The big idea

What the Scandinavian Defence is really about.

The most direct answer to 1.e4: Black challenges the king's pawn on the very first move. After the centre is exchanged, the queen usually comes out early to recapture, which breaks a beginner's rule — but here it is well-timed, because the queen retreats to safety while Black completes fast, harmonious development.

White's plan: Gain time by harassing Black's early queen with natural developing moves like Nc3 and d4, build a broad pawn centre, and use the lead in development to press for a lasting space advantage.
Black's plan: Recapture on d5, tuck the queen onto a safe square, and develop quickly and simply with ...Nf6, ...c6, ...Bf5 and a kingside castle, reaching a solid, easy-to-play position with no weaknesses.

After 1.e4 d5

The Scandinavian grabs the centre immediately with 1...d5. After the queen settles on a5, Black develops the bishop to f5 OUTSIDE the pawn chain and reaches a solid, easy-to-play structure.

Developing the queen early usually breaks the rules. Why is ...Qxd5 (and ...Qa5) fine here?

Answer the question to keep going!