Author: Robert Hyatt
Date: 18:10:35 08/19/99
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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...
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