Garry Kasparov writes.
Garry Kimovich Kasparov ( Га́рри Ки́мович Каспа́ров , [ ˈɡarʲɪ ˈkʲiməvʲɪtɕ kɐˈsparəf ] ; born Garik Kimovich Weinstein , 13 April 1963 ) is a Russian chess grandmaster , former World Chess Champion , writer , and political activist , whom many consider to be the greatest chess player of all time . Kasparov announced his retirement from professional chess on 10 March 2005 , after which he devoted his time to politics and writing .