Annotated Chess Game 11260500

1. e4 e5 2. f4 Nb8c6 3. Ng1f3 f5 4. exf5 e4 5. Nf3e5 Nc6xe5 6. fxe5 Qd8g5 7. d4 Qg5xf5 8. Bf1c4 Ng8h6 9. Bc1xh6 gxh6 10. Qd1e2 Bf8e7 11. Nb1c3 Be7b4 12. O-O-O Bb4xc3 13. bxc3 d6 14. Rh1f1 Qf5g5 15. Kc1b2

Kb2 played with the idea that eventually a Rb1 move might be needed.

15... Bc8g4 16. Qe2xe4 O-O-O 17. Bc4d5 Bg4xd1

BxR is NOT correct. What is correct is unclear. But even c6 might have been better. An uncommon miscue by Black.

18. Bd5xb7 Kc8b8 19. Qe4c6 dxe5

If instead 19 ... Be2!, 20 Rb1! (followed by Ka1) still wins.

20. Bb7a6 Bd1f3

Probably with the thought that if QxB, e4 would allow an eventual ... Qd5, blocking the mate. But either gxB or RxB works.