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Set captureThreshold according to static evaluation

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Consider negative captures as good if
still enough to reach beta.

After 7502 games:
Mod vs Orig 1225 - 1158 - 5119 ELO +3 (+- 4.5)

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2011-12-08 13:48:18 +01:00
parent da6e53a436
commit 6e05055f06
1 changed files with 5 additions and 2 deletions
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7
src/movepick.cpp
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@@ -88,11 +88,14 @@ MovePicker::MovePicker(const Position& p, Move ttm, Depth d, const History& h,
killers[0].move = ss->killers[0]; killers[0].move = ss->killers[0];
killers[1].move = ss->killers[1]; killers[1].move = ss->killers[1];
// Consider sligtly negative captures as good if at low // Consider sligtly negative captures as good if at low depth and far from beta
// depth and far from beta.
if (ss && ss->eval < beta - PawnValueMidgame && d < 3 * ONE_PLY) if (ss && ss->eval < beta - PawnValueMidgame && d < 3 * ONE_PLY)
captureThreshold = -PawnValueMidgame; captureThreshold = -PawnValueMidgame;
// Consider negative captures as good if still enough to reach beta
else if (ss && ss->eval > beta)
captureThreshold = beta - ss->eval;
phasePtr = MainSearchTable; phasePtr = MainSearchTable;
} }