 Harary's generalized tic-tac-toe

Harary's generalized tic-tac-toe or animal tic-tac-toe is a generalization of the game tic-tac-toe, defining the game as a race to complete a particular polyomino on a square grid of varying size, rather than being limited to "in a row" constructions.It was devised by Frank Harary in March 1977, and is a broader definition than that of an m,n,k-game.