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Benko Gambit Accepted is a chess opening that arises after 1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6. It is classified A57 in the ECO system, and the position after these moves has white to move.
Each of these is a named opening reached by playing on from 1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6. Open any of them to load the position on the board.