Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Bb5/3...a6/4. Ba4/4...Nf6/5. O-O/5...Be7/6. Re1/6...b5/7. Bb3/7...O-O/8. c3/8...d5/9. exd5/9...Nxd5/10. Nxe5/10...Nxe5/11. Rxe5/11...c6/12. d4/12...Bd6/13. Re1/13...Qh4/14. g3/14...Qh3/15. Re4
< Chess Opening Theory | 1. e4 | 1...e5 | 2. Nf3 | 2...Nc6 | 3. Bb5 | 3...a6 | 4. Ba4 | 4...Nf6 | 5. O-O | 5...Be7 | 6. Re1 | 6...b5 | 7. Bb3 | 7...O-O | 8. c3 | 8...d5 | 9. exd5 | 9...Nxd5 | 10. Nxe5 | 10...Nxe5 | 11. Rxe5 | 11...c6 | 12. d4 | 12...Bd6 | 13. Re1 | 13...Qh4 | 14. g3 | 14...Qh3
The surprising 15...g5! is the only move. Black prevents Rh4 by direct means. White can't simply reply with Bxg5 because ...Qf5 would fork the two loose White pieces.