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Introduce Correction History Quad Extensions

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Also modifies the double and triple extension margins with the correction history adjustment.

STC Elo Estimate:
Elo: -4.40 ± 1.4 (95%) LOS: 0.0%
Total: 60000 W: 15230 L: 15990 D: 28780
Ptnml(0-2): 264, 7495, 15168, 6883, 190
nElo: -8.48 ± 2.8 (95%) PairsRatio: 0.91
https://tests.stockfishchess.org/tests/view/6783a3786ddf09c0b4b703a1

Passed 1st VVLTC:
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 35736 W: 9354 L: 9088 D: 17294
Ptnml(0-2): 4, 3191, 11212, 3457, 4
https://tests.stockfishchess.org/tests/view/6783a3336ddf09c0b4b7039b

Passed 2nd VVLTC:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 36394 W: 9515 L: 9225 D: 17654
Ptnml(0-2): 1, 3271, 11364, 3559, 2
https://tests.stockfishchess.org/tests/view/678395e26ddf09c0b4b70345

closes https://github.com/official-stockfish/Stockfish/pull/5767

Bench: 1567166
This commit is contained in:
Viren6
2025-01-12 13:00:45 +00:00
committed by Disservin
parent 93edf7a74c
commit e2612f9a29
1 changed files with 8 additions and 3 deletions
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src/search.cpp
+8 -3
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@@ -1070,11 +1070,16 @@ moves_loop: // When in check, search starts here
if (value < singularBeta)
{
int doubleMargin = 259 * PvNode - 194 * !ttCapture;
int tripleMargin = 90 + 266 * PvNode - 272 * !ttCapture + 107 * ss->ttPv;
int corrValAdj = std::abs(correctionValue) / 262144;
int doubleMargin = 249 * PvNode - 194 * !ttCapture - corrValAdj;
int tripleMargin =
94 + 287 * PvNode - 249 * !ttCapture + 99 * ss->ttPv - corrValAdj;
int quadMargin =
394 + 287 * PvNode - 249 * !ttCapture + 99 * ss->ttPv - corrValAdj;
extension = 1 + (value < singularBeta - doubleMargin)
+ (value < singularBeta - tripleMargin);
+ (value < singularBeta - tripleMargin)
+ (value < singularBeta - quadMargin);
depth += ((!PvNode) && (depth < 15));
}