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1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6 5.b6 · ECO A57
Benko Gambit Accepted: Pawn Return Variation is a chess opening that arises after 1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6 5.b6. 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 Accepted 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.cxb5 a6 5.b6.