Author: Uri Blass
Date: 23:52:56 01/07/04
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On January 08, 2004 at 01:36:30, Ed Trice wrote: >Something happened during ply 5 of the iteration. I am not sure if I am doing >the perft properly since it required a great deal of unraveling of the move >generator. I also was spawning large text files, writing every move to disk as a >double check. > >The first four plies have been computed. I got "0 moves" for black after Ah3 j5 > Ae6 which is an Archbishop checking black with no mate or stalemate.The full >program handles this with no problem, so again, it must be something I whacked >doing perft. > >total 1-ply positions = 28 >total 2-ply positions = 784 >total 3-ply positions = 25,112 >total 4-ply positions = 828,560 > >An error occurred counting the positions >at ply 5 for: Ah3 j5 Ae6 > >0 black replies >checkmate: no >stalemate: no >black pieces: yes > >total 5-ply positions > 29,393,835 perft 5 is the number of legal games of 5 plies. perft 5 is not the total 5-ply positions. The total 5-ply positions is smaller because you may get the same position in different order of move. perft 1 and perft 2 are the number of 1 ply position and 2 ply position respectively because in that case you cannot get the same position by different order of moves. Uri
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