Simplify WeakUnopposedPawn #2181

[stockfish] / src / evaluate.cpp

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 30c22a8e65b340103fda85698f31d91e55dfcc97..0da6ba4ddfa2c4b91e4387a999181d2a949ebef5 100644 (file)
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -152,7 +152,6 @@ namespace {
   constexpr Score ThreatBySafePawn   = S(173, 94);
   constexpr Score TrappedRook        = S( 47,  4);
   constexpr Score WeakQueen          = S( 49, 15);
-  constexpr Score WeakUnopposedPawn  = S( 12, 23);
 
 #undef S
 
@@ -555,10 +554,6 @@ namespace {
 
     score += RestrictedPiece * popcount(b);
 
-    // Bonus for enemy unopposed weak pawns
-    if (pos.pieces(Us, ROOK, QUEEN))
-        score += WeakUnopposedPawn * pe->weak_unopposed(Them);
-
     // Find squares where our pawns can push on the next move
     b  = shift<Up>(pos.pieces(Us, PAWN)) & ~pos.pieces();
     b |= shift<Up>(b & TRank3BB) & ~pos.pieces();