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Benko Gambit: Mutkin Countergambit is a chess opening that arises after 1.d4 Nf6 2.c4 c5 3.d5 b5 4.g4. It is classified A57 in the ECO system, and the position after these moves has black to move.
This line is a variation within the Benko Gambit 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 c5 3.d5 b5 4.g4.