Go played on a 13x13 sized board.

A medium-sized 13x13 board is frequently seen as a way to transition beginners from 9x9 board to the full 19x19 board. Like the 9x9 board, 13x13 games are still played by advanced players who are looking for a shorter game or some variety. The 13x13 board offers more complexity than a 9x9 and allows more strategy into the game.