Author: Robert Hyatt
Date: 17:48:19 06/11/01
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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? > >I'm having an idea of another book implementation that I think is quite smart, >but I won't reveal anything yet, primarily because I don't know if it works in >practice, secondarily because it might not be a new idea, tertiarily because it >might not be a smart idea at all :) I _intentionally_ want to miss those transpositions. One classic: 1. e4 e5 Nf3 a6 Bb5. Do you _really_ want to transpose back into the book and play Nc6? Or do you want to rip the bishop and be a piece up in a won game? :) My thinking when I did this scheme was "Crafty will probably play Nc6 if it is reasonable, and _then_ we will transpose back into book after white plays Ba4, because that is a normal position. But the position given above is "not normal" and I won't try to transpose. It has happened in _real_ games in the past. But it won't happen to me here. :)
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