Mate in 51

1. b7!! g3! 2. b8=Q!! g2! 3. Qb7!! Kg1! 4. Qf7!! Kh1! 5. Qh7+! Kg1! 6. Qf5! Kh1! 7. Qe4! Bg4! 8. Qh7+!! Kg1! 9. Qh6!! Kf2! 10. Qh4+ Kf1! 11. Qf6+!! Kg1! 12. Qf4! Kh1! 13. Qh6+!! Kg1! 14. Kc7! Kf2! 15. Qh4+ Kf1! 16. Qf6+!! Kg1! 17. Qf4! Kh1! 18. Qh6+!! Kg1! 19. Kb6! Kf2! 20. Qh4+!! Kf1! 21. Qf6+!! Kg1! 22. Qf4! Bh3! 23. Qg3!! Bc8! 24. Qh4! Kf1! 25. Qf4+! Ke1 26. Qe3+ Kf1! 27. Qf3+! Kg1! 28. Kc7! Kh2! 29. Qf4+!! Kh1! 30. Qh4+ Kg1! 31. Kxc8! Kf1 32. Qf4+! Ke1 33. Qe3+ Kf1! 34. Qf3+! Kg1! 35. Kb7 Kh2! 36. Qf2 Kh1! 37. Qh4+! Kg1 38. Kc6! Kf1 39. Qf4+! Ke1 40. Qe3+ Kf1! 41. Qf3+! Kg1! 42. Kd5! Kh2! 43. Qf2 Kh1! 44. Qh4+! Kg1 45. Ke4! Kf1 46. Qh3! Kf2! 47. Qh2 Kf1! 48. Kf3! g1=N+ 49. Ke3 Nh3! 50. Qg3! Ng1 51. Qf2#! Mate 1-0

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