Pasos de la solución:

1. Fila 1 / Columna 1 → 3 (Hidden Single)
2. Fila 3 / Columna 5 → 1 (Hidden Single)
3. Fila 7 / Columna 3 → 3 (Hidden Single)
4. Fila 9 / Columna 6 → 3 (Hidden Single)
5. Fila 4 / Columna 5 → 3 (Hidden Single)
6. Fila 5 / Columna 7 → 3 (Hidden Single)
7. Fila 3 / Columna 9 → 3 (Hidden Single)
8. Locked Candidates Type 1 (Pointing): 6 in b1 => r789c2<>6
9. Locked Candidates Type 1 (Pointing): 7 in b2 => r1c89<>7
10. Locked Candidates Type 1 (Pointing): 7 in b5 => r5c8<>7
11. Locked Candidates Type 1 (Pointing): 4 in b8 => r13c4<>4
12. 2-String Kite: 8 in r3c7,r8c5 (connected by r2c5,r3c4) => r8c7<>8
13. Locked Candidates Type 1 (Pointing): 8 in b9 => r2c9<>8
14. Empty Rectangle: 6 in b7 (r68c5) => r6c1<>6
15. AIC: 6 6- r6c5 =6= r8c5 =8= r2c5 -8- r2c7 =8= r3c7 =6= r8c7 -6- r9c8 =6= r9c4 -6 => r4c4,r8c5<>6
16. Fila 6 / Columna 5 → 6 (Hidden Single)
17. Naked Triple: 2,5,9 in r4c467 => r4c19<>2, r4c139<>5, r4c39<>9
18. Fila 6 / Columna 9 → 9 (Hidden Single)
19. Locked Candidates Type 1 (Pointing): 9 in b4 => r5c46<>9
20. Naked Pair: 4,5 in r26c3 => r48c3<>4, r58c3<>5
21. 2-String Kite: 4 in r2c3,r4c9 (connected by r4c1,r6c3) => r2c9<>4
22. Locked Candidates Type 2 (Claiming): 4 in r2 => r13c2<>4
23. Locked Candidates Type 2 (Claiming): 4 in c2 => r8c1<>4
24. Continuous Nice Loop: 2/5/6/7 7= r6c8 =4= r4c9 -4- r4c1 -6- r7c1 -7- r7c8 =7= r6c8 =4 => r6c8<>2, r6c8<>5, r8c1<>6, r7c9<>7
25. XY-Chain: 5 5- r6c3 -4- r4c1 -6- r7c1 -7- r8c1 -5 => r6c1<>5
26. Discontinuous Nice Loop: 2/5 r2c9 =7= r2c7 =8= r3c7 =6= r8c7 -6- r8c3 =6= r7c1 =7= r7c8 -7- r8c9 =7= r2c9 => r2c9<>2, r2c9<>5
27. Fila 2 / Columna 9 → 7 (Naked Single)
28. Discontinuous Nice Loop: 2/5/6 r8c7 =7= r6c7 -7- r6c8 -4- r4c9 -1- r7c9 =1= r7c8 =7= r8c7 => r8c7<>2, r8c7<>5, r8c7<>6
29. Fila 8 / Columna 7 → 7 (Naked Single)
30. Fila 8 / Columna 1 → 5 (Naked Single)
31. Fila 3 / Columna 7 → 6 (Hidden Single)
32. Fila 6 / Columna 8 → 7 (Hidden Single)
33. Fila 7 / Columna 1 → 7 (Hidden Single)
34. Fila 1 / Columna 2 → 6 (Hidden Single)
35. Fila 3 / Columna 4 → 8 (Hidden Single)
36. Fila 2 / Columna 5 → 2 (Naked Single)
37. Fila 1 / Columna 5 → 9 (Naked Single)
38. Fila 8 / Columna 5 → 8 (Full House)
39. Fila 2 / Columna 1 → 4 (Naked Single)
40. Fila 8 / Columna 9 → 2 (Naked Single)
41. Fila 2 / Columna 3 → 5 (Naked Single)
42. Fila 2 / Columna 7 → 8 (Full House)
43. Fila 3 / Columna 2 → 2 (Full House)
44. Fila 4 / Columna 1 → 6 (Naked Single)
45. Fila 6 / Columna 1 → 2 (Full House)
46. Fila 6 / Columna 3 → 4 (Naked Single)
47. Fila 6 / Columna 7 → 5 (Full House)
48. Fila 4 / Columna 7 → 2 (Full House)
49. Fila 4 / Columna 3 → 1 (Naked Single)
50. Fila 5 / Columna 8 → 1 (Naked Single)
51. Fila 4 / Columna 9 → 4 (Full House)
52. Fila 5 / Columna 3 → 9 (Naked Single)
53. Fila 5 / Columna 2 → 5 (Full House)
54. Fila 8 / Columna 3 → 6 (Full House)
55. Fila 7 / Columna 8 → 6 (Naked Single)
56. Fila 1 / Columna 9 → 5 (Naked Single)
57. Fila 9 / Columna 8 → 5 (Naked Single)
58. Fila 1 / Columna 4 → 7 (Naked Single)
59. Fila 3 / Columna 8 → 4 (Naked Single)
60. Fila 1 / Columna 8 → 2 (Full House)
61. Fila 1 / Columna 6 → 4 (Full House)
62. Fila 3 / Columna 6 → 5 (Full House)
63. Fila 9 / Columna 9 → 8 (Naked Single)
64. Fila 7 / Columna 9 → 1 (Full House)
65. Fila 5 / Columna 4 → 2 (Naked Single)
66. Fila 5 / Columna 6 → 7 (Full House)
67. Fila 4 / Columna 6 → 9 (Naked Single)
68. Fila 4 / Columna 4 → 5 (Full House)
69. Fila 7 / Columna 6 → 2 (Full House)
70. Fila 9 / Columna 2 → 4 (Naked Single)
71. Fila 9 / Columna 4 → 6 (Full House)
72. Fila 7 / Columna 4 → 9 (Naked Single)
73. Fila 7 / Columna 2 → 8 (Full House)
74. Fila 8 / Columna 2 → 9 (Full House)
75. Fila 8 / Columna 4 → 4 (Full House)