diff -r 02c509a44e98 -r 41017d0a72c5 src/chess/rules.h
--- a/src/chess/rules.h	Wed Jun 11 16:54:20 2014 +0200
+++ b/src/chess/rules.h	Mon Jun 16 13:45:31 2014 +0200
@@ -110,11 +110,12 @@
 
 typedef struct {
     Board board;
-    uint8_t mycolor;
     MoveList* movelist;
     MoveList* lastmove;
     _Bool checkmate;
     _Bool stalemate;
+    _Bool remis;
+    _Bool resign;
 } GameState;
 
 #define opponent_color(color) ((color)==WHITE?BLACK:WHITE)
@@ -141,6 +142,16 @@
 #define fileidx_s(c) (isfile(c)?fileidx(c):POS_UNSPECIFIED)
 #define rowidx_s(c) (isrow(c)?rowidx(c):POS_UNSPECIFIED)
 
+#define is_game_running(gamestate) !((gamestate)->checkmate || \
+    (gamestate)->resign || (gamestate)->stalemate || (gamestate)->remis)
+
+
+/**
+ * Initializes a game state and prepares the chess board.
+ * @param gamestate the game state to initialize
+ */
+void gamestate_init(GameState *gamestate);
+
 /**
  * Cleans up a game state and frees the memory for the movement list.
  * @param gamestate the game state to clean up
@@ -276,9 +287,10 @@
  * @param gamestate the current game state
  * @param mstr the input string to parse
  * @param move a pointer to object where the move data shall be stored
+ * @param color the color of the player to evaluate the move for
  * @return status code (see macros in this file for the list of codes)
  */
-int eval_move(GameState *gamestate, char *mstr, Move *move);
+int eval_move(GameState *gamestate, char *mstr, Move *move, uint8_t color);
 
 /**
  * Validates move by applying chess rules.