The idea in one sentence
Black takes on e4, gives up castling and trades queens into an endgame with the two bishops, solid enough that it became a world-championship weapon.
♔ White's plans
- Win back the pawn with tempo using d4 and Re1
- In the endgame, use the e5 pawn and the kingside majority
- Keep the black bishops passive
♚ Black's plans
- Take the e4 pawn and return it on your terms
- Accept the king on d8: with queens gone it is safe
- Use the bishop pair and a sound queenside
Pawn structure. Queens off early; White has a 4 v 3 kingside majority, Black has doubled c-pawns but two bishops.
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
- 3...Nf6 counter-attacks e4 instead of asking the bishop to leave.
- 4...Nxe4 takes the pawn: White's lead in development will win it back, but only by heading for an endgame.
- 5.d4 opens the centre while Black's king is still in it.
- 5...Nd6 hits the bishop and returns to safety.
- 8.Qxd8+ trades queens: without them, Black's king in the centre is no longer a target.
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.