Starting from 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Qb3 dxc4 6.Qxc4 0-0 7.e4 Bg4 8.Be3 Nfd7 9.Qb3, players enter the Grünfeld Defence, Russian System: 1.d4 Nf6 2.c4... 9.Qb3 — ECO D99. Lichess records 193 games in this line, which gives us a reliable view of how it actually performs in practice.
History and Notable Players
It arises from the Grünfeld Defence, Russian System: 1.d4 Nf6 2.c4... Bg4. On the White side, Vlastimil Babula (14 games), Gennadi Sosonko (11 games), Alexander G Beliavsky (6 games) top the database. Notable Black exponents: Jan H Timman (9 games), Jan Smejkal (9 games), Vlastimil Jansa (9 games).
Move Diversity and Theory Depth
Move choice is far from uniform in the Grünfeld Defence, Russian System: 1.d4 Nf6 2.c4... 9.Qb3. At 1200 Elo, the top reply is —, played 0% of the time. There are 0 other moves seeing meaningful share, and 0% of games stick to established theory. Entropy: 0.00. By 2500, Nb6 dominates at 90% of replies; only 2 viable alternatives remain and 100% of moves are theory. Entropy drops to 0.47. Even elite players don't fully agree on the best continuation here, which keeps the position dynamic.
Common Mistakes
- Playing outside main lines — At 400 Elo, only 0% of moves follow established theory — at 2000 that climbs to 90.2%. Most of the gap is players who pick a reasonable-looking move over the best one, and the position quietly drifts.
- Neglecting development — Extra pawn moves in the opening are tempting, especially when you "know the moves". Developing a piece each turn is the simple correction.
- Playing without a plan — Each Grünfeld Defence, Russian System: 1.d4 Nf6 2.c4... 9.Qb3 middlegame demands a specific approach. Decide whether the position calls for attack, manoeuvre, or simplification before reaching for a move.
Practice on Chessiverse
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