|Phutball (short for Philosopher's Futball) is a two-player abstract board game played on a 19x15 grid that was invented by John Horton Conway.
Phutball is played on a board with 15x21 intersections using one white stone representing a ball and as many black stones as needed representing men (or players). The 19th row is the goal line of the Blue player and the 1st row is the goal line of the Red player. There are two additional rows numbered 0 and 20 representing "off the board" beyond the 1st and 19th rows respectively. The ball is initially placed it the middle of the board:
|Object of the Game
The goal of Phutball is move the ball (the white stone) onto or beyond the opponent's goal line.
I.e. the Red player wins if the ball is placed on the 19th or the 20th row and the Blue player wins if the ball is placed on the 1st or the 0th row after a move.
The game begins with the ball (the white stone) placed in the middle of the board.
Players move alternately doing one of the following:
If the ball ends up on or beyond the opponent's goal line then the game ends and the player wins.
If the ball passes through a goal line, but ends up elsewhere due to further jumps, the game continues: