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Several incarnations of the Doctor have been shown playing chess. The Fourth Doctor played against K9 ("The Sun Makers", "The Androids of Tara") & against Magnus Greel ("The Talons of Weng-Chiang"). The Sixth played against Frobisher ("War-Game" (comic story)). The Seventh played against Ace ("Silver Nemesis") & Fenric ("The Curse of Fenric"). The Eighth suggested a game of chess when told he had only 4 minutes to live ("The Night of the Doctor"). The Eleventh played against Gantok ("The Wedding of River Song") & against a Cyber-Planner -- & claimed that the Time Lords had invented the game ("Nightmare in Silver").