Author: José Carlos
Date: 13:27:23 01/02/01
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On January 02, 2001 at 16:10:53, Christian Söderström wrote: >On January 02, 2001 at 15:36:45, Jon Dart wrote: > >>On January 02, 2001 at 05:30:07, Christian Söderström wrote: >> >>>So I am left with 4 bytes. I want to use these to store statistics >>>about the move, to support a future book-learning function. But the >>>thing is I'm not sure what information would be most useful to store! >>> >>>I have a couple of ideas obviously but I am very interested to hear >>>any ideas others might have. 4 bytes is pretty much, but not enough >>>to get too crazy :) >>> >> >>Arasan implements book learning by keeping a float value (which you >>can store in 4 bytes) for each position. If it gets a big + score a >>few moves out of book, it goes back and ups the float value for >>the last book move and (in decreasing amounts) the preceding book >>moves. Similarly it decreases the scores if the score a few moves >>out of book is bad. >> >>Crafty does something similar. The idea is that in subsequent >>games you favor moves with positive learned values and avoid moves with >>negative learned values. >> >>This is certainly not foolproof and not very sophisticated but it's >>at least a basic form of learning. > >Something like that definately works. Isn't a float a bit >overkill though? (No pun intentended) > >Anyway I always figured one of the big points of adding >learning was that the program would avoid playing openings >which it plays poorly long-term, not just those that result >in bad positions a few moves out of book. For instance, >Mint often plays the french with black now, and does very >poorly (especially against humans), however it doesn't >understand that it's doing badly (and in fact it might >objectively be fine) until it sees a material-winning >or mating attack 30 moves in the game. > >So isn't it possible to supplement your idea by also >learning from the end-result of a game? Of course many kind of sophisticated learning technics are possible, but in such cases (like the french you talk about) I see it easier to build a book where the french is forbidden for the program. Right now, I'm working on Averno's book that way, and results are becoming better. José C. >- Christian > >>--Jon
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