ABSTRACT
This chapter describes a related problem in which a similar sequence is to be found for a 4 × 4 board using 16 arrows, each of which indicates a particular move — a sort of “Archer’s Tour.” There are three types of arrows, differing from each other in the number of pairs of tail feathers. The three types are 3-arrows, 2-arrows, and 1-arrows, respectively. The 16 arrows consist of seven 3-arrows, eight 2-arrows, and one 1-arrow and may be placed on the board so as to point upwards, downwards, or to the left or right. Initial attempts to build up a solution usually fail because a point is reached when, with only a few arrows left to be put in place, none of them can be joined to the part of the circuit already constructed.
