Enigma 175: Hexagon-wiggling
11 March 2014
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From New Scientist #1320, 26th August 1982 [link]
The rules for hexagon-wiggling are simple. You start with a hexagonal pattern of dots, lying in the junctions of a regular 60° grid. You then begin at any dot, and follow path from dot to dot along the grid lines. You must wiggle at every dot you come to you; that is, each leg of the path must lie at 60° or 120° to the previous leg. Your path must include every dot. Finally, the path should, if possible, be re-entrant.
The hexagon at (a) has been wiggled with complete success according to these rules. Can you wiggle those at (b) and (c)?
The term “re-entrant” is used here to denote that the path is closed (i.e. a loop or circuit that can be started at any point, rather than an open path with a beginning and an end).