+int check_xy_exists(int x, int y, bimap *bm)
+{
+ int res = 0;
+ if (getxy(x, y, bm->f) != NULL) res = 1;
+ return res;
+}
+
+int check_space(int x, int y, direction d, int delta, bimap *bm)
+{
+ switch(d){
+ case LEFT: x = x - delta; break;
+ case UP: y = y - delta; break;
+ case RIGHT: x = x + delta; break;
+ case DOWN: y = y + delta; break;
+ }
+ return check_xy_exists(x, y, bm);
+}
+