X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fevaluate.cpp;h=8c84ac299777e7ff7a33f91cb2f9e439de783686;hp=99e9f0475281111fff761ad0f4f0b0f33e7e3968;hb=af0c13ba6ad5d51432a8f4531d53c7309484df6b;hpb=c7cf45241cd264104c02a4e717c447f5231a284a;ds=sidebyside

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 99e9f047..8c84ac29 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -204,6 +204,8 @@ namespace {
   const int BishopCheck       = 2;
   const int KnightCheck       = 3;
 
+  const int UnsupportedPinnedPiece = 2;
+
   // KingDanger[Color][attackUnits] contains the actual king danger weighted
   // scores, indexed by color and by a calculated integer number.
   Score KingDanger[COLOR_NB][128];
@@ -693,6 +695,10 @@ Value do_evaluate(const Position& pos) {
         if (b)
             attackUnits += KnightCheck * popcount<Max15>(b);
 
+        // Penalty for pinned pieces not defended by a pawn
+        if (ei.pinnedPieces[Us] & ~ei.attackedBy[Us][PAWN])
+            attackUnits += UnsupportedPinnedPiece;
+
         // To index KingDanger[] attackUnits must be in [0, 99] range
         attackUnits = std::min(99, std::max(0, attackUnits));