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Indian Defense: London System is a chess opening that arises after 1.d4 Nf6 2.Nf3 e6 3.Bf4. It is classified A46 in the ECO system, and the position after these moves has black to move.
This line is a variation within the Indian Defense family. The strategic ideas above describe the family as a whole; this particular line reaches them by the move order 1.d4 Nf6 2.Nf3 e6 3.Bf4.