The Classical Variation, Czerniak Defense is a variation of the Benoni Defense, catalogued as ECO A78. The line runs 1. d4 Nf6 2. c4 e6 3. Nf3 c5 4. d5 exd5 5. cxd5 d6 6. Nc3 g6 7. e4 Bg7 8. Be2 O-O 9. O-O Re8 10. Nd2 Na6, reaching the position shown below after 20 half-moves.
White holds the centre with pawns on d5 and e4. Development is level at three minor pieces each. It is White to move after ten 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 e6 3. Nf3 c5 4. d5 exd5 5. cxd5 d6 6. Nc3 g6 7. e4 Bg7 8. Be2 O-O 9. O-O Re8 10. Nd2 Na6. It is a variation of the Benoni Defense and is catalogued as ECO A78.
The Classical Variation, Czerniak Defense is ECO A78. 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 e6 3. Nf3 c5 4. d5 exd5 5. cxd5 d6 6. Nc3 g6 7. e4 Bg7 8. Be2 O-O 9. O-O Re8 10. Nd2 Na6 at +0.74 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 White to move. Both kings have castled kingside, so play tends to shift to the centre and the opposite flank.