diff -r 08d7a6e3ec31 -r 84880c7e1ea6 src/game.h
--- a/src/game.h	Sat Mar 22 18:56:52 2014 +0100
+++ b/src/game.h	Wed Mar 26 13:16:49 2014 +0100
@@ -76,6 +76,8 @@
     _Bool capture;
 } Move;
 
+#define POS_UNSPECIFIED UINT8_MAX
+
 #define isfile(file) (file >= 'a' && file <= 'h')
 #define isrow(row) (row >= '1' && row <= '8')
 #define rowidx(row) (row-'1')