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Réti Opening: Reversed Blumenfeld Gambit is a chess opening that arises after 1.Nf3 d5 2.c4 d4 3.e3 c5 4.b4. It is classified A09 in the ECO system, and the position after these moves has black to move.
This line is a variation within the Réti Opening family. The strategic ideas above describe the family as a whole; this particular line reaches them by the move order 1.Nf3 d5 2.c4 d4 3.e3 c5 4.b4.