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Scale down stat bonus
STC https://tests.stockfishchess.org/tests/view/652eff58de6d262d08d33353 LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 88224 W: 22618 L: 22228 D: 43378 Ptnml(0-2): 282, 10177, 22783, 10609, 261 LTC https://tests.stockfishchess.org/tests/view/652fd13bde6d262d08d3481a LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 143508 W: 36674 L: 36142 D: 70692 Ptnml(0-2): 92, 15240, 40534, 15820, 68 Reduces the stat bonus by 20%. Maybe future patches can tune the actual bonus calculations for different histories. closes https://github.com/official-stockfish/Stockfish/pull/4836 bench: 1185932
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@ -51,7 +51,7 @@ public:
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assert(abs(bonus) <= D); // Ensure range is [-D, D]
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static_assert(D <= std::numeric_limits<T>::max(), "D overflows T");
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entry += bonus - entry * abs(bonus) / D;
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entry += (bonus * D - entry * abs(bonus)) / (D * 5 / 4);
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assert(abs(entry) <= D);
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}
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