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1.d4 Nf6 2.Nf3 d5 3.Bf4 c5 4.e3 Qb6 5.Nc3 · ECO D02
London System: Poisoned Pawn Variation is a chess opening that arises after 1.d4 Nf6 2.Nf3 d5 3.Bf4 c5 4.e3 Qb6 5.Nc3. It is classified D02 in the ECO system, and the position after these moves has black to move.
This line is a variation within the London System 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 d5 3.Bf4 c5 4.e3 Qb6 5.Nc3.