Author: Mark Rawlings
Date: 14:56:09 01/31/05
Go up one level in this thread
On January 31, 2005 at 04:37:52, Uri Blass wrote: >On January 30, 2005 at 21:25:09, Mark Rawlings wrote: > >>On January 30, 2005 at 13:28:17, Duncan Roberts wrote: >> >>>On January 30, 2005 at 12:53:11, Helmut Conrady wrote: >>> >>>>On January 30, 2005 at 10:56:55, Mark Rawlings wrote: >>>> >>>>>Very interesting! >>>>> >>>>>Is the KRNKNN mate in 262 still the longest tablebase mate?? >>>>> >>>>>Mark >>>> >>>>Yes these 523 plies are the longest DTM so far. I expect this record holds in >>>>the 6 piece endings. >>>> >>>>Helmut >>> >>> >>>was it always suspected, it would be the longest, or did they know only after it >>>was done. >>> >>>do you have any thought on longest 7 piece and how long ? >>> >>> >>>duncan >> >>I was always thinking that the egtbs with pawns would have the longest mates, >>but I guess that's not the case. > >I guess that you do not consider the 50 move rule. > >Mate in 150 moves with no pawns(6 pieces) is simply a draw if my memory is >correct and the same for mate in more moves. > >1.*** > >50...capture >51.*** >100...capture >you already have 4 pieces and it is a draw or mate in less than 50 moves(I am >not sure what is the longest mate but if I remember correctly it is less than 50 >moves). > >I am not sure what is the longest mate for every tablebase of 4 pieces and I >think to write a program to calculate it based on movei structure by having a >loop on all possible 4 piece positions and probing the tablebases. > >Knowing the correct values for every position can help me to check if I have no >bug in the program that probe tablebases. > >Uri Right. I was not considering the 50-move rule since the tablebases don't take that into account. It's really more of a theoretical topic for me. (I never did like the 50-move rule, since it's always possible that the rule could be changed.) Mark
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