diff -r 9962f5d98764 -r bde99d803caf src/chess/king.h
--- a/src/chess/king.h	Thu Aug 06 14:45:55 2026 +0200
+++ b/src/chess/king.h	Thu Aug 06 16:11:37 2026 +0200
@@ -41,9 +41,10 @@
 bool king_isblocked(const GameState *gamestate, const Move *move);
 
 #define KING_MOVES_MAX 8
-size_t king_moves(GameState *gamestate, Color c, Row r, File f, Move *moves);
+size_t king_moves(const GameState *gamestate,
+        Color c, Row r, File f, Move *moves);
 #define king_moves_allowed(gamestate, color, row, file, moves) \
-    filter_moves_allowed(gamestate, color, row, file, moves, king_moves)
+        filter_moves_allowed(gamestate, color, row, file, moves, king_moves)
 
 #ifdef	__cplusplus
 }