Author: leonid
Date: 10:25:59 01/03/01
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On January 02, 2001 at 22:45:34, Pierre Bourget wrote: >On January 02, 2001 at 19:55:49, Dann Corbit wrote: > >>On January 02, 2001 at 19:47:48, Pierre Bourget wrote: >> >>>Hi Dann, could you give us the source (book or magazine)of the problem. >> >>I think the mystery is solved. It wasn't FIDE chess, but (rather) a chess >>variant called Chancellor Chess: >>http://www.chessvariants.com/usualeq.dir/chancellor2.html > >Here is a true mate in 5 with the same materiel by the great Sam Loyd ,Chess >Monthly 1857. >Very easy for any computer but beautiful in his simplicity. > >Pierre > >[D]8/8/8/8/8/Q7/4p3/5k1K w - - 0 1 This position is really 5 moves mate.My program was not able to solve it through any selective mate search. Only brute force search succeeded. AMD 400 Mhz solved in 1 second. Mate solver in LLchess. Just changed this position by adding few more pieces. This position demand more moves that original for mate. New position: 1R2R3/8/8/6NN/2p3n1/Q2n1p2/4pb2/5k1K White to go. Could solve it by selective search but not by the most speedy. Mate was found 9 moves ahead in 9 second. Don't know exactly how far is shortest mate. Only found that in 6 move it not existe. Too long for me to see farther. My program don't use hash table. Maybe somebody else will say exact number of moves that lead to mate. Leonid.
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