diff -r 564af8a16828 -r 611332453da0 src/chess/rules.h
--- a/src/chess/rules.h	Tue Aug 28 15:56:33 2018 +0200
+++ b/src/chess/rules.h	Wed Aug 29 13:45:13 2018 +0200
@@ -112,6 +112,7 @@
     Board board;
     MoveList* movelist;
     MoveList* lastmove;
+    unsigned int movecount; /* number of (half-)moves (counting BOTH colors) */
     _Bool checkmate;
     _Bool stalemate;
     _Bool remis;