These new worlds and new characters allow Burroughs to speculate about societies structured along many lines. Some, like Gulliver's Travels, provide material for satiric parallels to the real world, while others attempt more imaginative leaps into theoretically-structured worlds. In their marvelous Dictionary of Imaginary Places, Alberto Manguel and Gianni Guadalupi include some fifty entries from Burroughs's works (more than any author save Tolkien), and these only include Earth and inner-Earth settings, not the myriad Martian worlds. Carter presents detailed social and cultural accounts of the strange new peoples he encounters, as for instance in the discussions of the Tharks' education, child rearing, military, and courtship practices. For The Chessmen of Mars Burroughs devised the chesslike jetan, with detailed instructions and rules, which John Gollon included in his book Chess Variations (1968), calling the game "quite good — very playable and entertaining." The novel features a game played with living...