Pasos de la solución:

1. Fila 3 / Columna 5 → 5 (Hidden Single)
2. Fila 8 / Columna 2 → 5 (Hidden Single)
3. Fila 7 / Columna 9 → 5 (Hidden Single)
4. Fila 3 / Columna 1 → 8 (Hidden Single)
5. Fila 1 / Columna 5 → 8 (Hidden Single)
6. Fila 4 / Columna 4 → 5 (Hidden Single)
7. Fila 5 / Columna 3 → 5 (Hidden Single)
8. Fila 8 / Columna 1 → 1 (Hidden Single)
9. Fila 7 / Columna 7 → 1 (Hidden Single)
10. Fila 9 / Columna 2 → 8 (Hidden Single)
11. Fila 9 / Columna 9 → 6 (Naked Single)
12. Fila 5 / Columna 9 → 4 (Naked Single)
13. Fila 8 / Columna 8 → 8 (Hidden Single)
14. Fila 5 / Columna 4 → 9 (Hidden Single)
15. Fila 4 / Columna 9 → 8 (Hidden Single)
16. Fila 7 / Columna 3 → 6 (Hidden Single)
17. Fila 4 / Columna 7 → 9 (Hidden Single)
18. Fila 5 / Columna 5 → 3 (Hidden Single)
19. Fila 8 / Columna 5 → 2 (Naked Single)
20. Locked Candidates Type 1 (Pointing): 1 in b4 => r12c2<>1
21. Locked Candidates Type 1 (Pointing): 7 in b6 => r2c8<>7
22. Locked Candidates Type 2 (Claiming): 3 in r8 => r7c6<>3
23. Naked Pair: 1,7 in r3c39 => r3c6<>1, r3c6<>7
24. Locked Candidates Type 1 (Pointing): 1 in b2 => r2c3<>1
25. Turbot Fish: 2 r5c1 =2= r5c7 -2- r9c7 =2= r7c8 => r7c1<>2
26. W-Wing: 3/6 in r2c8,r8c4 connected by 6 in r1c47 => r2c4<>3
27. W-Wing: 6/3 in r2c8,r8c6 connected by 3 in r3c67 => r2c6<>6
28. Fila 8 / Columna 6 → 6 (Hidden Single)
29. Fila 8 / Columna 4 → 3 (Full House)
30. Uniqueness Test 1: 1/7 in r1c39,r3c39 => r1c3<>1, r1c3<>7
31. Fila 1 / Columna 3 → 2 (Naked Single)
32. Fila 1 / Columna 9 → 1 (Hidden Single)
33. Fila 3 / Columna 9 → 7 (Full House)
34. Fila 3 / Columna 3 → 1 (Naked Single)
35. Naked Pair: 7,9 in r9c35 => r9c1<>7
36. X-Wing: 2 r59 c17 => r4c1<>2
37. XY-Chain: 4 4- r6c4 -7- r6c8 -2- r7c8 -3- r7c1 -7- r7c6 -4 => r46c6<>4
38. 2-String Kite: 4 in r1c1,r6c4 (connected by r4c1,r6c2) => r1c4<>4
39. XY-Chain: 3 3- r3c6 -4- r7c6 -7- r7c1 -3- r7c8 -2- r9c7 -3 => r3c7<>3
40. Fila 3 / Columna 7 → 4 (Naked Single)
41. Fila 3 / Columna 6 → 3 (Full House)
42. Locked Candidates Type 1 (Pointing): 4 in b2 => r2c2<>4
43. XY-Chain: 7 7- r1c4 -6- r1c7 -3- r9c7 -2- r9c1 -3- r7c1 -7- r9c3 -9- r2c3 -7 => r1c1,r2c456<>7
44. Fila 1 / Columna 4 → 7 (Hidden Single)
45. Fila 6 / Columna 4 → 4 (Naked Single)
46. Fila 2 / Columna 4 → 6 (Full House)
47. Fila 2 / Columna 8 → 3 (Naked Single)
48. Fila 1 / Columna 7 → 6 (Full House)
49. Fila 2 / Columna 2 → 9 (Naked Single)
50. Fila 7 / Columna 8 → 2 (Naked Single)
51. Fila 9 / Columna 7 → 3 (Full House)
52. Fila 5 / Columna 7 → 2 (Full House)
53. Fila 5 / Columna 1 → 6 (Full House)
54. Fila 2 / Columna 3 → 7 (Naked Single)
55. Fila 9 / Columna 3 → 9 (Full House)
56. Fila 6 / Columna 8 → 7 (Naked Single)
57. Fila 4 / Columna 8 → 6 (Full House)
58. Fila 7 / Columna 2 → 3 (Naked Single)
59. Fila 9 / Columna 1 → 2 (Naked Single)
60. Fila 9 / Columna 5 → 7 (Full House)
61. Fila 7 / Columna 1 → 7 (Full House)
62. Fila 4 / Columna 1 → 4 (Naked Single)
63. Fila 1 / Columna 1 → 3 (Full House)
64. Fila 1 / Columna 2 → 4 (Full House)
65. Fila 4 / Columna 5 → 1 (Naked Single)
66. Fila 7 / Columna 6 → 4 (Naked Single)
67. Fila 7 / Columna 5 → 9 (Full House)
68. Fila 2 / Columna 5 → 4 (Full House)
69. Fila 2 / Columna 6 → 1 (Full House)
70. Fila 4 / Columna 2 → 2 (Naked Single)
71. Fila 4 / Columna 6 → 7 (Full House)
72. Fila 6 / Columna 6 → 2 (Full House)
73. Fila 6 / Columna 2 → 1 (Full House)