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1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Bb4+ 6.Bd2 Bxd2+ 7.Qxd2 O-O 8.Nc3 Ne4 9.Qc2 Nxc3 10.Ng5 · ECO E11
Bogo-Indian Defense: Monticelli Trap is a chess opening that arises after 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Bb4+ 6.Bd2 Bxd2+ 7.Qxd2 O-O 8.Nc3 Ne4 9.Qc2 Nxc3 10.Ng5. It is classified E11 in the ECO system, and the position after these moves has black to move.
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 b6 4.g3 Bb7 5.Bg2 Bb4+ 6.Bd2 Bxd2+ 7.Qxd2 O-O 8.Nc3 Ne4 9.Qc2 Nxc3 10.Ng5.