Author: Dieter Buerssner
Date: 10:57:56 01/19/01
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>Crafty17.14 cannot see a forced mate for white after Rb6 in a few minutes and >after more than 10 minutes on PIII450(11:19) it can only see 12.76 pawns for >white at depth 20. > >Deep Fritz and Crafty need some minutes to avoid Rb6 in the original position >and are slightly faster than Yace in this task but they do not see the forced >mate. > >I see often in analysis that Crafty can see that white wins a pawn in the main >line but it cannot see a forced mate or a draw inspite having the KRP vs KR >tablebases. > >I guess that something like this cannot happen to yace. I accidently have changed the "TB-strategy" in Yace yesterday night. Therefore I also was interested in this position. I believe the reason for different behaviour of the programs here is the decision of the programmer, when to probe TBs. Earlier versions of Yace did not probe TBs, when very deep in search (at the last ply, or in lines, where many extensions have been executed). But this yields in inconsistences, and in the behaviour you noted above. The pawn capture will be delayed, until a depth, where no TB access is done anymore. But probing throuhg the whole search has the disadvantage, of possibly much less speed. Actually, with another strategy, in the position above Yace could avoid Rb6 after 1 minute. In other postitions I tried, probing throughout the whole search (I did not try probing in quiescence search) showed faster solving times. I do not know yet, which is better. -- Dieter
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