Pasos de la solución:

1. Fila 6 / Columna 2 → 8 (Hidden Single)
2. Fila 4 / Columna 7 → 8 (Hidden Single)
3. Fila 2 / Columna 8 → 4 (Hidden Single)
4. Fila 7 / Columna 5 → 4 (Hidden Single)
5. Fila 4 / Columna 4 → 4 (Hidden Single)
6. Fila 4 / Columna 8 → 6 (Hidden Single)
7. Fila 9 / Columna 4 → 3 (Hidden Single)
8. Fila 4 / Columna 6 → 3 (Hidden Single)
9. Fila 5 / Columna 8 → 9 (Hidden Single)
10. Fila 7 / Columna 8 → 3 (Hidden Single)
11. Fila 8 / Columna 4 → 1 (Hidden Single)
12. Fila 4 / Columna 5 → 9 (Hidden Single)
13. Fila 9 / Columna 8 → 1 (Hidden Single)
14. Fila 8 / Columna 5 → 6 (Hidden Single)
15. Fila 3 / Columna 4 → 6 (Hidden Single)
16. Fila 9 / Columna 6 → 9 (Hidden Single)
17. Fila 7 / Columna 3 → 1 (Hidden Single)
18. Locked Candidates Type 1 (Pointing): 5 in b4 => r5c5<>5
19. Locked Candidates Type 2 (Claiming): 2 in r4 => r5c123<>2
20. Locked Candidates Type 2 (Claiming): 7 in r4 => r5c123<>7
21. Fila 5 / Columna 1 → 4 (Naked Single)
22. Fila 1 / Columna 3 → 4 (Hidden Single)
23. Fila 1 / Columna 7 → 3 (Hidden Single)
24. Naked Triple: 2,7,8 in r79c9,r8c8 => r79c7<>7, r9c7<>2
25. X-Wing: 8 r28 c36 => r39c3,r7c6<>8
26. Discontinuous Nice Loop: 2 r1c5 -2- r5c5 -7- r6c4 -5- r1c4 =5= r1c5 => r1c5<>2
27. Naked Triple: 5,7,9 in r1c45,r2c4 => r2c6,r3c5<>7
28. XYZ-Wing: 2/7/8 in r13c1,r3c5 => r3c23<>2
29. Finned X-Wing: 2 c57 r35 fr2c7 => r3c9<>2
30. Multi Colors 1: 2 (r1c1) / (r1c9), (r2c6,r5c5,r6c8,r9c9) / (r3c5,r6c6,r8c8) => r3c1<>2
31. Discontinuous Nice Loop: 2 r2c3 -2- r1c1 =2= r1c9 =9= r1c4 -9- r2c4 =9= r2c3 => r2c3<>2
32. XYZ-Wing: 7/8/9 in r2c34,r3c1 => r2c2<>7
33. Discontinuous Nice Loop: 8 r7c1 -8- r7c9 -7- r8c8 -2- r6c8 =2= r6c6 -2- r2c6 -8- r2c3 =8= r8c3 -8- r7c1 => r7c1<>8
34. Fila 7 / Columna 9 → 8 (Hidden Single)
35. XY-Chain: 7 7- r5c5 -2- r3c5 -8- r3c1 -7- r7c1 -6- r7c7 -5- r7c6 -7 => r6c6,r9c5<>7
36. Sashimi X-Wing: 7 c57 r15 fr2c7 fr3c7 => r1c9<>7
37. XY-Chain: 7 7- r3c1 -8- r3c5 -2- r5c5 -7- r6c4 -5- r6c6 -2- r6c8 -7- r8c8 -2- r9c9 -7 => r3c9,r9c1<>7
38. Locked Candidates Type 1 (Pointing): 7 in b3 => r5c7<>7
39. W-Wing: 2/7 in r4c3,r8c8 connected by 7 in r9c39 => r8c3<>2
40. Continuous Nice Loop: 7 3= r3c2 =1= r2c2 =2= r1c1 -2- r1c9 -9- r3c9 =9= r3c3 =3= r3c2 =1 => r3c23<>7
41. Naked Triple: 1,3,9 in r3c239 => r3c7<>1
42. Discontinuous Nice Loop: 7 r8c3 -7- r8c8 -2- r6c8 =2= r6c6 -2- r2c6 -8- r2c3 =8= r8c3 => r8c3<>7
43. Almost Locked Set XY-Wing: A=r9c157 {2568}, B=r2358c3 {35789}, C=r1c1 {27}, X,Y=2,7, Z=5 => r9c3<>5
44. Locked Candidates Type 1 (Pointing): 5 in b7 => r8c6<>5
45. Naked Pair: 2,7 in r9c39 => r9c1<>2
46. Fila 1 / Columna 1 → 2 (Hidden Single)
47. Fila 1 / Columna 9 → 9 (Naked Single)
48. Fila 2 / Columna 2 → 1 (Naked Single)
49. Fila 3 / Columna 9 → 1 (Naked Single)
50. Fila 3 / Columna 2 → 3 (Naked Single)
51. Fila 3 / Columna 3 → 9 (Naked Single)
52. Fila 5 / Columna 2 → 5 (Naked Single)
53. Fila 5 / Columna 3 → 3 (Naked Single)
54. Fila 2 / Columna 4 → 9 (Hidden Single)
55. Fila 5 / Columna 7 → 1 (Hidden Single)
56. Fila 8 / Columna 3 → 5 (Hidden Single)
57. Fila 8 / Columna 6 → 8 (Hidden Single)
58. Fila 2 / Columna 6 → 2 (Naked Single)
59. Fila 9 / Columna 5 → 5 (Naked Single)
60. Fila 7 / Columna 6 → 7 (Full House)
61. Fila 6 / Columna 6 → 5 (Full House)
62. Fila 2 / Columna 7 → 7 (Naked Single)
63. Fila 2 / Columna 3 → 8 (Full House)
64. Fila 3 / Columna 7 → 2 (Full House)
65. Fila 3 / Columna 1 → 7 (Full House)
66. Fila 3 / Columna 5 → 8 (Full House)
67. Fila 1 / Columna 5 → 7 (Naked Single)
68. Fila 1 / Columna 4 → 5 (Full House)
69. Fila 6 / Columna 4 → 7 (Full House)
70. Fila 5 / Columna 5 → 2 (Full House)
71. Fila 6 / Columna 8 → 2 (Full House)
72. Fila 5 / Columna 9 → 7 (Full House)
73. Fila 8 / Columna 8 → 7 (Full House)
74. Fila 9 / Columna 9 → 2 (Full House)
75. Fila 8 / Columna 2 → 2 (Full House)
76. Fila 4 / Columna 2 → 7 (Full House)
77. Fila 4 / Columna 3 → 2 (Full House)
78. Fila 9 / Columna 3 → 7 (Full House)
79. Fila 9 / Columna 7 → 6 (Naked Single)
80. Fila 7 / Columna 7 → 5 (Full House)
81. Fila 7 / Columna 1 → 6 (Full House)
82. Fila 9 / Columna 1 → 8 (Full House)