Author: blass uri
Date: 07:07:56 05/11/00
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On May 11, 2000 at 08:33:26, Mogens Larsen wrote: >On May 11, 2000 at 05:36:42, blass uri wrote: > >>I also believe that other beta testers did not think about part of my productive >>ideas for chess programs. > >Out of curiosity, what productive ideas have you been suggesting? > >Sincerely, >Mogens I will repeat one idea that I posted here: Many programs are null movers and they prune moves when they see no threat. I found that Crafty could not find some tactics in practical games because it pruned threat mate moves. I suggested that before the decision if to prune by null move to check also if there is a mate threat to bigger depth(If it seach d plies for regular threat it can search d+1 or d+2 plies for mate threat) I think this will help crafty to see tactics when there is a mate attacks and I think that crafty will not be significantly slower when there is no mate threat because checking if there is a d+1 plies mate threat is easier than checking if there is a d plies not mate threat). Crafty can call chest(a free program that is the best mate solver) to check if there is a mate threat and chest is a very fast mate solver(it tries to prove that there is no mate with the smallest possible tree and it helps it to see that there is no mate very fast). I read that it is a slow searcher and search only 20000 nodes per seconds on a slow hardware p166(I am not sure if I am right about the hardware) but it can solve 1500 mate in 2 in one second. Crafty on p166 needs significantly more than 1/1500 second in order to search 3 plys threat when these threats can miss mate in 2 because crafty's evaluation also has no idea if the position is mate so it may need more than 2d-1 plies to see mate in d threat not only because of null move. Uri
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