Author: Harald Faber
Date: 00:39:27 02/01/00
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On February 01, 2000 at 01:57:38, David Blackman wrote: >On January 31, 2000 at 16:18:35, Dann Corbit wrote: > >>On January 31, 2000 at 09:44:09, Harald Faber wrote: > >>>BTW has anyone done the conversion from the book.bin and books.bin into a >>>Fritz-tree? I guess not, I don't know of any converter that does this job, and >>>even creating the tree from the pgn-file does not take the priorities... >> >>I don't think it is invertible. The hash is stored in the book, not the >>position. You would have to write out some kind of key-file at creation time. > >Start at the starting position. Generate all legal moves. Try each legal move >and then generate the hash, see if it matches any in the book. For the ones that >do, generate all legal moves, and so on recursively. You can re-create all the >book positions in time roughly proportional to book size times number of legal >moves in a position times whatever it costs to access a single position in a >crafty book given the hash. > >The only bit that looks at all hard is generating Fritz-tree format at the end. >Is that format documented? > >I'm not interested in doing this personally since i don't own Fritz. But i did >tree taversals for various reasons with my own hashed book format, until i >decided the book was more trouble than it was worth. So it seems to be best to take the pgn file, import it into a tree or build a new one from it and change the prefernces manually...
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