Author: Yakov Konoval
Date: 00:26:40 10/18/05
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>> >>For 64-piece tablebases MaxDTC = 1. > >more than 32 pieces are illegal positions and I do not claim that this rule is >always correct but only that there is no reason to think that 7 will be the >first exception. > But theoretically there is the number_of_pieces < 64 with absolute MaxDTC or MaxDTZ value. Moreover for 6-man tablebases with pawns MaxDTZ << 243. And for 6-man tablebases krnknn(243), krbknn(223), and krbkbn(near 190) are rary exceptions. For non-standard boards MaxDTC may be really very large. 2 years ago I wrote one program for unusual boards, unusual pieces and unusual rules. According to this program in knk-ending white always can force stalemate on 6*N board with speedly increasing Distance_To_Stalemate. > >The first exception may be 7 pieces,8 pieces,9 pieces,10 pieces,11 pieces,12 >pieces,13 pieces,... > >> I think, that 290-move record may be >>improved, but there are no position with MaxDTC >= 243*2. > >Not all the 7 piece tablebases were investigated so we do not know that there >are no position with MaxDTC>=243*2 > >My guess is that MaxDTC>=243*2 and MaxDTZ>=243*2 but we will probably need to >wait at least few years to see who is right. > There are 736 7-man pawnless EGTs in our (with Marc) metric. About 40 of them are already done. Many of remaining EGTs are not interesting. But calculation of all 7-man EGTs really may take a few years (or a few hundred computers + a few weeks). And from these 40 EGTs we already have 5 EGTs with MaxDTC >= 200. Yakov
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