play_at
npp = play_at(y, x);
newp = play_at(y, x);
newp = play_at(y, x);
pp = play_at(r->r_y, r->r_x);
PLAYER *play_at(int, int);
pp = play_at(y, x);
pp = play_at(y, x);
pp = play_at(bp->b_y, bp->b_x);
pp = play_at(y, x);
pp = play_at(bp->b_y, bp->b_x);