X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=src%2Fevaluate.cpp;h=ac9cf90bdcb314aad1198af283f0ab8d9662eb6c;hb=a4eda3056ef7f6f69ae15925255621cb32443de9;hp=95729e4aade6bea4d01a3fe776116aa91cc37c3d;hpb=0365b086017da2f5b0aeae6e396a213b56673c72;p=stockfish

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 95729e4a..ac9cf90b 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -164,7 +164,7 @@ namespace {
   constexpr Score KnightOnQueen      = S( 21, 11);
   constexpr Score LongDiagonalBishop = S( 22,  0);
   constexpr Score MinorBehindPawn    = S( 16,  0);
-  constexpr Score Overload           = S( 16,  7);
+  constexpr Score Overload           = S( 13,  6);
   constexpr Score PawnlessFlank      = S( 20, 80);
   constexpr Score RookOnPawn         = S(  8, 24);
   constexpr Score SliderOnQueen      = S( 42, 21);
@@ -540,24 +540,29 @@ 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 = (pos.pieces(Them, QUEEN) | weak) & attackedBy[Us][ROOK];
+        b = weak & attackedBy[Us][ROOK];
         while (b)
         {
             Square s = pop_lsb(&b);
             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;
         }
 
-        // Bonus for king attacks on pawns or pieces which are not pawn-defended
         if (weak & attackedBy[Us][KING])
             score += ThreatByKing;
 
         score += Hanging * popcount(weak & ~attackedBy[Them][ALL_PIECES]);
 
-        b =  weak & nonPawnEnemies & attackedBy[Them][ALL_PIECES];
+        b = weak & nonPawnEnemies & attackedBy[Them][ALL_PIECES];
         score += Overload * popcount(b);
     }
 
@@ -576,7 +581,7 @@ namespace {
     b  = shift<Up>(pos.pieces(Us, PAWN)) & ~pos.pieces();
     b |= shift<Up>(b & TRank3BB) & ~pos.pieces();
 
-    // Keep only the squares which are not completely unsafe
+    // Keep only the squares which are relatively safe
     b &= ~attackedBy[Them][PAWN]
         & (attackedBy[Us][ALL_PIECES] | ~attackedBy[Them][ALL_PIECES]);