Phutball is PSPACE-hard
arXiv:0804.1777 · doi:10.1016/j.tcs.2010.08.019
Abstract
We consider the game of Phutball. It is shown that, given an arbitrary position of stones on the board, it is a PSPACE-hard problem to determine whether the specified player can win the game, regardless of the opponent's choices made during the game.
13 pages, 7 figures