Revert "Simplify Away Quadruple Extensions"

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 official-stockfish#5265 bench 1404295 Co-Authored-By: Michael Chaly <[email protected]>
locutus2 · May 19, 2024 · 2d32581 · 2d32581
1 parent 99f1bac
commit 2d32581
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/src/search.cpp b/src/search.cpp
@@ -1053,9 +1053,11 @@ Value Search::Worker::search(
                     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));
                 }