Author: Dan Homan
Date: 20:40:08 11/18/00
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On November 18, 2000 at 23:23:27, Brian Richardson wrote: >On November 18, 2000 at 23:06:36, Dan Homan wrote: > >>I've just put a new version of EXchess up on my website: >> >>http://pc.astro.brandeis.edu/BRAG/people/dch/chess.html >> >>The new version (v4.01) adds Temporal Difference evaluation learning to the >>previous version (v3.14). I am not sure that this really increases the strength >>of the program, but it was fun to work on. There are a couple of other minor >>enhancements to the search and opening book code. >> >> - Dan > >About how many games with TD learning have been played and did it change your >evaluation function much? I've played hundreds of games, but I've also reset the learned values back to the original parameters many times as well. For the parameters which come with the released version, I am not sure how many games contribute. Another wrinkle is that the program only 'learns' after a loss, so the number of 'learning games' is smaller than the number of games played. One consistent result is that TD learning wants a smaller value for passed pawns than I was using before (about 75% of my original 'hand-tuned' value). Also my knight-outpost and bishop-outpost values are consistently increased by the TD learning by a factor of 3 or 4. - Dan
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