Mikhail Tal at the Leningrad Interzonal, 1973.

During the years 1972-1974, Mikhail Tal famously embarked on two very long series of unbeaten games, which are among the longest ever recorded.  However, between these two unbeaten runs he suffered something of a collapse in form, in a period that crucially included the FIDE Interzonal Tournament held in Leningrad.  As so often in Tal's…

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Why is Mikhail Tal easily one of the best chess players that ever lived in the history of chess? - Quora

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