🧠🧠🧠 Slipping in (Opening Exercise)

Opening Exercise: The audio will lead you through a series of moves from the beginning of a game. At a certain point, one player will make a mistake and it’ll be your job to find the move to punish it.

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PGN for today's exercise:

1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ 4. Nc3 b6 5. Bg5 Bb7 6. a3 Bxc3+ 7. bxc3 h6 8. Bh4 d6 9. e3 Nbd7 10. Bd3 g5 11. Bg3 Ne4 12. Qc2 f5 13. O-O Qf6 14. Nd2 Nxd2 15. Qxd2 h5 16. h3 h4 17. Bh2 g4 18. hxg4 h3 19. gxh3 Rxh3 20. f4 Qh4 21. Rf2 Nf6 22. gxf5 Ng4 23. Rff1 { Black to move. Checkmate in two moves. } *

And the answer is...
23... Rg3+ (23... Qg3+ 24. Bxg3 Rh1#) 24. Bxg3 Qh1#