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Use TT refined value to stand pat

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Passed both short TC:
LLR: 2.95 (-2.94,2.94) [-1.50,4.50]
Total: 17811 W: 3520 L: 3366 D: 10925

And long TC:
LLR: 2.95 (-2.94,2.94) [0.00,6.00]
Total: 30255 W: 5070 L: 4825 D: 20360

bench: 8340585
This commit is contained in:
Lucas Braesch 2013-10-07 09:10:48 +02:00 • committed by Marco Costalba
parent a0cc15ccbc
commit 984ee9d05b
1 changed files with 6 additions and 1 deletions
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7
src/search.cpp
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@ -1188,6 +1188,11 @@ moves_loop: // When in check and at SpNode search starts from here
if ( (ss->staticEval = bestValue = tte->eval_value()) == VALUE_NONE if ( (ss->staticEval = bestValue = tte->eval_value()) == VALUE_NONE
||(ss->evalMargin = tte->eval_margin()) == VALUE_NONE) ||(ss->evalMargin = tte->eval_margin()) == VALUE_NONE)
ss->staticEval = bestValue = evaluate(pos, ss->evalMargin); ss->staticEval = bestValue = evaluate(pos, ss->evalMargin);
// Can ttValue be used as a better position evaluation?
if (ttValue != VALUE_NONE)
if (tte->bound() & (ttValue > bestValue ? BOUND_LOWER : BOUND_UPPER))
bestValue = ttValue;
} }
else else
ss->staticEval = bestValue = evaluate(pos, ss->evalMargin); ss->staticEval = bestValue = evaluate(pos, ss->evalMargin);
@ -1205,7 +1210,7 @@ moves_loop: // When in check and at SpNode search starts from here
if (PvNode && bestValue > alpha) if (PvNode && bestValue > alpha)
alpha = bestValue; alpha = bestValue;
futilityBase = ss->staticEval + ss->evalMargin + Value(128); futilityBase = bestValue + ss->evalMargin + Value(128);
} }
// Initialize a MovePicker object for the current position, and prepare // Initialize a MovePicker object for the current position, and prepare