Author: Robert Hyatt
Date: 09:53:01 04/16/00
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On April 16, 2000 at 11:06:16, blass uri wrote: >On April 16, 2000 at 09:53:15, Robert Hyatt wrote: > >>On April 16, 2000 at 09:25:33, Daniel Clausen wrote: >> >>>Hi >>> >>>On April 16, 2000 at 09:11:08, Charlie GOLD wrote: >>>> Crafty analysed the position and showed # in one (Pf8-N #), BUT IT DID NOT >>>>MAKE THE MOVE UNTIL I FORCED IT TO. The other machines made the move in less >>>>than 5 seconds. charlie >>> >>>Some engine continue with the search when they found a mate-in-N on a >>>certain ply in the hope to find a shorter mate. Of course in the case >>>of a mate-in-1 this is a bit silly. :) Maybe you saw this effect in >>>Crafty? >>> >>>Kind regards, >>> -sargon >> >> >>Crafty stops at the right point, _unless_ given a sd=N command. It uses the >>rule of "search to 2*N=1" when it finds a mate in N, just to be sure there >>isn't a shorter mate. In the position you gave, it stopped after 4 plies >>as that is the minimum depth it will normally search to, regardless of the >>mate found... >> >>I don't see how it could continue to search unless it is in infinite mode or >>a specific depth has been given to it... > >I know that under chessbase crafty always use time to play even when it can see >mate in 1 and the only cases that it does not use time are because of the >permanent brain. > >It does not change the result of the game but I saw crafty using 246 seconds to >do mate in 1 against Fritz6 in the ssdf games when it was under chessbase >interface. >It has nothing to do with underpromotions. > >Under infinite time control it will never play because it "believes" that it has >to use time. > >Uri That is interesting. I have no idea how the GUI could make it take a long time, unless it is setting the time limit wrong. IE Crafty has a st=N command that says use N seconds of time. But that is the wrong way to play games as it will always take N seconds, never any less (on easy moves), never any more (when the score drops drastically). Can you (or someone) send me a log file from where this happens? I'd like to find out why it is doing something it won't do under winboard or in text mode. Bob
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