Make kingRing always 8 squares

[stockfish] / src / evaluate.cpp

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 48c6e8ea1d7befaee0235485fcd07a4a28b5c412..c50d14c21aac50605e6a58d87fddbe83d49e285f 100644 (file)
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -275,6 +275,12 @@ namespace {
         if (relative_rank(Us, pos.square<KING>(Us)) == RANK_1)
             kingRing[Us] |= shift<Up>(kingRing[Us]);
 
         if (relative_rank(Us, pos.square<KING>(Us)) == RANK_1)
             kingRing[Us] |= shift<Up>(kingRing[Us]);
 

+        if (file_of(pos.square<KING>(Us)) == FILE_H)
+            kingRing[Us] |= shift<WEST>(kingRing[Us]);
+
+        else if (file_of(pos.square<KING>(Us)) == FILE_A)
+            kingRing[Us] |= shift<EAST>(kingRing[Us]);
+

         kingAttackersCount[Them] = popcount(attackedBy[Us][KING] & pe->pawn_attacks(Them));
         kingAttacksCount[Them] = kingAttackersWeight[Them] = 0;
     }
         kingAttackersCount[Them] = popcount(attackedBy[Us][KING] & pe->pawn_attacks(Them));
         kingAttacksCount[Them] = kingAttackersWeight[Them] = 0;
     }