Simplify null move search condition

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index b30af89f1317da0307b38b1f66c10ff2e6bd32bb..65e496b88ab66fd29ee5da329597343ccc92f114 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -825,7 +825,7 @@ namespace {
         && (ss-1)->statScore < 23767
         &&  eval >= beta
         &&  eval >= ss->staticEval
-        &&  ss->staticEval >= beta - 20 * depth - improvement / 15 + 168 * ss->ttPv + 177
+        &&  ss->staticEval >= beta - 20 * depth - improvement / 15 + 177
         && !excludedMove
         &&  pos.non_pawn_material(us)
         && (ss->ply >= thisThread->nmpMinPly || us != thisThread->nmpColor))