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...Qd4/10. Kf3/10...O-O/11. Rh4/11...e4
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Traxler Variation rd bd rd kd pd pd pd pd nl pd pd nd bl qd pd rl kl pl pl pl pl pl rl nl bl ql Two Knights Defence
11...e4
After Kg2, Black can finally capture with Qxc4 and the Traxler Counterattack is proved to have merit. Black has an obvious attack on the White king but White can finally start developing their pieces, starting with moving their f7 knight back.
Finally, it should be noted that 12. Rxe4 is a mistake because after 12...Ne5+ 13. Rxe5 Qxc4, White has no way to defend their knight.
Traxler Variation