Give bonus for rooks that are alligned with enemy kingring

[stockfish] / src / evaluate.cpp

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 2d1f4b9e9e1f0fb2a507a2b9e5d48eeb17a11900..8e8cc0912e57ddd4e37c12cb579631eaee9de289 100644 (file)
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -99,7 +99,7 @@ namespace {
     { S(-60,-78), S(-20,-17), S(  2, 23), S(  3, 39), S(  3, 70), S( 11, 99), // Rook
       S( 22,103), S( 31,121), S( 40,134), S( 40,139), S( 41,158), S( 48,164),
       S( 57,168), S( 57,169), S( 62,172) },
-    { S(-34,-36), S(-15,-21), S(-10, -1), S(-10, 22), S( 20, 41), S( 23, 56), // Queen
+    { S(-30,-48), S(-12,-30), S( -8, -7), S( -9, 19), S( 20, 40), S( 23, 55), // Queen
       S( 23, 59), S( 35, 75), S( 38, 78), S( 53, 96), S( 64, 96), S( 65,100),
       S( 65,121), S( 66,127), S( 67,131), S( 67,133), S( 72,136), S( 72,141),
       S( 77,147), S( 79,150), S( 93,151), S(108,168), S(108,168), S(108,171),
@@ -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]);