Author: leonid
Date: 05:23:00 09/28/01
Go up one level in this thread
On September 28, 2001 at 05:16:30, Heiner Marxen wrote: >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# My pleasure to see you once again! Thanks for results! See you later, Leonid. >Cheers, >Heiner > > >>This is all done with a selective nullmove search. >> >>Best wishes to you and your family, >>Paul
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