diff -r 7ffd66591afe -r a298c6637c30 src/rules/pawn.c
--- a/src/rules/pawn.c	Fri Mar 28 11:45:01 2014 +0100
+++ b/src/rules/pawn.c	Fri Mar 28 14:32:52 2014 +0100
@@ -28,6 +28,7 @@
  */
 
 #include "pawn.h"
+#include "rules.h"
 
 _Bool pawn_chkrules(Board board, Move *move) {
     int8_t d = ((move->piece & COLOR_MASK) == WHITE ? -1 : 1);
@@ -56,7 +57,7 @@
     return mdst(board,move) && !move->capture;
 }
 
-_Bool pawn_getlocation(Board board, Move *move) {
+int pawn_getlocation(Board board, Move *move) {
     int8_t d = ((move->piece & COLOR_MASK) == WHITE ? -1 : 1);
     
     if (move->fromfile == POS_UNSPECIFIED) {
@@ -64,7 +65,7 @@
     }
     move->fromrow = move->torow + d;
     if (move->fromrow > 6) {
-        return FALSE;
+        return INVALID_POSITION;
     } else {
         /* advanced first move */
         if (move->fromrow == (d < 0 ? 2 : 5) &&
@@ -72,9 +73,9 @@
 
             move->fromrow += d;
             if (move->fromrow > 6) {
-                return FALSE;
+                return INVALID_POSITION;
             }
         }
     }
-    return TRUE;
+    return VALID_MOVE_SYNTAX;
 }