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Also, year 1921 science fiction novel ''The Chessmen of Mars'' by Edgar Rice Burroughs interweaves the story and the Rules of chess-form ''Jetan'' within Chapter 2 of the text and an Appendix, the famous two versions of Jetan. USA television series 1966-1969 shows ''Star Trek Chess'' in enough episodes for determining the Tridimensional Chess' Rules. Proto-Chess presented that way shows the author considers the variation important enough to think out symbolism. Presumably David Howe's Nomic Chess allows lots of room for differing interpretation that can be nailed down specifically in a given context or occurrence, almost like role-playing. Feliz Navidad.