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Bogo-Indian Defense: Retreat Variation is a chess opening that arises after 1.d4 Nf6 2.c4 e6 3.Nf3 Bb4+ 4.Bd2 Be7. It is classified E11 in the ECO system, and the position after these moves has white to move.
This position can also be reached by 11 other move orders, including 1.d4 Nf6 2.c4 e6 3.g3 Bb4+ 4.Bd2 Be7 5.Bg2 d5 6.Nf3.
This line is a variation within the Bogo-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.c4 e6 3.Nf3 Bb4+ 4.Bd2 Be7.