Benoni Defense: Old Benoni, Mujannah Formation

1.
1. d4
2. c5
2.
3. d5
4. f5

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The Benoni Defense: Old Benoni, Mujannah Formation is a chess opening classified under ECO code A43 (Flank openings). It is a variation of the Benoni Defense family. Step through the moves on the board above, then play the line yourself or review it with the built-in engine.