Author: Robert Hyatt
Date: 10:41:24 07/27/00
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On July 27, 2000 at 13:10:44, pavel wrote: > >is it possible to make crafty acces the position.lrn the same way it accesses >the egtb? in this case, you dont have to worry about loading the lrn file every >time to the hash table, and also the size wont be a problem. since crafty can >deal with 20gb of egtb it shouldnt be a problem with few mbs of learning file. >Or am I wrong ? will it cost crafty some speed ? or it is not possible to code >is such way? The problem is this: And EGTB has all possible scores for a given set of pieces. The position.bin file has a few positions from wildly separated positions in many games. A hit is so unlikely it hardly ever happens. It is most useful when someone takes crafty out of book, and for the first 10 moves, Crafty is doing fine, but then they walk it into a trap it didn't see. Prior to "result learning" this could cause problems, as the book line looks fine, but it loses later. With position learning, it will _still_ play the same book line, but it will vary and play a different move somewhere before the point where it failed low and lost when the position was saved. In tournaments, I would not use it at all, since I would never let it play the same opening twice in one tournament... On ICC, it helps sometimes, but the book is wide enough that it isn't used very much at all. I doubt it would affect it much if it was turned off. >but if you look at the bright side, "if" crafty comes in the same position twice >things will be "faster for him to search", he will know the outcome of the game >within his evaluation. I know the possiblity of crafty coming to same position >is "dubious", but if you play 1000s of games doesnt the possibility gets >narrowed? also it is possible to make crafty "learn" through analysys within >CDB, its faster and effective IMO. or you can create a "universal" learning file >from thousands of games played by crafty online. >well I may be wrong since I a not an expert. >but IMO its not a bad idea............. yes IMO ;) >thanks >pavel. > >ps, ofcourse the post is mainly indicated for Dr, Hyaat, but others' comments >are appreciated. thanks. pavel
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