Author: Robert Hyatt
Date: 20:30:48 06/15/02
Go up one level in this thread
On June 15, 2002 at 06:59:58, Shaun Brewer wrote: >On June 14, 2002 at 22:20:23, Robert Hyatt wrote: > >>On June 14, 2002 at 13:34:37, Shaun Brewer wrote: >> >>>Does crafty no longer take into account win/loss ratios in the book.bin file? >>> >>>'book random' appears to only have valid options on 0 and 1 - am I missing >>>something? >>> >>>Thanks >>> >>>Shaun >> >> >>Book random 1 says choose from the best N (you get to set N with book width N >>command) moves based on percentage of the time they were played, etc. You >>also get to set the formula used to set the weights for learning scores, >>frequency of play, etc (book weight command). >> >>Book random 0 is something else. It says to find the set of known book >>moves, and then do a normal alpha/beta search, but _only_ searching that set >>of moves... frequencies/win-lose etc have no influence. > >Thanks for the reply. > >Firstly I must say that crafty is one of my favorite programs - due to its >flexability and strength. I also have Rebel Century3, Chess Tiger, Virtual Chess >so it is not just because crafty is free. > >There used to be Book random 2: choose from the moves with the best win ratio. >Have you found that taking account of the win/loss ratio (appart from in the >book creation) gave no benefit to crafty? That was years ago. Now you can do that by setting the weight for "frequency" to something like 100, and setting the other weights to something small like 0. Then it will choose moves based solely on the frequency they were played. It is much more flexible now than it was back in the days of book random X where X > 1. That was at least 3 years ago, if not more. > >I know you can allocate weightings to frequency, static evaluation learning and >CAP score using the bookw command I was just surprised that the win-loss ration >was not available. The win/lose ratio is used when actually building the book. You can cull moves with a bad win/lose ration then so that the book doesn't contain moves that lose way more than they win, for example. > >Thanks again > >Shaun
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