conway.pdf

The Angel Problem JOHN H. CONWAY Abstract. Can the Devil, who removes one square per move from an in- nite chessboard, strand the Angel, who can jump up to 1000 squares per move? It seems unlikely, but the answer is unknown. Andreas Blass and I have proved that the Devil can strand an Angel who\'s handicapped in one of s everal ways. I end with a challenge for the solution the general problem. everal ways. I end with a challenge for the solution the general problem.