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Milan Matulovic and István Bilek at the Sousse Interzonal in 1967. Matulovic played a losing move but then took it back after saying "J'adoube" ("I adjust"--which should be announced before adjusting pieces on their square). His opponent complained to the arbiter but the modified move was allowed to stand. This incident earned Matulovic the nickname "J'adoubovic".

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