Author: Robert Hyatt
Date: 06:46:55 11/13/97
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On November 13, 1997 at 02:28:59, Roland Pfister wrote: >On November 12, 1997 at 11:43:51, Robert Hyatt wrote: > >> >>I have not yet been able to re-annotate the entire game. But O-O is now >>producing a reasonable score, and if it had to play O-O, it would follow >>it with g6 as you suggested. And the score is now fairly close to the >>other moves, rather than being -8 worse. :) >> >>The position learning is a problem. I generally have everything on, as >>the >>default. However, I'm thinking about making this learning option "off" >>by >>default as I get plenty of questions about the results this can cause. >>If >>you play down the O-O line a ways with position learning on, it can >>remember >>a bad position, and then when you back up and try O-O, the result of >>this >>bad position can filter into the evaluation and make analysis *very* >>confusing. > >Position learning should speed up the search/analysis. If you get a >wrong score from position learning I suspect a bug somewhere. > right. but in this case, the "wrong score" was caused by my backing up and going forward, and restricting what crafty could search. IE, telling it at ply=2 to *only* consider one particular move. That still gets backed up like a normal score, and then gets learned. I should simply turn it off in debug mode, but I didn't... and my fooling around with what was searched here and there made some of the scores backed up to the root not very meaningful. But it dutifully learned them anyway. :) >The only problem I see with position learning is if you change >evaluation >in the meantime and use your old learn file with positions learned >by the old evaluation. > >>It works great for those players that want to learn a >>particular >>opening, and discover that Crafty isn't very well booked for this >>particular >>variation. It will still "learn" what is going on and continually find >>new >>and better ways to defend, until it "solves" it or you continue to find >>different ways to continue... > >That is book learning or did I get it wrong? Not in Crafty, because I don't add to the book. If you take it out of book, it then will use position learning to work its way around the various traps you lay for it.. and even out of book early, it won't continue to play a line that loses later..
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