13x13 at IYT rarely fills and 15x15 pro version is even rarer...i've personally never seen it happen....so 15x15 would be a good size...20x20 is more of a "Go" size.
(hide) If you want to find an opponent with similar playing skills to your own look in the Ratings page of the type of game you want and find a player with a similar BKR. (pauloaguia) (show all tips)