verify if quad extensions actually gain

bench 1497842
official-stockfish · May 18, 2024 · 9c33d8a · 9c33d8a
1 parent 4759764
commit 9c33d8a
Showing 1 changed file with 1 addition and 3 deletions.
diff --git a/src/search.cpp b/src/search.cpp
@@ -1053,11 +1053,9 @@ Value Search::Worker::search(
                     int doubleMargin = 285 * PvNode - 228 * !ttCapture;
                     int tripleMargin =
                       121 + 238 * PvNode - 259 * !ttCapture + 117 * (ss->ttPv || !ttCapture);
-                    int quadMargin = 471 + 343 * PvNode - 281 * !ttCapture + 217 * ss->ttPv;
 
                     extension = 1 + (value < singularBeta - doubleMargin)
-                              + (value < singularBeta - tripleMargin)
-                              + (value < singularBeta - quadMargin);
+                              + (value < singularBeta - tripleMargin);
 
                     depth += ((!PvNode) && (depth < 14));
                 }