Japanese Tic-tac-toe

Hiroba do is a classical japanese two-player board game. Hiroba do a bit like tic-tac-toe, but instead of trying to get three in a row you are trying to get four in a square. Two players take turns placing pieces on an 8 by 8 board. When a player gets four pieces at the corners of a square, the square is drawn in and the player gets points. Squares may be any size or tipped at any angle. Bigger squares get more points.