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Benko Gambit: Zaitsev System is a chess opening that arises after 1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6 5.Nc3. 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.cxb5 a6 5.Nc3.
Each of these is a named opening reached by playing on from 1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6 5.Nc3. Open any of them to load the position on the board.