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1.c4 e6 2.d4 b6 3.Nc3 Bb7 4.e4 f5 5.exf5 Nf6 · ECO A40
English Defense: Hartlaub Gambit Accepted is a chess opening that arises after 1.c4 e6 2.d4 b6 3.Nc3 Bb7 4.e4 f5 5.exf5 Nf6. It is classified A40 in the ECO system, and the position after these moves has white to move.
This line is a variation within the English Defense family. The strategic ideas above describe the family as a whole; this particular line reaches them by the move order 1.c4 e6 2.d4 b6 3.Nc3 Bb7 4.e4 f5 5.exf5 Nf6.