Author: Matthew White
Date: 15:53:01 03/13/03
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On March 13, 2003 at 14:57:32, Albert Bertilsson wrote: >Now I've done some testing with smaller values... > >Using these constants increases the nodes searched by 5% >#define DOUBLED_PAWNS -1 >#define PAWN_NOT_ISOLATED 1 >#define BOTH_BISHOPS 1 >#define ROOK_HALF_OPEN_RANK 1 >#define PAWN_CLOSE_TO_KING 1 >#define QUEEN_CLOSE_TO_OKING 1 >#define KNIGHT_CLOSE_TO_OKING 1 > >Using these constants increases the nodes searched by 30% >#define DOUBLED_PAWNS -5 >#define PAWN_NOT_ISOLATED 4 >#define BOTH_BISHOPS 10 >#define ROOK_HALF_OPEN_RANK 4 >#define PAWN_CLOSE_TO_KING 3 >#define QUEEN_CLOSE_TO_OKING 4 >#define KNIGHT_CLOSE_TO_OKING 5 > >Obviously anything I do makes the node count go up, and the basic questing >remains, isn't that wrong? > >Or is the problem that I've only done very little evaluation and that this is to >little and this "confuses" the engine? > >/regards Albert One reason that you will get more searches with this type of knowledge is that your eval will show ANY rook move to a half-open file as good. It will cause the search to evaluate more rook moves, as those positions without material difference will now be searched deeper. Matt
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