The Opocensky Variation is a variation of the Queen's Indian Defense, catalogued as ECO E17. The line runs 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. Nc3 Ne4 7. Bd2, reaching the position shown below after 13 half-moves.
White holds the centre with pawns on d4. Development is level at four minor pieces each. It is Black to move after seven moves.
On the Queen's Indian Defense generally: A flexible defense to 1.d4 where Black fianchettoes the queen's bishop to control e4.
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The Opocensky Variation goes 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. Nc3 Ne4 7. Bd2. It is a variation of the Queen's Indian Defense and is catalogued as ECO E17.
The Opocensky Variation is ECO E17. ECO codes group openings by their move order, so nearby codes cover closely related lines of the Queen's Indian Defense.
Stockfish evaluates the position after 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. Nc3 Ne4 7. Bd2 at +0.36 at depth 18, which is a slight pull for White, within normal opening margins. 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 d4. Development is level at four minor pieces each. It is Black to move.