Combination of two ideas:

[stockfish] / src / movepick.cpp

diff --git a/src/movepick.cpp b/src/movepick.cpp
index 3d44721b687059b9f8a284759112f7299732a0f4..7cf3e60723206324a1ec24b8b886c1b8b4d60bba 100644 (file)
--- a/src/movepick.cpp
+++ b/src/movepick.cpp
@@ -146,7 +146,7 @@ void MovePicker::score<QUIETS>() {
 
   for (auto& m : *this)
       m.value =  history[pos.moved_piece(m)][to_sq(m)]
-               + cmh[pos.moved_piece(m)][to_sq(m)] * 3;
+               + cmh[pos.moved_piece(m)][to_sq(m)];
 }
 
 template<>