Simplify SMP Reduction

xu-shawn · vondele · commit f2da0ccf3f82 · 2025-09-02T20:41:08.000+02:00
Passed Non-regression SMP STC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 232784 W: 59845 L: 59841 D: 113098 Ptnml(0-2): 289, 26459, 62934, 26379, 331 https://tests.stockfishchess.org/tests/view/68ab96bf75da51a345a5acd6 Passed Non-regression SMP LTC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 374270 W: 95978 L: 96113 D: 182179 Ptnml(0-2): 118, 38575, 109888, 38432, 122 https://tests.stockfishchess.org/tests/view/68abcf1c75da51a345a5adb6 closes #6285 Bench: 2667107
diff --git a/src/search.cpp b/src/search.cpp
@@ -1167,8 +1167,7 @@ Value Search::Worker::search(
 
         // These reduction adjustments have no proven non-linear scaling
 
-        r += 671;  // Base reduction offset to compensate for other tweaks
-        r -= (threadIdx % 8) * 64;
+        r += 543;  // Base reduction offset to compensate for other tweaks
         r -= moveCount * 66;
         r -= std::abs(correctionValue) / 30450;
 
