The idea in one sentence
Black hits e4 at once and recaptures with the queen; it loses a tempo after Nc3 but gets a clear, easy development.
♔ White's plans
- Gain time by hitting the queen
- Take the centre with d4
- Develop and use the lead in development
♚ Black's plans
- Challenge e4 at once with ...d5
- Put the queen on a5, where it pins Nc3
- Develop the bishop to f5 before ...e6
Pawn structure. Black has a solid c6-e6 structure later; White has more central space.
How to learn it
- Read the idea and the plans: every move below serves one of them.
- In the story, ask of each move: what does it do, what does it stop, what does it prepare, why not the other one?
- Drill your side. At the key moves you name the idea first, then play the move.
- Missed moves come back first next time, and in your journal.
The defining moves
- 1...d5 attacks e4 at once.
- 2...Qxd5 recaptures; the queen comes out early, but there is no other way to win the pawn back.
- 3.Nc3 develops with a gain of time, attacking the queen.
- 3...Qa5 keeps the queen active and pins the knight to the king along the diagonal.
- 5...Bf5 develops the bishop outside the pawn chain.
The line follows the moves masters play most (Lichess masters database), each checked by Stockfish 19 at depth 22; where the book move is not Stockfish's first choice, the story says so. Scores are in pawns from White's side: +0.30 is good for White, −0.30 for Black.