Author: John Merlino
Date: 12:03:30 12/26/02
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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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