Pasos de la solución:

1. Fila 5 / Columna 2 → 9 (Hidden Single)
2. Fila 7 / Columna 1 → 2 (Hidden Single)
3. Fila 8 / Columna 5 → 6 (Hidden Single)
4. Fila 9 / Columna 8 → 2 (Hidden Single)
5. Fila 7 / Columna 6 → 9 (Hidden Single)
6. Fila 5 / Columna 9 → 2 (Hidden Single)
7. Fila 6 / Columna 9 → 6 (Hidden Single)
8. Fila 5 / Columna 1 → 6 (Hidden Single)
9. Fila 4 / Columna 9 → 3 (Hidden Single)
10. Fila 8 / Columna 9 → 9 (Hidden Single)
11. Locked Candidates Type 1 (Pointing): 3 in b4 => r8c3<>3
12. Fila 8 / Columna 2 → 3 (Hidden Single)
13. Locked Candidates Type 1 (Pointing): 8 in b4 => r12c1<>8
14. Locked Candidates Type 1 (Pointing): 1 in b7 => r8c78<>1
15. Fila 6 / Columna 7 → 1 (Hidden Single)
16. Fila 7 / Columna 8 → 1 (Hidden Single)
17. Locked Candidates Type 1 (Pointing): 7 in b9 => r8c13<>7
18. Locked Candidates Type 1 (Pointing): 7 in b7 => r3c2<>7
19. Locked Candidates Type 1 (Pointing): 7 in b1 => r2c5<>7
20. Hidden Pair: 2,8 in r2c57 => r2c5<>4, r2c57<>5
21. W-Wing: 4/7 in r4c3,r8c8 connected by 7 in r5c38 => r8c3<>4
22. 2-String Kite: 4 in r2c9,r8c1 (connected by r7c9,r8c8) => r2c1<>4
23. Uniqueness Test 4: 2/8 in r1c57,r2c57 => r1c57<>8
24. Discontinuous Nice Loop: 4 r2c3 -4- r2c9 -5- r7c9 =5= r8c7 =7= r4c7 -7- r4c3 -4- r2c3 => r2c3<>4
25. Locked Candidates Type 2 (Claiming): 4 in c3 => r46c1<>4
26. Simple Colors Trap: 4 (r1c1,r2c9,r8c8) / (r2c6,r7c9,r8c1) => r1c456<>4
27. Discontinuous Nice Loop: 5 r1c1 -5- r6c1 -8- r4c1 -7- r4c7 =7= r8c7 -7- r8c8 -4- r8c1 =4= r1c1 => r1c1<>5
28. Empty Rectangle: 5 in b1 (r27c9) => r7c2<>5
29. Discontinuous Nice Loop: 8 r4c5 -8- r4c1 =8= r6c1 -8- r6c8 -9- r6c5 =9= r4c5 => r4c5<>8
30. Grouped AIC: 4 4- r2c9 =4= r2c6 =1= r1c46 -1- r1c1 -4- r8c1 =4= r8c8 -4 => r13c8,r7c9<>4
31. Fila 7 / Columna 9 → 5 (Naked Single)
32. Fila 2 / Columna 9 → 4 (Full House)
33. Fila 8 / Columna 7 → 7 (Naked Single)
34. Fila 8 / Columna 8 → 4 (Full House)
35. Fila 5 / Columna 8 → 7 (Hidden Single)
36. Fila 1 / Columna 1 → 4 (Hidden Single)
37. Fila 5 / Columna 4 → 8 (Hidden Single)
38. Locked Pair: 5,8 in r13c2 => r2c13,r9c2<>5
39. Fila 2 / Columna 6 → 5 (Hidden Single)
40. Fila 5 / Columna 6 → 3 (Naked Single)
41. Fila 5 / Columna 3 → 5 (Full House)
42. Fila 6 / Columna 1 → 8 (Naked Single)
43. Fila 8 / Columna 3 → 1 (Naked Single)
44. Fila 8 / Columna 1 → 5 (Full House)
45. Fila 4 / Columna 1 → 7 (Naked Single)
46. Fila 2 / Columna 1 → 1 (Full House)
47. Fila 6 / Columna 8 → 9 (Naked Single)
48. Fila 4 / Columna 7 → 8 (Full House)
49. Fila 2 / Columna 3 → 7 (Naked Single)
50. Fila 4 / Columna 3 → 4 (Naked Single)
51. Fila 4 / Columna 5 → 9 (Full House)
52. Fila 6 / Columna 3 → 3 (Full House)
53. Fila 2 / Columna 7 → 2 (Naked Single)
54. Fila 2 / Columna 5 → 8 (Full House)
55. Fila 1 / Columna 7 → 5 (Naked Single)
56. Fila 3 / Columna 7 → 9 (Full House)
57. Fila 1 / Columna 2 → 8 (Naked Single)
58. Fila 3 / Columna 2 → 5 (Full House)
59. Fila 1 / Columna 8 → 6 (Naked Single)
60. Fila 3 / Columna 8 → 8 (Full House)
61. Fila 1 / Columna 6 → 1 (Naked Single)
62. Fila 1 / Columna 4 → 3 (Naked Single)
63. Fila 1 / Columna 5 → 2 (Full House)
64. Fila 9 / Columna 6 → 4 (Naked Single)
65. Fila 3 / Columna 6 → 6 (Full House)
66. Fila 7 / Columna 4 → 7 (Naked Single)
67. Fila 9 / Columna 2 → 7 (Naked Single)
68. Fila 7 / Columna 2 → 4 (Full House)
69. Fila 7 / Columna 5 → 3 (Full House)
70. Fila 3 / Columna 4 → 4 (Naked Single)
71. Fila 3 / Columna 5 → 7 (Full House)
72. Fila 9 / Columna 5 → 5 (Naked Single)
73. Fila 6 / Columna 5 → 4 (Full House)
74. Fila 6 / Columna 4 → 5 (Full House)
75. Fila 9 / Columna 4 → 1 (Full House)