Chess Opening Theory/1. e4/1...e5/2. Nf3/2...f5/3. Bc4/3...fxe4/4. Nxe5/4...d5

Polerio-Svedenborg variation C40 Latvian gambit → Mayet attack → 4. Nxe5 4...d5 · Polerio-Svedenborg variation The best and most common move. Black now is attacking White's bishop on c4 and preventing Nf7. But 4. Nxe5 carried a second threat: 5. Qh5+!. However, if Black finds 5...g6!? to sacrifice the exchange after 6. Nxg6 hxg6 7. Qxh8 Kf7!, the position is objectively equal. It's true that White can save the bishop with 5. Bb5+ or 5. Be2 (5. Bb3?? loses to 5...Qg5!), but it lacks the aggression and force of Qh5+, so 5. Qh5+ is more preferred.