Author: leonid
Date: 14:21:59 09/27/01
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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! Hi, Paul! >Pretz says White mates in 9, it takes longer than I thought on my 1GHz P3 >though, a full 16 seconds: Actually your time is very good! Mine found for whites in 12 seconds by selective. On a position that is 9 moves deep, ten folds difference is completely acceptable. >00:16 WM9 06 Nh8+ Rxh8 Nxd6+ Kg7 Rxg4+ Neg5 Rxg5+ Nxg5 Qcxg5+ Qxg5 Qhxg5+ Qg6 >Qgxg6+ Kf8 Qae8+ Rxe8 Qxe8# > >With Black it's a lot easier, a mate in 8 in 1 second: Close to mine that is 0.27 sec in selective. To my surprise, blacks found mate in 8 moves by brute force more quickly that by selective. Eight moves deep demand only 0.11 sec by brute force against 0.27 by selective. Brute force is very quick for blacks. It took only 40 seconds for 7 moves search to say that mate is not there. LLchess. Celeron 600Mhz. No hash. >00:01 BM8 08 Qxa4+ Kxa4 Nxc5+ Bxc5 Bb5+ Kxb5 Nxd4+ Nxd4 Qxc5+ Ka4 Qdd7+ Nb5 >Qcxb5+ Kb3 Qa4# > >This is all done with a selective nullmove search. > >Best wishes to you and your family, The same for you, Paul! Leonid. >Paul
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