Pasos de la solución:

1. Fila 3 / Columna 3 → 5 (Hidden Single)
2. Fila 1 / Columna 6 → 5 (Hidden Single)
3. Fila 6 / Columna 4 → 5 (Hidden Single)
4. Fila 8 / Columna 1 → 1 (Hidden Single)
5. Fila 9 / Columna 2 → 5 (Hidden Single)
6. Fila 7 / Columna 7 → 5 (Hidden Single)
7. Fila 5 / Columna 8 → 5 (Hidden Single)
8. Fila 8 / Columna 2 → 7 (Hidden Single)
9. Fila 8 / Columna 7 → 3 (Naked Single)
10. Locked Candidates Type 1 (Pointing): 1 in b6 => r13c9<>1
11. Locked Candidates Type 1 (Pointing): 9 in b7 => r7c45<>9
12. Locked Candidates Type 1 (Pointing): 2 in b8 => r456c5<>2
13. Naked Triple: 4,6,9 in r78c4,r8c6 => r79c5,r9c4<>4, r9c4<>6
14. Fila 9 / Columna 4 → 3 (Naked Single)
15. Locked Candidates Type 1 (Pointing): 4 in b8 => r2c4<>4
16. Hidden Pair: 1,3 in r12c3 => r12c3<>4, r12c3<>9, r2c3<>2
17. Naked Triple: 1,3,9 in r2c346 => r2c27<>9, r2c7<>1, r2c8<>3
18. Locked Candidates Type 2 (Claiming): 9 in r2 => r13c5<>9
19. Locked Candidates Type 2 (Claiming): 9 in c5 => r4c46,r6c6<>9
20. Fila 6 / Columna 6 → 2 (Naked Single)
21. Turbot Fish: 2 r2c2 =2= r4c2 -2- r4c8 =2= r5c7 => r2c7<>2
22. Fila 2 / Columna 7 → 8 (Naked Single)
23. Fila 9 / Columna 7 → 7 (Naked Single)
24. Fila 9 / Columna 5 → 2 (Naked Single)
25. Fila 7 / Columna 5 → 7 (Naked Single)
26. Fila 9 / Columna 9 → 8 (Hidden Single)
27. Locked Candidates Type 2 (Claiming): 4 in r9 => r7c13<>4
28. Locked Candidates Type 2 (Claiming): 6 in r9 => r7c13<>6
29. Hidden Pair: 6,7 in r1c89 => r1c89<>3, r1c89<>4, r1c9<>9
30. Locked Candidates Type 1 (Pointing): 3 in b3 => r3c5<>3
31. X-Wing: 2 r24 c28 => r3c8<>2
32. W-Wing: 9/2 in r5c7,r7c1 connected by 2 in r3c17 => r5c1<>9
33. Continuous Nice Loop: 1/4/9 7= r6c9 =1= r6c5 -1- r3c5 -4- r3c9 =4= r7c9 =6= r1c9 =7= r6c9 =1 => r14c5<>1, r3c18<>4, r6c9<>9
34. Fila 3 / Columna 8 → 3 (Naked Single)
35. Naked Pair: 2,9 in r37c1 => r1c1<>9, r5c1<>2
36. W-Wing: 2/9 in r3c1,r5c7 connected by 9 in r1c27 => r3c7<>2
37. Fila 3 / Columna 1 → 2 (Hidden Single)
38. Fila 2 / Columna 2 → 4 (Naked Single)
39. Fila 7 / Columna 1 → 9 (Naked Single)
40. Fila 1 / Columna 1 → 8 (Naked Single)
41. Fila 2 / Columna 8 → 2 (Naked Single)
42. Fila 7 / Columna 3 → 2 (Naked Single)
43. Fila 1 / Columna 2 → 9 (Naked Single)
44. Fila 5 / Columna 1 → 6 (Naked Single)
45. Fila 9 / Columna 1 → 4 (Full House)
46. Fila 9 / Columna 3 → 6 (Full House)
47. Fila 4 / Columna 8 → 8 (Naked Single)
48. Fila 1 / Columna 7 → 1 (Naked Single)
49. Fila 6 / Columna 2 → 8 (Naked Single)
50. Fila 4 / Columna 2 → 2 (Full House)
51. Fila 5 / Columna 3 → 9 (Naked Single)
52. Fila 6 / Columna 3 → 4 (Full House)
53. Fila 6 / Columna 8 → 7 (Naked Single)
54. Fila 1 / Columna 3 → 3 (Naked Single)
55. Fila 2 / Columna 3 → 1 (Full House)
56. Fila 3 / Columna 7 → 9 (Naked Single)
57. Fila 5 / Columna 7 → 2 (Full House)
58. Fila 5 / Columna 9 → 3 (Naked Single)
59. Fila 5 / Columna 5 → 8 (Full House)
60. Fila 1 / Columna 8 → 6 (Naked Single)
61. Fila 8 / Columna 8 → 4 (Full House)
62. Fila 7 / Columna 9 → 6 (Full House)
63. Fila 7 / Columna 4 → 4 (Full House)
64. Fila 6 / Columna 9 → 1 (Naked Single)
65. Fila 4 / Columna 9 → 9 (Full House)
66. Fila 6 / Columna 5 → 9 (Full House)
67. Fila 1 / Columna 5 → 4 (Naked Single)
68. Fila 1 / Columna 9 → 7 (Full House)
69. Fila 3 / Columna 9 → 4 (Full House)
70. Fila 3 / Columna 5 → 1 (Full House)
71. Fila 4 / Columna 5 → 3 (Full House)
72. Fila 2 / Columna 4 → 9 (Naked Single)
73. Fila 2 / Columna 6 → 3 (Full House)
74. Fila 4 / Columna 6 → 6 (Naked Single)
75. Fila 4 / Columna 4 → 1 (Full House)
76. Fila 8 / Columna 4 → 6 (Full House)
77. Fila 8 / Columna 6 → 9 (Full House)