Author: Angrim
Date: 13:04:03 04/04/03
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On April 04, 2003 at 15:06:37, Russell Reagan wrote: >On April 04, 2003 at 14:57:50, Keith Evans wrote: > >>What do you think you will gain by excluding certain elements? > >I have heard people discuss the drawbacks of including the fifty move counter in >the past. I'm not sure of the details though. > >As far as an example, try this: > >[D] rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq e3 0 1 > >The en passant square is e3. If you did a large search from this position, and >then encountered it again without the ep square set, then you won't find it in >your transposition table, even though the en passant square being set has >nothing to do with the score of this position. If you didn't hash the ep square, >you would get that large search again here for free. Maybe this is something >that partition search addresses. I'm not sure. Something you may not have thought about. Why is e3 the en-passant square in the position that you posted? There is no en-passant capture legal there, so I think it is silly to record it as being an en-passant square. When an en-passant capture is actually legal, it is important to record this fact in the hash, since the ep-capture might be the best move in that position, but illegal in a position which differed only in the ep-legality. Angrim
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