Author: Ross Boyd
Date: 17:31:34 01/24/05
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On January 24, 2005 at 18:19:21, Alessandro Scotti wrote: >On January 24, 2005 at 17:36:21, Eric Oldre wrote: > >>I'm interested in knowing which free engines will give you a static >>evaluation. (I think that is the term) >> >>ie. given a position, what score would the eval function return for >>this position. NOT doing any search. > >Hi Eric, >my engine Kiwi has an "undocumented" command that I use for testing. You have to >run the program in a console window and type "evalt" followed by the name of a >file containing an EPD test suite, for example: > evalt wac.epd >It should tell you something like "300 positions examined, 0 errors". Then, the >log file "kiwi_log.txt" contains the evaluation for all positions in the suite >(it's the number after the "=" sign). >Note that for each position you will also see a "mirrored" board, which the >program also evaluates to see if there are differences in evaluating black and >white pieces (if so, it's a bug)... very useful stuff for debugging evaluation >code, I think it was Ross Boyd of TRACE that suggested this technique in a >forum. No Alessandro, I got it from somebody else too.... possibly Michael Langfeld? I must say it has proven helpful in finding eval symmetry bugs. BTW, TRACE also has an undocumented "eval" command... but it only works for the current position ... OR you can build a trace.cfg with a script of "setboard <fen>" positions and the "eval" command after each one... (ick) or use the undocumented "testsuite <epdfile>" command... it creates a log file but only has the static eval score... no breakdown of terms... sorry. I plan to redo the eval with a debug mode that outputs each eval term but, I plan a lot of things, who knows when it will actually get done? :-) >Of course Kiwi's evaluation is nothing to write home about, but I can't offer >anything better at present! :-) You are making great headway! Cheers, Ross
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