 11.Nf5 Rg8 12.Nxe7 > Nxe7 13.Rfxf6 >1:27 2/11 2.99 7162342 7.Qh5 Qh7 8.Ng4 Nc4 9.Rae1 e5 10.Nf5 > Bf8 11.Qh4 Bxh6 12.Qxh6 Qxh6 13.Nfxh6 >4:10 3/12 3.18 20904898 7.Qh5 Qh7 8.Ng4 Nc4 9.Rae1 Nxa3 > 10.Ne5 Bb4 11.Bg7+ Kxg7 12.Qf7+ > Kh8 13.Ng6+ Qxg6 14.Qxg6 Bxe1 15.Qh5+ > Kg7 16.Rxe1 Nxb5 17.Rxe6 > >So, with best play by Black, mate is probably not coming any time soon.... > >jm
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