411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Bc4/3...Nf6/4. Ng5/4...Bc5/5. Nxf7/5...Bxf2/6. Kxf2/6...Nxe4/7. Ke3/7...Qh4/8. g3/8...Nxg3/9. hxg3/9...Qd4
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Traxler Variation rd bd kd rd pd pd pd pd nl pd pd nd pd bl qd kl pl pl pl pl pl rl nl bl ql rl Two Knights Defence
9... Qd4+
Black cannot be allowed to capture the c4 bishop with check so 10. Kf3 is the only move.
Traxler Variation