411 REFERENCE · Wikibooks
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
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French Defence: Advance Variation rd bd kd bd nd rd pd pd pd pd pd pd bl pd pl qd pl pl pl pl pl rl nl bl ql kl rl
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.