Author: Uri Blass
Date: 15:40:50 07/03/03
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On July 03, 2003 at 18:22:14, Robert Hyatt wrote: >On July 02, 2003 at 16:46:57, Uri Blass wrote: > >>On July 02, 2003 at 12:47:00, Russell Reagan wrote: >> >>>On July 02, 2003 at 08:33:36, Michel Langeveld wrote: >>> >>>>Does a (bugfree) program need 26 ply, 18 ply, or different to see that this >>>>position is > 2. (normal plies, no pawn, singulair extensions). >>>> >>>>I think a normal ply searcher needs more as 18 ply to see in all variations that >>>>the f5 or b6 goes off the board. >>>> >>>>How much ply does your program need? >>>> >>>>[D]8/k7/3p4/p2P1p2/P2P1P2/8/8/K7 w - - >>> >>>I believe you need 26 ply without a hash table, and 18 ply with a correctly >>>working hash table. This position is usually used to test whether or not your >>>hash table is working correctly. >> >>I believe that you cannot say how much plies a program needs without knowing the >>extension and pruning rules that it is using. >> >>Uri > >I don't think he meant 26 plies of search depth. He meant 26 plies of >moves. There aren't going to be any extensions in this position until a >pawn gets captured, which means a depth of 26 plies is needed without some >serendipitous help from hashing. I think that it depends on the program. Crafty does not use extensions until a pawn gets captured and the same is for movei of today but it does not mean that it is the case for all programs. Uri
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