The Classical Variation, Czerniak Defense is a variation of the Benoni Defense, catalogued as ECO A79. The line runs 1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. Nf3 Bg7 8. Be2 O-O 9. O-O Re8 10. Nd2 Na6 11. f3, reaching the position shown below after 21 half-moves.
White holds the centre with pawns on d5 and e4. Development is level at three minor pieces each. It is Black to move after 11 moves. Both kings have castled kingside, so play tends to shift to the centre and the opposite flank.
On the Benoni Defense generally: An aggressive defense where Black accepts a space disadvantage for dynamic counterplay.
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The Classical Variation, Czerniak Defense goes 1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. Nf3 Bg7 8. Be2 O-O 9. O-O Re8 10. Nd2 Na6 11. f3. It is a variation of the Benoni Defense and is catalogued as ECO A79.
The Classical Variation, Czerniak Defense is ECO A79. ECO codes group openings by their move order, so nearby codes cover closely related lines of the Benoni Defense.
Stockfish evaluates the position after 1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. Nf3 Bg7 8. Be2 O-O 9. O-O Re8 10. Nd2 Na6 11. f3 at +0.78 at depth 18, which is a small but real edge for White. Engine evaluation is only a starting point — at club level the practical value of a line is mostly about whether you know its plans better than your opponent does.
White holds the centre with pawns on d5 and e4. Development is level at three minor pieces each. It is Black to move. Both kings have castled kingside, so play tends to shift to the centre and the opposite flank.