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Oct 22, 2021 at 17:09 comment added Roland Bacher Thanks for this comment. Their game is slightly different in the sense that they consider an arc to have only one end and they allow thus in this case removal of a unique chip from a vertex (they claim that the game obtained by removing two chips from a vertex is similar without going into details: this seems indeed to be the case).
Oct 18, 2021 at 13:31 history answered Timothy Chow CC BY-SA 4.0