diff -r 41bbfd4d17a3 -r 824c9522ce66 src/chess/pawn.c
--- a/src/chess/pawn.c	Mon Mar 31 14:08:00 2014 +0200
+++ b/src/chess/pawn.c	Mon Mar 31 15:03:25 2014 +0200
@@ -30,7 +30,7 @@
 #include "pawn.h"
 #include "rules.h"
 
-_Bool pawn_chkrules(Board board, Move *move) {
+_Bool pawn_chkrules(GameState *gamestate, Move *move) {
     int8_t d = ((move->piece & COLOR_MASK) == WHITE ? -1 : 1);
     
     if (move->torow == (d < 0 ? 7 : 0)) {
@@ -53,8 +53,9 @@
             move->fromfile == move->tofile + 1 ||
             move->fromfile == move->tofile - 1)) {
 
-            return mdst(board,move)
-                || (board[move->fromrow][move->tofile] & ENPASSANT_THREAT);
+            return mdst(gamestate->board, move) ||
+                (gamestate->board[move->fromrow][move->tofile]
+                & ENPASSANT_THREAT);
         } else {
             return 0;
         }
@@ -69,11 +70,11 @@
     }
 }
 
-_Bool pawn_isblocked(Board board, Move *move) {
-    return mdst(board,move) && !move->capture;
+_Bool pawn_isblocked(GameState *gamestate, Move *move) {
+    return mdst(gamestate->board, move) && !move->capture;
 }
 
-int pawn_getlocation(Board board, Move *move) {
+int pawn_getlocation(GameState *gamestate, Move *move) {
     int8_t d = ((move->piece & COLOR_MASK) == WHITE ? -1 : 1);
     
     if (move->fromfile == POS_UNSPECIFIED) {
@@ -85,7 +86,7 @@
     } else {
         /* advanced first move */
         if (move->fromrow == (d < 0 ? 2 : 5) &&
-            msrc(board,move) != move->piece) {
+            msrc(gamestate->board,move) != move->piece) {
 
             move->fromrow += d;
             if (move->fromrow > 6) {