Author: leonid
Date: 19:06:37 01/18/01
Go up one level in this thread
On January 18, 2001 at 19:13:22, Paul wrote: >On January 18, 2001 at 19:01:08, Pete Galati wrote: > >>On January 18, 2001 at 18:44:05, leonid wrote: >> >>>Hi! >>> >>>If you would like to find a mate here is one position. It is very easy to solve >>>but not that simple to find shortest mate. >>> >>>I failed here even in 3 hours to find shortest mate through brute force search. >>>Maybe you will have better chance. >>> >>> 1k4q1/1pppPr2/PbbP1N1n/QP2rn1R/1q6/1q2RBB1/q1q2PPP/6NK black to go >>> >>>Leonid. >> >>Is this the right position? >> >>[D]1k4q1/1pppPr2/PbbP1N1n/QP2rn1R/1q6/1q2RBB1/q1q2PPP/6NK b - - 0 1 > >If so, then mine says it's a mate in 10 for black starting with Nxg3+ ... >It looks like a daily reverse auction ... Anyone lower, anyone? :) > >Paul Position is exact and response 10 moves must be or shortest possible, or very close move. Actually my program solved this position through selective search in 11 moves. Solution was instant. Finding shortest mate is the other story. Through brute force program said in 8 mate is not there. Only 9 still could be looked. I found that branching factor was terrible to see 9 moves. AMD 400Mhz. 8 moves - 2h 44 min. 7 moves - 2 min 48 sec. 6 moves - 7 sec. Leonid.
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