diff -r fd1eb081de40 -r 2e5846019b4f src/chess/rules.c
--- a/src/chess/rules.c	Mon Mar 31 11:41:08 2014 +0200
+++ b/src/chess/rules.c	Mon Mar 31 14:00:58 2014 +0200
@@ -127,6 +127,11 @@
         return 0;
     }
     
+    /* must move */
+    if (move->fromfile == move->tofile && move->fromrow == move->torow) {
+        return 0;
+    }
+    
     /* does piece exist */
     result = msrc(board, move) == move->piece;