Rossolimo
1.e4 c5 2.Nf3 Nc6 3.Bb5 · you play white
6 chapters, 8 moves deep, get you to 92% of what you will actually meet. The other 2 cover the last 4%.
Course progress
0 of 152 decisions
0 still learning · 152 not asked yet
2 more chapters are below the depth for your level, together 4% of what you meet.
Drill this opening
Any chapter or study, asked cold — whether or not you owe it. Nothing here is unlocked by anything else.
At your level
Level
Improving
Depth
16 plies of this opening
Chapters
6
Decisions
152
0/152
How this goes wrong at your level
Counted from 4,500,000 games by players in your band. These are moves that get played often and then lose — no engine was asked for an opinion.
What you are most likely to fall for
1.e4 c5 2.Nf3 Nc6 3.Bb5 Nd4 4.Nxd4 cxd4
d3 — played 23% of the time here.
You score 38% after it, against 52% for everything else played from this position, over 286 games.
Instead:
Bc4
61%
O-O
55%
Qf3
48%
1.e4 c5 2.Nf3 Nc6 3.Bb5 a6
Ba4 — played 4% of the time here.
You score 35% after it, against 55% for everything else played from this position, over 99 games.
Instead:
Be2
66%
Bxc6
55%
Bc4
49%
Found by testing 94,688 decisions in your band’s games and keeping only those where the drop in score is more than four standard errors below the alternatives. About 3.17 of these would be expected by chance alone.
Your moves are chosen by the engine and checked against 3,439,091 games (Lichess Elite (2500+ vs 2300+), 2024-12 → 2025-11); their replies are what people actually play. Evaluations from Lichess Stockfish evaluations (database.lichess.org) (CC0 1.0 Universal), covering 89% of this course.