Rank threats on pinned pawns
[stockfish] / src / evaluate.cpp
index 7309f9f..ac9cf90 100644 (file)
@@ -540,6 +540,9 @@ namespace {
             score += ThreatByMinor[type_of(pos.piece_on(s))];
             if (type_of(pos.piece_on(s)) != PAWN)
                 score += ThreatByRank * (int)relative_rank(Them, s);
+
+            else if (pos.blockers_for_king(Them) & s)
+                score += ThreatByRank * (int)relative_rank(Them, s) / 2;
         }
 
         b = weak & attackedBy[Us][ROOK];
@@ -549,6 +552,9 @@ namespace {
             score += ThreatByRook[type_of(pos.piece_on(s))];
             if (type_of(pos.piece_on(s)) != PAWN)
                 score += ThreatByRank * (int)relative_rank(Them, s);
+
+            else if (pos.blockers_for_king(Them) & s)
+                score += ThreatByRank * (int)relative_rank(Them, s) / 2;
         }
 
         if (weak & attackedBy[Us][KING])