🧠🧠 O vs U (Find the Blunder Exercise)

Find the Blunder Exercise: The audio will lead you through a series of moves from the beginning of a game. One player will blunder and the other will not punish them for it. Can you find the blunder and the best punishment?

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PGN for today's exercise:
Adapted from the game Colborne vs Blackburne (Hastings, 1894).

1. e4 e5 2. d4 exd4 3. Qxd4 Nc6 4. Qe3 g6 5. Bd2 Bg7 6. Nc3 Nge7 7. O-O-O O-O 8. f4 d5 9. exd5 Nb4 10. Bc4 Bf5 11. Bb3 Nexd5 12. Nxd5 Nxd5 13. Qf3 c6 14. g4 Be6 15. Ne2 a5 *

And the answer is...
13... Qf6 14. c3 (14. Bc3 Nxc3 15. bxc3 Qe7 with a winning position.) 14... Nb4 15. Bc4 Qa6 16. g4 Qxa2 17. Be3 Bxc3