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votacommunista: Shirov has also used it . . . however, I think most Nimzo enthusiasts haven't studied the f3 line (instead voting for the Nf3 stuff) and so you may catch even a seasoned Nimzo-indian player off guard with f3.
(hide) If you want to find an opponent with similar playing skills to your own look in the Ratings page of the type of game you want and find a player with a similar BKR. (pauloaguia) (show all tips)