Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Bb5/3...f5/4. Nc3/4...fxe4/5. Nxe4/5...d5/6. Nxe5/6...dxe4/7. Nxc6/7...Qd5/8. c4/8...Qd6/9. Nxa7/9...Bd7/10. Qh5/10...g6/11. Bxd7

11...Qxd7 is necessary to avoid losing another pawn to 12.Qb5+. It appears to lose a rook instead by unprotecting e5, but accepting the gift turns out to be fraught with danger.