Nimzo Indian defense is the most popular reply to 1.d4. Black pins white knight to the king and temporarily eliminates the move e4 by white. Black is willing to give away his bishop pair for quick development and white's structural weaknesses . The Nimzo Indian defense is played by most GMs today . Statistically it's one of the best scoring defenses , thus white often avoids it by playing simply 3.Nf3.

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http://www.mediafire.com/watch/bx8ooqxsd27ejsp/Nimzo.mp4