Author: Ross Boyd
Date: 15:57:22 05/22/05
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On May 22, 2005 at 15:10:37, William Bryant wrote: >My eval has 4 components: >Material >King Safety >Pawn >Piece Position Score. > >Does everything except the Material go into the calculation of greatest >positional score (for delta pruning int he Q search), or just the material and >or the pawn values. > >William Everything except material. Basically, with delta pruning you are pruning moves that don't have a hope of reaching alpha - even after a full positional evaluation and taking into account potential capture/promotion values. So, you keep track of the highest positional score the search has achieved and use that as the 'margin' for error. You might add other conditions to delta pruning, eg. avoid delta pruning of tactical moves or check evasions or if there are mate threats. Ross
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