#define IS_FREE(x,y) (Feld[x][y] == EL_LEERRAUM && !IS_PLAYER(x,y))
#define IS_FREE_OR_PLAYER(x,y) (Feld[x][y] == EL_LEERRAUM)
#define IS_FREE(x,y) (Feld[x][y] == EL_LEERRAUM && !IS_PLAYER(x,y))
#define IS_FREE_OR_PLAYER(x,y) (Feld[x][y] == EL_LEERRAUM)