Author: David Rasmussen
Date: 03:00:44 06/12/01
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On June 11, 2001 at 20:48:19, Robert Hyatt 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? >> >>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. :) But still, you're saying: "I'm afraid of that situationm so I won't do _any_ transpositions from non-book positions to book positions", which is not as nice as being able to do it from everywhere, while still taking care of the problem you mention. I don't have a solution for this, but don't you think a solution with those properties would be nicer?
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