Averbakh System

The Averbakh System arises when White meets the Modern Defense by occupying the center with pawns on c4, d4 and e4, the broad formation familiar from the King's Indian. ECO classifies it as A42. It is reached from the queen's pawn order 1. d4 g6 2. c4 Bg7 3. Nc3 d6 4. e4 and also from 1. e4 g6 2. d4 Bg7 3. c4 d6 4. Nc3. Because Black has not yet committed the king's knight, the position is a crossroads rather than a fixed structure. White gains space and a clamp on d5, and Black's play is usually directed against d4.

The most common reply, 4...Nf6, transposes to the King's Indian Defense. The other options keep the game in Modern territory. The Kotov Variation, 4...Nc6, presses d4 with the knight. The flexible 4...Nd7 prepares ...e5 while keeping the f6-square free. The immediate 4...e5 challenges the center directly. The Randspringer Variation, 4...f5, strikes at e4 at once and is rarely played. Engines give White a slight edge, but online results are almost level, and 4...Nc6 scores slightly better for Black than the other replies.