Author: Dave Gomboc
Date: 21:02:19 10/19/00
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On October 19, 2000 at 09:33:48, Robert Hyatt wrote: >On October 19, 2000 at 05:57:30, Pham Minh Tri wrote: > >>I see some chess programs retrieve information based on color (side to move), >>this means only half of hash table is useful. I wonder if we could retrieve >>useful data from opponent part of hash table (I think when we implement Alpha >>Beta function, it is easy to convert information between two sides). >> >>Pham > >The problem is that in many positions, side to move is critical. And it would >be wrong should you do what you suggest. > >In endings it would be fatal. I think he means everything, e.g. rotating the board 180 degees and flipping the colours of all the pieces. Essentially, always hash the position from the perspective of the side to move, and assume that they are player A. Sounds costly. Dave
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