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Code Issues Releases Wiki Activity

Revert "Simplify Away Quadruple Extensions"

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This reverts commit 4edd1a3

The unusual result of (combined) +12.0 +- 3.7 in the 2 VVLTC simplification SPRTs ran was the result of base having only 64MB of hash instead of 512MB (Asymmetric hash).
Vizvezdenec was the one to notice this.

closes https://github.com/official-stockfish/Stockfish/pull/5265

bench 1404295

Co-Authored-By: Michael Chaly <26898827+Vizvezdenec@users.noreply.github.com>
This commit is contained in:
Viren6 2024-05-19 01:40:29 +01:00 • committed by Joost VandeVondele
parent 99f1bacfd6
commit 2d32581623
1 changed files with 3 additions and 1 deletions
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4
src/search.cpp
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@ -1053,9 +1053,11 @@ moves_loop: // When in check, search starts here
int doubleMargin = 298 * PvNode - 209 * !ttCapture;
int tripleMargin =
117 + 252 * PvNode - 270 * !ttCapture + 111 * (ss->ttPv || !ttCapture);
int quadMargin = 471 + 343 * PvNode - 281 * !ttCapture + 217 * ss->ttPv;
extension = 1 + (value < singularBeta - doubleMargin)
+ (value < singularBeta - tripleMargin);
+ (value < singularBeta - tripleMargin)
+ (value < singularBeta - quadMargin);
depth += ((!PvNode) && (depth < 15));
}