Author: Matthew Herman
Date: 11:32:36 12/13/98
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On December 13, 1998 at 10:11:16, Robert Hyatt wrote: >On December 13, 1998 at 08:18:34, Matthew Herman wrote: > >>On December 13, 1998 at 00:22:27, Robert Hyatt wrote: >> >>>On December 12, 1998 at 20:09:19, Matthew Herman wrote: >>> >>>>I recently compiled the tablebases for Crafty 16.1 (eugene nalimov format). Then >>>>I created the crafty.eng (with the winboard.eng). Then I showed it a KBNK >>>>position .. great it found the stuff from the tablebase.. then I showed it a >>>>KRKB position and it didn't!?!?! what gives?? Please shed further light.. thanks >>>> >>>>P.S. This also happened on winboard.. >>>> >>>>Matt >>> >>> >>>do you see files krkb.nbb and krkb.nbw in the directory? If not, that >>>is the problem... >> >>Yes, I generated all of them into that folder.. and I do see it. Also KRKN >>doesn't work either. It's that some work and some don't > > >Just a minute... I forgot about something. Check your log.nnn files for games >like KR vs KN. Look at the top, before the start of the search, to see if you >see the message "drawn at root, trying for a swindle." > >that means this is a known tablebase position, that with best play it is a >draw, but crafty has a material advantage. Rather than just playing any move >that leads to a draw, based on randomly which move it searches first, which >might well choose RxN as the move to play, even if KxR is the reply. This >"swindle" mode does a normal search instead, but *only* considering the moves >that lead to a draw.. which lets it make the draw as difficult as possible for >the opponent. IE ie KRP vs KR, many are draws, and in choosing a position from >the tablebases with a score of 0, it might give up the pawn and make the draw >trivial. Now it holds on to the pawn as long as possible to give the opponent >a chance to make a mistake and take the draw into a won position for crafty... > >Bob Umm yes thats nice and I found it in the log files.. but HOW can I see that analysis .. should I assume then it is drawn? what if there is one drawing move in the position?? Crafty will say that drawn at root, trying for swindle and I wont get to see what that only move is? Thanks, P.S. Awesome program! When are you getting the quad xeoN?
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