1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3 Bg7 8.Be2 0-0 9.0-0 a6 10.a4 Bg4 opens the Benoni Defense: Classical Variation, Argentine Counterattack, ECO A75. With 20,134 games on record, the patterns below come from the largest practical sample available.
History and Notable Players
It arises from the Benoni Defense: Classical Variation, Full Line. Among the most prolific White practitioners are Svetozar Gligoric (10 games), Krzysztof Panczyk (5 games), Alexander G Beliavsky (5 games). Black-side regulars include Roi Reinaldo Castineira (7 games), Nick E De Firmian (5 games), Milos Pavlovic (4 games).
Move Diversity and Theory Depth
Move choice is far from uniform in the Benoni Defense: Classical Variation, Argentine Counterattack. At 1200 Elo, the top reply is h3, played 41.2% of the time. There are 6 other moves seeing meaningful share, and 82.4% of games stick to established theory. Entropy: 2.18. By 2500, Nd2 dominates at 45.4% of replies; only 3 viable alternatives remain and 90.6% of moves are theory. Entropy drops to 2.02.
Common Mistakes
- Playing outside main lines — At 400 Elo, only 0% of moves follow established theory — at 2000 that climbs to 81.7%. Most of the gap is players who pick a reasonable-looking move over the best one, and the position quietly drifts.
- Neglecting development — It can feel productive to make extra pawn moves early, but falling behind in piece development is what loses most amateur games — especially in open positions where active pieces find squares fast.
- Letting White own the centre — Hypermodern openings concede central space on purpose, but only if you strike back in time. Delay the counter-blow and you end up squeezed.
Practice on Chessiverse
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