London System, with Be2 · if they play 1...Nf6
A48 · London System, with Be2 · you play White
This is the branch for when your opponent leaves the Queen's Pawn Game main line with 1...Nf6.
The idea
Against a king-side fianchetto keep the same set-up; h3 gives the bishop a retreat on h2.
The moves
1. d4 Nf6 2. Bf4 g6 3. e3 Bg7 4. Nf3 O-O 5. Be2 d6 6. h3
Free, no sign-up. The board plays the other side and you play every one of your moves. A line you miss comes back tomorrow; one you get comes back after 3 days, then a week, then three weeks.
Opening names from the Lichess chess-openings list (CC0). Every line was checked move by move by the rules engine. Part of Chess Path, a free chess course.