The Closed Sicilian: 1.e4 c5 2.Nc3... d6 begins with 1.e4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3 d6 (ECO B25). With 635,582 games on record, the patterns below come from the largest practical sample available.
History and Notable Players
It arises from the Closed Sicilian: 1.e4 c5 2.Nc3... 3.g3. On the White side, Herbert Bastian (73 games), Boris V Spassky (62 games), Ilmars Starostits (59 games) top the database. Notable Black exponents: Istvan Csom (16 games), Ognjen Cvitan (14 games), Miso Cebalo (13 games).
Performance Across Rating Levels
Popularity and results vary sharply by rating level. At 1200 Elo, the opening shows up in 0.00% of games (4,075 samples). White scores 47.7%, Black 48.7%, draws 3.6%. Move up to 1800 Elo and the share shifts to 0.02%, with White winning 51.2% versus Black's 43.8%. Among 2500-rated players the line appears in 0.12% of games and draws spike to 8.8%, indicating tight preparation. Positions also become less sharp as level rises (sharpness 0.96 → 0.91).
Time Control Patterns
Time control matters here: blitz players reach for this opening more than others. In bullet, it appears in 0.01% of games (369,925); White wins 51.9%. Blitz shows 0.02% adoption across 582,232 games, White scoring 49.9%. In rapid, the share rises to 0.00% — 53,350 games, White 47.8%. White's score swings 4.1pp across formats, so time control isn't just a stylistic choice here — it shifts the actual results.
Move Diversity and Theory Depth
What players actually play after the opening moves depends heavily on rating. At 1200 Elo, the top reply is Be3, played 27.4% of the time. There are 5 other moves seeing meaningful share, and 65.8% of games stick to established theory. Entropy: 2.79. By 2500, Be3 dominates at 58.8% of replies; only 3 viable alternatives remain and 91.8% of moves are theory. Entropy drops to 1.72. The narrowing is significant — strong players consolidate around a small set of best moves, while amateurs scatter across many plausible-looking options.
Historical Trends
Tracking the Closed Sicilian: 1.e4 c5 2.Nc3... d6 year over year shows a clear story. Adoption peaked in 2020 at 0.02% (111,795 games). By 2025 it sits at 0.01% — a 83% shift overall, leaving the line on the rise.
Main Lines and Variations
From the position after 1.e4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3 d6, the recognised continuations are:
Each branch leads to a different middlegame character — the resulting pawn structure decides what kind of game you get.
Common Mistakes
- Drifting away from main theory — At 400 Elo, theory adherence sits at 55.9% — versus 91.1% at 2000. The most popular deviation is Nf3 (played 19.7% of the time at 400, much less so up top). It looks fine but quietly hands the better-prepared side an edge.
- 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.
- Ignoring the kingside attack — In sharp Sicilian lines, White typically castles long and pushes the h-pawn. Without your own counterplay on the queenside or in the centre, White's attack lands first.
Practice on Chessiverse
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