--- a/src/chess/knight.h	Tue Jun 03 08:43:17 2025 +0200
+++ b/src/chess/knight.h	Wed Jun 04 23:56:40 2025 +0200
@@ -36,8 +36,8 @@
 extern "C" {
 #endif
 
-_Bool knight_chkrules(Move *move);
-#define knight_isblocked(gs,m) 0
+bool knight_chkrules(Move *move);
+#define knight_isblocked(gs,m) false
 
 #ifdef	__cplusplus
 }