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Revert "Double Impact of Gain tables"

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This reverts commit 36c82b751c

Seems a regression against 2.3.1 tested with 20K games at 60"+0.05

With patch applied
ELO: 15.44 +-2.8 (95%) LOS: 100.0%
Total: 20000 W: 3928 L: 3040 D: 13032

Without patch applied
ELO: 18.76 +-2.8 (95%) LOS: 100.0%
Total: 20000 W: 3903 L: 2824 D: 13273

bench: 4781239
This commit is contained in:
Marco Costalba 2013-04-05 08:56:22 +02:00
parent 6e2371a86b
commit 8c10029df1
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@ -876,7 +876,7 @@ split_point_start: // At split points actual search starts from here
// but fixing this made program slightly weaker.
Depth predictedDepth = newDepth - reduction<PvNode>(depth, moveCount);
futilityValue = ss->staticEval + ss->evalMargin + futility_margin(predictedDepth, moveCount)
+ 2 * Gain[pos.piece_moved(move)][to_sq(move)];
+ Gain[pos.piece_moved(move)][to_sq(move)];
if (futilityValue < beta)
{