Author: Pete R.
Date: 09:17:18 08/20/99
Go up one level in this thread
On August 19, 1999 at 21:10:35, Robert Hyatt wrote: >On August 19, 1999 at 17:24:20, Pete R. wrote: > >>On August 19, 1999 at 15:13:23, Robert Hyatt wrote: >> >>>On August 18, 1999 at 20:35:00, Pete R. wrote: >>> >>>>I have a position as follows: white has king and rook, black has king knight and >>>>pawn. I have the knpkr tablebase files. When it's black to move, the tablebase >>>>returns the value instantly. However when it's white to move the program thinks >>>>while doing tablebase hits, presumably on the 4 man set. Evidently I don't >>>>understand tablebase files, so could someone explain to me what's going on here? >>>>Knpkr only applies to white having knp?? >>> >>> >>>Are you talking about crafty here? If so, look to see if you see "drawn at >>>root, trying for swindle..." in the output, or else do "swindle off" to disable >>>"swindle mode" >>> >>>If the position is a draw at the root, crafty tries a search to give you a >>>chance to make a mistake and lose. >> >>I just posted below on that before reading your response. I did see the "drawn >>at root, trying for swindle" when I kicked it out of analyze move. I just >>repeated the test in analyze mode with a kbpkr position with white have k+r. >>Even though I tell Crafty to analyze, when it's on analyze.white, I put in a >>move and it returns immediately with no depth, time, score, or variation values. >> Then on analyze.black I make a random move and it comes back instantly with an >>EGTB move and a score like MAT20. Then I make the suggested move on >>analyze.white and again nothing is returned. This happens even with swindle >>off. >> >>In the Chessbase interface the behavior for both Hiarcs and Crafty is similar to >>this, when one side is on move the 5 piece tablebase is hit instantly, on the >>other side it starts analyzing, while getting thousands of tablebase hits, which >>must be on the 4 man subset. ?? > > >First, I guess that means that ChessBase likes the way I handle tablebases, >if they copied it. :) > >As far as the rest of your question, it depends. If you are using the >chessbase CD, it doesn't have anywhere near all of the 5 piece files, so >anything can happen. The only time crafty does a search is when the position >is a draw and it wants to give you a chance to make a mistake... Otherwise, no >ideas... I have all the 4 man and downloaded a bunch of 5 man sets from your site. For example I have kbpkr.nbb.emd and kbpkr.nbw.emd. I set up a kbpkr situation, and set Crafty to analyze mode. When I make a move for one side, I get the EGTB value returned, e.g. MAT19. But then when I make a move for the other side, no EGTB value is returned. I suppose this isn't strictly necessary in analyze mode, but it is a bit confusing. This happens whether or not swindle is on. For the Chessbase engine versions of Crafty and Hiarcs this sort of behavior must be the default.
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