Author: blass uri
Date: 04:10:23 09/12/98
Go up one level in this thread
On September 12, 1998 at 02:32:41, Bruce Moreland wrote: > >On September 11, 1998 at 21:43:46, Mark Young wrote: > >>Bruce, I would invite you and anyone else that would care to to please go >>through my thought process with me on a line by line basis with me and agree or >>disagree with it. My intention is not to deal in any way with implications >>against Thorsten but to just deal with the facts and if possible to come up with >>cause behind the facts. I think you might more clearly understand my intentions >>by doing this. > >I think that I understand this pretty well. You insinuate that Thorsten is >fiddling with the book. It'd be easy to do, it'd be hard to catch, and if you >saw low probability bad moves coming out of Fritz often enough, and you had >reason enough to believe that the operator had an ideological agenda, it might >even seem like the most likely explanation. > >I know that you, Enrique, Moritz, and maybe Dirk are frustrated by this >tournament. But let us try to figure out a way that we can handle this >situation constructively, without calling people cheaters this time around, and >without making posts where people are indirectly called cheaters. I don't think >this new strategy is much of an improvement over last time. > >I have done experiments with wide automatically generated books. It is hard to >write it properly, so that you don't go down bad lines. If the book is large, >which I expect Fritz's book is, this problem gets worse, not better. > >If you play a move based upon straight frequency, the odds are good that you'll >go down a rare line at least once in a game, and if the rare lines are all bad, >you're going to get screwed up a lot. As a possibly unrealistic example, if you >have a situation four times per game where you have a bad move played 10% of the >time along the line you play, the odds you will play a bad move at least once >are 1 - 0.9^4, which is about 35%. In my book for fritz5(I have no powerbook I found that the probability for one of the moves in the last game of fritz5 15.Kg1(the last move in my book) is 0.8% I read that the probabilities in mark young's power book was also similiar in some games and in one game(against Junior5) the probability for one of the moves of fritz5 was 0% by mark young's powerbook and this proves that mark young does not use the same book. I am interested to know the probabilities for the moves in this tournament. It is easy to check by using the function open tree in fritz5 when fritz5 can tell you the exact probability. The problem is that I have not the book that is used in the tournament so I cannot know. Uri > >If you don't do it by straight frequency, but do it instead by result, you can >still have problems because you'll still go down bad lines sometimes. > >You said you looked at those games Fritz played, and analyzed the opening book >choices that Fritz made. What did you come up with? > >bruce
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