Author: Heiner Marxen
Date: 07:48:55 02/14/00
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On February 13, 2000 at 20:52:57, leonid wrote: >On February 13, 2000 at 09:25:18, Heiner Marxen wrote: > >>On February 12, 2000 at 10:18:44, leonid wrote: >> >>>Hello! >>> >>>Please give your position that contain mate between 4 and 8 moves. Would like to >>>know the speed at which usually logic solve mates. I did this four years ago, >>>but then I was alone. Now data could be more diversified and useful for me as >>>for somebody else. >>> >>>Until now positions presented here were almost all the time beyond 9 moves (18 >>>plies). This make solution too long to find. >>> >>>Please indicate your hardware and your game. >>> >>>I will give, for start, one very simple position that contain mate in 6 moves. >>>White to go. >>> >>>[D]1q2kr2/rB2bbP1/3p1n2/1NpP2BN/P4P1p/1P2Q3/6PP/R3K2R w >> >>Are you sure this is the intended position? According to Chest there is >>no mate in 6. What is the intended main variation (PV) ? >> >>Heiner >> >>>Thanks for your next position! >>>Leonid. > > >Very Sorry!!!!! My mistake! I is good that I came to the Club. Was all the day >in my writing. I must for sure next time use, like you, graphics. It can reduce >the mistakes. > >ON G7 MUST STAY WHITE PAWN. Now it is black. Ok, I corrected the diagram above, and viola: there is a solution :-)) Chest on a P/133 with 10 MB hash table needs 522.44 seconds to find: Nxf6+ Kd8 Qxe7+ Kxe7 Nd7+ Kxd7 Bc6+ Kc8 gxf8Q+ Be8 Qxe8# For a complete solution tree it needs 571.51 seconds, and find e.g. that 2.gxf8Q+ and 2.gxf8R+ are also solutions. >Today are so many good positions to try but it is too late for me. Will come >back tomorrow to try few. > >Once again my excuses, >Leonid. You are welcome! Thanks for the problem! It is not exactly easy for Chest. Heiner
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