Author: Thorsten Greiner
Date: 00:54:22 03/22/00
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On March 21, 2000 at 12:54:16, Pete Galati wrote: >As it is now, and without adding Dann's pgn files yet, a 13.2mb pgn compiles a >20mb book with Amy, so I expect it to end up being on the large size before I'm >done, I'm hoping Amy doesn't have a limit. Amy's a cool little program. Pete, Amy internally uses an open source but commercial grade database engine called Berkeley DB (see http://www.sleepycat.com). I am not aware of any size restrictions Berkeley DB has, other than those of the underlying operation system (many OSes limit file sizes to 2 GB). To index the database Amy uses a 64 bit integer which is computed using the usual Zobrist hashing function. There is a very tiny chance that to non-identical positions hash to the same 64 bit integer, so that a bad opening move might be played. But I do not consider this to be relevant in real life. In the 0.7 version of Amy which I will release shortly the book size is decreased a little bit. Also you will have the option to 'flatten' (is this a good english word for what I mean) the opening book by removing positions which occur less than 'n' times. Even for n=1 I found that opening books reduce to 1/10th of the original size. Hope you enjoy Amy -Thorsten
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