X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=src%2Fevaluate.cpp;h=31419146667d95918d2a14ff311c2214763fb29f;hb=c9f80660a6c529f6909c1beed4e9d5798979711b;hp=7309f9f31a6c5e7c7de25bdaac4e75394f9f9f57;hpb=ae9892788526a3809f490bbc20d85d458b987da3;p=stockfish

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 7309f9f3..31419146 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -513,7 +513,7 @@ namespace {
     constexpr Direction Up       = (Us == WHITE ? NORTH   : SOUTH);
     constexpr Bitboard  TRank3BB = (Us == WHITE ? Rank3BB : Rank6BB);
 
-    Bitboard b, weak, defended, nonPawnEnemies, stronglyProtected, safeThreats;
+    Bitboard b, weak, defended, nonPawnEnemies, stronglyProtected, safe;
     Score score = SCORE_ZERO;
 
     // Non-pawn enemies
@@ -530,6 +530,9 @@ namespace {
     // Enemies not strongly protected and under our attack
     weak = pos.pieces(Them) & ~stronglyProtected & attackedBy[Us][ALL_PIECES];
 
+    // Safe or protected squares
+    safe = ~attackedBy[Them][ALL_PIECES] | attackedBy[Us][ALL_PIECES];
+
     // Bonus according to the kind of attacking pieces
     if (defended | weak)
     {
@@ -540,6 +543,9 @@ 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 +555,9 @@ 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])
@@ -564,42 +573,37 @@ namespace {
     if (pos.pieces(Us, ROOK, QUEEN))
         score += WeakUnopposedPawn * pe->weak_unopposed(Them);
 
-    // Our safe or protected pawns
-    b =   pos.pieces(Us, PAWN)
-       & (~attackedBy[Them][ALL_PIECES] | attackedBy[Us][ALL_PIECES]);
-
-    safeThreats = pawn_attacks_bb<Us>(b) & nonPawnEnemies;
-    score += ThreatBySafePawn * popcount(safeThreats);
-
     // 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();
 
     // Keep only the squares which are relatively safe
-    b &= ~attackedBy[Them][PAWN]
-        & (attackedBy[Us][ALL_PIECES] | ~attackedBy[Them][ALL_PIECES]);
+    b &= ~attackedBy[Them][PAWN] & safe;
 
     // Bonus for safe pawn threats on the next move
-    b =   pawn_attacks_bb<Us>(b)
-       &  pos.pieces(Them)
-       & ~attackedBy[Us][PAWN];
-
+    b = pawn_attacks_bb<Us>(b) & pos.pieces(Them);
     score += ThreatByPawnPush * popcount(b);
 
+    // Our safe or protected pawns
+    b = pos.pieces(Us, PAWN) & safe;
+
+    b = pawn_attacks_bb<Us>(b) & nonPawnEnemies;
+    score += ThreatBySafePawn * popcount(b);
+
     // Bonus for threats on the next moves against enemy queen
     if (pos.count<QUEEN>(Them) == 1)
     {
         Square s = pos.square<QUEEN>(Them);
-        safeThreats = mobilityArea[Us] & ~stronglyProtected;
+        safe = mobilityArea[Us] & ~stronglyProtected;
 
         b = attackedBy[Us][KNIGHT] & pos.attacks_from<KNIGHT>(s);
 
-        score += KnightOnQueen * popcount(b & safeThreats);
+        score += KnightOnQueen * popcount(b & safe);
 
         b =  (attackedBy[Us][BISHOP] & pos.attacks_from<BISHOP>(s))
            | (attackedBy[Us][ROOK  ] & pos.attacks_from<ROOK  >(s));
 
-        score += SliderOnQueen * popcount(b & safeThreats & attackedBy2[Us]);
+        score += SliderOnQueen * popcount(b & safe & attackedBy2[Us]);
     }
 
     if (T)