update Null Move Pruning parameters

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index e5d18f776f176b04d476852904ca774c401185ce..9cdc7046ef764bba82ed87ccecccdb091aa3a128 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -827,7 +827,7 @@ namespace {
         && (ss-1)->statScore < 23824
         &&  eval >= beta
         &&  eval >= ss->staticEval
-        &&  ss->staticEval >= beta - 33 * depth - 33 * improving + 112 * ttPv + 311
+        &&  ss->staticEval >= beta - 28 * depth - 28 * improving + 94 * ttPv + 200
         && !excludedMove
         &&  pos.non_pawn_material(us)
         && (ss->ply >= thisThread->nmpMinPly || us != thisThread->nmpColor))