411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...d5/2. exd5/2...Qxd5/3. Nc3/3...Qc6/4. Bb5
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Scandinavian Defense rd nd bd kd bd nd rd pd pd pd pd pd pd pd qd bl nl pl pl pl pl pl pl pl rl bl ql kl nl rl
Scandinavian Defense: Mieses-Kotrč Variation, Botez Gambit Accepted, 3. Nc3 Qc6 4. Bb5
There is no way for black to save their queen now, unless white fails to (re)capture.
Qxb5 allows the knight to recapture, immediately threatening a king-rook fork on the c7 square.
Bd7 aims to compensate, because after 4... Bd7, 5. Bxc6 Bxc6, black immediately threatens to regain some compensation by capturing the g2 pawn and the h1 rook, though this is easily refuted with Nc3.
Nf6 and recapturing with Nxc6 allows black to gain compensation through two tempos, allowing black the initiative, albeit without a queen.