X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=src%2Fposition.h;h=078ff5b79f23e9e2d85b943734f2c4713bbbb3bd;hb=02ef1f4496965b5ad8c26ac6bc18245eaffae2ea;hp=510875d86d3ca4e0e1d38687cf926f9a7295b315;hpb=15ac117ac492e3147b391aa0ee3665fe8876be63;p=stockfish

diff --git a/src/position.h b/src/position.h
index 510875d8..078ff5b7 100644
--- a/src/position.h
+++ b/src/position.h
@@ -185,6 +185,8 @@ private:
   void move_piece(Square from, Square to);
   template<bool Do>
   void do_castling(Color us, Square from, Square& to, Square& rfrom, Square& rto);
+  template<bool AfterMove>
+  Key adjust_key50(Key k) const;
 
   // Data members
   Piece board[SQUARE_NB];
@@ -327,8 +329,14 @@ inline int Position::pawns_on_same_color_squares(Color c, Square s) const {
 }
 
 inline Key Position::key() const {
-  return st->rule50 < 14 ? st->key
-                         : st->key ^ make_key((st->rule50 - 14) / 8);
+  return adjust_key50<false>(st->key);
+}
+
+template<bool AfterMove>
+inline Key Position::adjust_key50(Key k) const
+{
+  return st->rule50 < 14 - AfterMove
+      ? k : k ^ make_key((st->rule50 - (14 - AfterMove)) / 8);
 }
 
 inline Key Position::pawn_key() const {