Chessboard
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A chessboard was the board on which chess was played. (TV: Nightmare in Silver [+]Loading...["Nightmare in Silver (TV story)"])
The Fourth Doctor recounted an aphorism referencing a chessboard, initially misstating it with the erroneous term cheeseboard, attributing the original to his "old friend Huxley". (TV: Logopolis [+]Loading...["Logopolis (TV story)"])