Starting from 1.e4 c5 2.Nf3 d6 3.Bb5+ Bd7, players enter the Sicilian Defense: Moscow Variation, Main Line — ECO B52. Across rating levels it shows up in 3,760,058 recorded games — enough data to map exactly where it succeeds and where it stalls.
History and Notable Players
It arises from the Sicilian Defense: Moscow Variation. On the White side, Sergei Rublevsky (51 games), Igor Glek (43 games), Eduardas Rozentalis (39 games) top the database. Notable Black exponents: Krum Georgiev (35 games), Kiril Georgiev (30 games), Georg Danner (27 games).
Performance Across Rating Levels
The picture changes a lot as you climb the rating ladder. At 1200 Elo, the opening shows up in 0.04% of games (282,943 samples). White scores 47.3%, Black 48.2%, draws 4.6%. Move up to 1800 Elo and the share shifts to 0.10%, with White winning 48.4% versus Black's 45.4%. Among 2500-rated players the line appears in 0.43% of games and draws spike to 11.7%, indicating tight preparation. Positions also become less sharp as level rises (sharpness 0.95 → 0.88).
Time Control Patterns
Look at the same opening across time controls and blitz stands out. In bullet, it appears in 0.05% of games (1,411,653); White wins 49.8%. Blitz shows 0.08% adoption across 3,017,808 games, White scoring 48.6%. In rapid, the share rises to 0.07% — 742,250 games, White 47%. White's score swings 2.8pp 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 (282,943 games), the top reply is Bxd7+, played 62.1% of the time. Three other moves each take at least 5% of games, and the top three moves account for 86.9% of games. Entropy: 1.82. By 2500 (58,204 games), Bxd7+ dominates at 78.2% of replies; only two other moves still reach 5% and the top three moves account for 98.8% of games. Entropy drops to 1.06. The narrowing is significant — strong players consolidate around a small set of best moves, while amateurs scatter across many plausible-looking options.
Historical Trends
Year-over-year data tells you whether this opening is a contemporary fixture or a fading one. Adoption peaked in 2020 at 0.10% (564,333 games). By 2025 it sits at 0.06%, 37% below the peak and 13% under its 2013 level, leaving the line in decline.
Common Mistakes
- Drifting away from main theory — At 400 Elo, the three most-played moves cover 84.4% of games, against 93.6% at 2000. The most popular deviation is Bc4 (played 17.6% 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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