Simplify multiplier for improvement

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index c7b00766553e96f72db634d105724453090ed4bf..593fdc722e0b13a2a1c3d3b8c6087e9b5e613612 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -779,7 +779,7 @@ namespace {
         && (ss-1)->statScore < 17329
         &&  eval >= beta
         &&  eval >= ss->staticEval
-        &&  ss->staticEval >= beta - 21 * depth - improvement * 99 / 1300 + 258
+        &&  ss->staticEval >= beta - 21 * depth - improvement / 13 + 258
         && !excludedMove
         &&  pos.non_pawn_material(us)
         && (ss->ply >= thisThread->nmpMinPly))