The Benoni Defense is a group of chess openings generally characterized by the opening moves 1. d4 c5 2. d5, although Black's ...c5 and White's answer d5 are often delayed. The most usual opening sequence for the Benoni is 1. d4 Nf6 2. c4 c5 3. d5. Black can then sacrifice a pawn by 3...b5 (the Benko Gambit), but if Black does not elect this line then 3...e6 is the most common move (though 3...d6 or 3...g6 are also seen, typically leading to main lines).
Read more about Benoni Defense: Etymology, Old Benoni, Czech Benoni, Modern Benoni, Encyclopedia of Chess Openings
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