X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fevaluate.cpp;h=8e8cc0912e57ddd4e37c12cb579631eaee9de289;hp=7aa67f26db6c4d0a2f916f97a822d2efb6a812fe;hb=d40d04c17ceadff6f15d1cb1d4d469f823a35a02;hpb=7f2c8a2b81af19033a62845408b7ae19ed513053

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 7aa67f26..8e8cc091 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -143,6 +143,7 @@ namespace {
   constexpr Score PassedFile          = S( 11,  8);
   constexpr Score PawnlessFlank       = S( 17, 95);
   constexpr Score RestrictedPiece     = S(  7,  7);
+  constexpr Score RookOnKingRing      = S( 16,  0);
   constexpr Score RookOnQueenFile     = S(  5,  9);
   constexpr Score SliderOnQueen       = S( 59, 18);
   constexpr Score ThreatByKing        = S( 24, 89);
@@ -287,6 +288,8 @@ namespace {
             kingAttackersWeight[Us] += KingAttackWeights[Pt];
             kingAttacksCount[Us] += popcount(b & attackedBy[Them][KING]);
         }
+        else if (Pt == ROOK && (file_bb(s) & kingRing[Them]))
+            score += RookOnKingRing;
 
         int mob = popcount(b & mobilityArea[Us]);