Author: Heiner Marxen
Date: 15:47:58 05/27/01
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On May 26, 2001 at 15:46:20, Uri Blass wrote: >[D]2kr3r/ppp2p2/7p/8/6bq/2Q5/PPP3K1/RNB1N3 b - - 0 1 > >This position is from a practical game of Deep Fritz in the ICC tournament(round >1). > >The opponent resigned but Deep Fritz can probably force mate in 9 moves by >21...Rhg8 22.Bf4 Bh3+ 23.Kf3 Qg4+ 24.Ke3 Qg1+ 25.Kf3 Bg4+ 26.Ke4 f5+ 27.Ke5 Qb6 >28.Qxc7+ >Kxc7 Nf3 Rge8# > >At least this is the opinion of yace. > >Uri Yes, according to Chest that is completely correct. It is a mate in 9 (i.e. there is no shorter forced mate), and the above PV is part of Chest's solution tree, i.e. is a valid PV. Chest finds a total of three key moves, which force the mate in 9: Rde8 Qxh8 Rxh8 Nc3 Rg8 Bg5 Qxg5 Ne4 Qd5 Kf1 Qxe4 Kf2 Qe2+ Kg1 Bf3+ Ng2 Qxg2# Rhe8 Be3 Bh3+ Kf3 Rd1 Ke2 Bg4+ Nf3 Qh2+ Kxd1 Bxf3+ Kc1 Qh1+ Bg1 Qxg1+ Kd2 Qd1# Rhg8 Bf4 Bh3+ Kf3 Qg4+ Ke3 Qg1+ Ke2 Bf1+ Kf3 Qg4+ Ke4 Rge8+ Qe5 f5+ Ke3 Qe2# Rhg8 appears to be a bit more forced, than the other two. That was not easy for Chest: on a K7/600 with 350 MB hash it needed 18.7 hours. Cheers, Heiner
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