Tweak KingFlank when king is on edge files

[stockfish] / src / evaluate.cpp

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 31419146667d95918d2a14ff311c2214763fb29f..d552bd6ddd5867d656f1a34ef4347c29779f9a7a 100644 (file)
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -79,9 +79,9 @@ namespace {
   constexpr Bitboard Center      = (FileDBB | FileEBB) & (Rank4BB | Rank5BB);
 
   constexpr Bitboard KingFlank[FILE_NB] = {
-    QueenSide,   QueenSide, QueenSide,
+    QueenSide ^ FileDBB, QueenSide, QueenSide,
     CenterFiles, CenterFiles,
-    KingSide,    KingSide,  KingSide
+    KingSide, KingSide, KingSide ^ FileEBB
   };
 
   // Threshold for lazy and space evaluation