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Tweak Correction History Bonus Asymmetrically

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Refine the correction history update by applying an asymmetric bonus based on the type of evaluation error. It differentiates between negative corrections and positive corrections.

Passed STC:
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 165184 W: 43314 L: 42807 D: 79063
Ptnml(0-2): 551, 19391, 42261, 19778, 611
https://tests.stockfishchess.org/tests/view/68cae49902c43c969fe7f008

Passed LTC:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 243234 W: 62765 L: 62029 D: 118440
Ptnml(0-2): 163, 25996, 68551, 26756, 151
https://tests.stockfishchess.org/tests/view/68d1c50dfa806e2e8393aa1f

closes https://github.com/official-stockfish/Stockfish/pull/6338

Bench: 2746404
This commit is contained in:
FauziAkram
2025-10-05 09:25:44 +02:00
committed by Joost VandeVondele
parent 5c93616a3f
commit 7a7c033a86
1 changed files with 5 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/search.cpp
+5 -3
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@@ -1449,9 +1449,11 @@ moves_loop: // When in check, search starts here
&& ((bestValue < ss->staticEval && bestValue < beta) // negative correction & no fail high
|| (bestValue > ss->staticEval && bestMove))) // positive correction & no fail low
{
auto bonus = std::clamp(int(bestValue - ss->staticEval) * depth / 8,
-CORRECTION_HISTORY_LIMIT / 4, CORRECTION_HISTORY_LIMIT / 4);
update_correction_history(pos, ss, *this, bonus);
auto bonus =
std::clamp(int(bestValue - ss->staticEval) * depth / (8 + (bestValue > ss->staticEval)),
-CORRECTION_HISTORY_LIMIT / 4, CORRECTION_HISTORY_LIMIT / 4);
update_correction_history(pos, ss, *this,
(1088 - 180 * (bestValue > ss->staticEval)) * bonus / 1024);
}
assert(bestValue > -VALUE_INFINITE && bestValue < VALUE_INFINITE);