Author: Stan Arts
Date: 01:20:13 03/22/04
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>[D]3R1B1K/5p2/2p2p2/b1rPNP1n/q1rkNP2/1Pp2Q1p/1n6/5B2 w - - bm Re8;id mate in 4, >Re8, Qxb3, Nxc5, Rxc5, Nxc6+, Rxc6, Qe4++; > >Tricky mate in 4 for dedicated machines and for some Null movers. > >Problem composed by L. Zagoruiko in 1972. > >Bill Hi Bill Neurosis 1.7 48 MB hash, PIII-550 Legal moves: 50 Static score: -321 Ply Score Time Nodes Best move and expected line ------------------------------------------------------------ 2 538 6 4091 Nxc4 Bxd8 3 749 11 6418 Nxc4 Rxc4 bxa4 3 809 17 13677 Bxc5+ Rxc5 bxa4 3 889 28 20241 Nxc5 Rxc5 Qf2+ Ke4 Qf3+ Kd4 Qf2+ Ke4 Qf3+ Kd4 4 889 149 125583 Nxc5 Rxc5 Qf2+ Ke4 Qf3+ Kd4 Qf2+ Ke4 Qf3+ Kd4 5 939 462 374995 Nxc5 < + > Rb4 Nxa4 Bxd8 Bxb4 5 1190 500 408426 Nxc5 < + > Nd1 bxa4 Rxc5 dxc6+ 5 1929 528 435257 Nxc5 < + > Nd3 bxa4 c2 Qe4+ 5 9991 709 571575 Nxc5 <M5> Rxc5 Bd3 c2 Qf2+ Kc3 Qxc2+ Kb4 Bxc5+ 6 9991 3636 3013753 Nxc5 <M5> Rxc5 Bd3 c2 Qf2+ Kc3 Qxc2+ Kb4 Bxc5+ 7 9991 8519 6923596 Nxc5 <M5> Rxc5 Bd3 c2 Qf2+ Kc3 Qxc2+ Kb4 Bxc5+ 7 9993 14644 12053840 Re8 < + > Rb4 Nc4 Qb5 Qf2+ Kxd5 Nxc3+ 7 9993 14781 12160776 Re8 <M4> Rb4 Nc4 Qb5 Qf2+ Kxd5 Nxc3+ Total nodes:17305087 n/sec:81100 (Q-nodes:2% max depth:18) My program suggests a different line, but there seem to be a few possible ways to mate in 4 after Re8. Greetings Stan
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