Author: Randall Shane
Date: 07:24:55 12/29/99
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On December 29, 1999 at 09:32:48, Robert Hyatt wrote: >On December 28, 1999 at 12:42:31, Randall Shane wrote: > >>On December 26, 1999 at 12:39:59, Len Eisner wrote: >> >>> <snip> >>> >>>It would be helpful if Chessbase could address this limitation programmatically >>>in Fritz 6 and the other commercial engines in the same way that Bob Hyatt did >>>it in Crafty. Right now, if I want to study the KPP vs. KP ending, I use the >>>Crafty engine because it is the only one that will promote the pawn without the >>>KQP vs. KP tablebase. >> >>Dr. Hyatt, >> How does Crafty handle missing tablebases to avoid the problem above? >> >>Thanks! > > >It is actually not hard, although it is also not optimal. If the initial >position at the root is a mate-in-N tablebase position, but after trying each >legal root move, no mate-in-(N-1) positions were found, it must mean that a >promotion move drops into a non-tablebase position. What I do is simply turn >tablebase probes off, and do a normal search. This is guaranteed to prefer the >promotion if it is safe and if it doesn't stalemate the opponent, which neatly >solves the problem. Thanks. I thought that would be a way to do it, but I guess I was hoping for a silver bullet, which I should know doesn't exist...thanks again!
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