ECO D01. A chess opening with 3 known variations.
Every line in this family begins 1. d4 Nf6 2. Nc3 d5 3. Bf4 g6 4. e3 Bg7, then branches. Each variation below has its own page with the full move order, the position it reaches, and a Stockfish evaluation.
All 1 line can be practised free in the browser: pick a variation, walk it move by move in Learn mode, then drill it from memory until you can play it without prompting.
The Rapport-Jobava System begins 1. d4 Nf6 2. Nc3 d5 3. Bf4 g6 4. e3 Bg7. From there it branches into 1 named variation, each with its own move order and typical plans.
The Rapport-Jobava System is catalogued under ECO code D01. Individual variations list their own specific code on their page.
Open any variation on Chess Ramp and use Learn mode to walk the line one move at a time, then Drill mode to replay it from memory. Practice runs in your browser with no account required.