Chess Opening Theory/1. e4/1...e6/2. d4/2...d5/3. e5/3...c5/4. c3/4...Nc6/5. Nf3/5...Qb6/6. Bd3/6...cxd4/7. cxd4/7...Nxd4/8. Nxd4/8...Qxd4/9. Bb5

9.Bb5+!
This move discovers an attack on the black queen. Black is also in check, so he has no time to save his queen.