A Puzzle involving disentangling a set of rings from a looped double rod (also called Chinese Rings). The
minimum number of moves needed for rings is
References
Dubrovsky, V. ``Nesting Puzzles, Part II: Chinese Rings Produce a Chinese Monster.''
Quantum 6, 61-65 (Mar.) and 58-59 (Apr.), 1996.
Gardner, M. ``The Binary Gray Code.'' In Knotted Doughnuts and Other Mathematical Entertainments. New York:
W. H. Freeman, pp. 15-17, 1986.
Kraitchik, M. ``Chinese Rings.'' §3.12.3 in Mathematical Recreations. New York: W. W. Norton,
pp. 89-91, 1942.
Steinhaus, H. Mathematical Snapshots, 3rd American ed. New York: Oxford University Press, p. 268, 1983.