Checkmate by 2nd Black Queen
I don't very often end up with two Queens on the board, but when I do I like it!
It was my second Black Queen who checkmated the White King. As you can see, my first Black Queen remains down on her home rank. While White's attention was focused on his attack over on the left side of the board (as seen from Black's perspective) I was able to slip a pawn down on the other side of the board and promote it to my second Queen who would go on to checkmate the White King in short order.
Our board at game's end is shown above, and our full move record is below:
1. b4 b5 2. Nc3 e5 3. Nxb5 a6 4. Nc3 Bxb4 5. a3 Ba5 6. Na4 Nf6 7. Nc5 O-O 8. c3 d6 9. Na4 Nc6 10. Qc2 g6 11. d4 exd4 12. e4 Kg7 13. e5 Nxe5 14. Qd2 dxc3 15. Qh6+ Kg8 16. Bg5 Neg4 17. Qh4 Re8+ 18. Be2 c2+ 19. Kf1 Bb7 20. Bxg4 Bc8 21. Bf3 Rb8 22. Bxf6 Rb1+ 23. Rxb1 cxb1=Q+ 24. Bd1 Qxd1# 0-1
And the adventure continues.