Author: Robert Hyatt
Date: 17:50:17 06/11/01
Go up one level in this thread
On June 11, 2001 at 17:44:55, J. Wesley Cleveland wrote: >On June 11, 2001 at 14:17:37, David Rasmussen wrote: > >>Am I an idiot, or does that Crafty book scheme miss some transpositions, because >>of it's clustering system? Wait, those two statements aren't mutually >>exclusive... >> >>When some of the upper bits of the book hashkey, is from the parent position, >>doesn't that mean that if I'm in an unknown position, that can make a move that >>transposes into a book position, it won't, because the upper bits will only >>match the actual parent position(s) from when the book was created? > >Right, the only transpositions crafty finds are those that have been played in >the pgn the book was created from. This prevents crafty from making stupid >transpositions, e.g. e4 e5 Nf3 Nc6 Ng1 Nb8?? Not quite. The above is found because Nb8 is a two-fold repetition and the book code won't play it. If that is the only move, crafty will have to do a search to find another, although the search will recognize that Nb8 is not a true draw since it is only the second repetition. Crafty will transpose from line to line, opening to opening, just like any human will But it has to be a legitimate transposition, not one like the other example I gave in a previous post...
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