Which lines?
Maybe just to gain space? Hard to say without knowing exactly where he wants you to play b4.
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I'm watching an Openings for Beginners video http://www.chess.com/video/player/openings-for-beginners-the-old-indian-defense and FM Lilov is talking about the importance of white getting his pawn to B4.
I'm curious, why is that crucial?
Thank you!