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Simplify Stat Score bonus
This is a functional simplification of this statScore bonus. There seems to be little risk of regression with this one. STC LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 26829 W: 5892 L: 5781 D: 15156 http://tests.stockfishchess.org/tests/view/5c5086bb0ebc593af5d4db75 LTC LLR: 2.96 (-2.94,2.94) [-3.00,1.00] Total: 28232 W: 4684 L: 4575 D: 18973 http://tests.stockfishchess.org/tests/view/5c50d7690ebc593af5d4dec9 Closes https://github.com/official-stockfish/Stockfish/pull/1979 Bench: 4001014
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1 changed files with 1 additions and 3 deletions
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@ -747,9 +747,7 @@ namespace {
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{
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if ((ss-1)->currentMove != MOVE_NULL)
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{
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int p = (ss-1)->statScore;
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int bonus = p > 0 ? (-p - 2500) / 512 :
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p < 0 ? (-p + 2500) / 512 : 0;
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int bonus = -(ss-1)->statScore / 512;
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pureStaticEval = evaluate(pos);
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ss->staticEval = eval = pureStaticEval + bonus;
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