Author: Heiner Marxen
Date: 02:16:30 09/28/01
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On September 27, 2001 at 16:09:10, Paul wrote: >On September 27, 2001 at 15:14:39, leonid wrote: > >>Hi! >> >>The next position is easily solvable for white and for black side. Even if you >>will look for solution by brute force it could not very slow. >> >>[D]2rqqr2/R1q2k1B/1B1qn1N1/p1Q2N1p/Qb1RR1qQ/1Kp2nQ1/2QpbP2/3QN3 w - - >> >>Please indicate your result. >> >>Thanks, >>Leonid. > >Hi Leonid! > >Pretz says White mates in 9, it takes longer than I thought on my 1GHz P3 >though, a full 16 seconds: > >00:16 WM9 06 Nh8+ Rxh8 Nxd6+ Kg7 Rxg4+ Neg5 Rxg5+ Nxg5 Qcxg5+ Qxg5 Qhxg5+ Qg6 >Qgxg6+ Kf8 Qae8+ Rxe8 Qxe8# Hi Leonid, Hi Paul! Here the confirmations from Chest (on K7/600 with 350 MB hash)... With white to move there are 3 solutions in 9 moves (4.2 hours): PV: Nh8+ Rxh8 Nxd6+ Kg7 Nxe8+ Rxe8 Qge5+ Nxe5 Qxe5+ Kh6 Qhf6+ Qxf6 Qxf6+ Kxh7 Rxg4+ Bd3 Qxd3# PV: Rxc7+ Rxc7 Nh8+ Rxh8 Nxd6+ Qxd6 Rf4+ Nxf4 Rxf4+ Kg7 Qgxg4+ Ng5 Qhxg5+ Qdg6 Qgxg6+ Qxg6 Qgxg6# PV: Qxe8+ Rxe8 Nh8+ Rxh8 Nxd6+ Qxd6 Rf4+ Nxf4 Rxf4+ Qf5 Rxf5+ Qf6 Rxf6+ Ke8 Bg6+ Qf7+ Bxf7# >With Black it's a lot easier, a mate in 8 in 1 second: > >00:01 BM8 08 Qxa4+ Kxa4 Nxc5+ Bxc5 Bb5+ Kxb5 Nxd4+ Nxd4 Qxc5+ Ka4 Qdd7+ Nb5 >Qcxb5+ Kb3 Qa4# Yes, it is easier, and the above move is the only solution (21.08 sec): PV: Qxa4+ Kxa4 Nxc5+ Bxc5 Bb5+ Kxb5 Nxd4+ Nxd4 Qxc5+ Ka4 Qgd7+ Nb5 Qcxb5+ Kb3 Qa4# Cheers, Heiner >This is all done with a selective nullmove search. > >Best wishes to you and your family, >Paul
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