Starting from 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7 6.0-0 0-0 7.Nc3 Ne4 8.Qc2 Nxc3 9.Qxc3, players enter the Queen's Indian Defence: 1.d4 Nf6 2.c4... 9.Qxc3 — ECO E19. With 56,063 games on record, the patterns below come from the largest practical sample available.
History and Notable Players
It arises from the Queen's Indian Defence: 1.d4 Nf6 2.c4... 7.Nc3. On the White side, Borislav Ivkov (37 games), Ulf Andersson (20 games), Miguel Najdorf (14 games) top the database. Notable Black exponents: Anatoly Karpov (25 games), Aleksandar Matanovic (20 games), Miguel Najdorf (18 games).
Performance Across Rating Levels
How well the Queen's Indian Defence: 1.d4 Nf6 2.c4... 9.Qxc3 works depends on what level you're playing at. Among 1200-rated players, it appears in 0.00% of games — 18 of them on record — with White winning 61.1% and Black 33.3%. By 1800, popularity is 0.00% and White's score is 41.4% to Black's 50.5%. Among 2500-rated players the line appears in 0.02% of games and draws spike to 14.2%, indicating tight preparation. White's edge erodes by 16.2pp from 1200 to 2500 Elo, suggesting Black's counterplay is easier to find with experience.
Move Diversity and Theory Depth
Move choice is far from uniform in the Queen's Indian Defence: 1.d4 Nf6 2.c4... 9.Qxc3. At 1200 Elo, the top reply is c5, played 38.9% of the time. There are 9 other moves seeing meaningful share, and 66.7% of games stick to established theory. Entropy: 2.70. By 2500, d6 dominates at 32.9% of replies; only 5 viable alternatives remain and 71.7% of moves are theory. Entropy drops to 2.42.
Common Mistakes
- Playing outside main lines — At 400 Elo, only 0% of moves follow established theory — at 2000 that climbs to 74.5%. 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.
- Letting White own the centre — Hypermodern openings concede central space on purpose, but only if you strike back in time. Delay the counter-blow and you end up squeezed.
Practice on Chessiverse
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