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conway math
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 several ways. I end with a challenge for the solution the general problem.