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
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French Defence: Advance Variation rd bd kd bd nd rd pd pd pd pd pd qd pd pd pl nd bl nl pl pl pl pl pl rl nl bl ql kl rl
7...Nxd4?
This seemingly obvious move is a mistake. Black just lost his knight to a discovered attack threat.
Theory table
8 9Nxd4
Qxd4 Bb5+ +-