Pasos de la solución:

1. Fila 3 / Columna 8 → 1 (Naked Single)
2. Fila 4 / Columna 6 → 7 (Hidden Single)
3. Fila 1 / Columna 3 → 3 (Hidden Single)
4. Fila 1 / Columna 6 → 5 (Naked Single)
5. Fila 1 / Columna 8 → 9 (Naked Single)
6. Fila 9 / Columna 7 → 8 (Hidden Single)
7. Fila 1 / Columna 4 → 7 (Hidden Single)
8. Fila 5 / Columna 6 → 2 (Hidden Single)
9. Fila 7 / Columna 8 → 2 (Hidden Single)
10. Fila 9 / Columna 6 → 9 (Hidden Single)
11. Fila 9 / Columna 2 → 4 (Hidden Single)
12. Fila 5 / Columna 3 → 4 (Hidden Single)
13. Locked Candidates Type 1 (Pointing): 1 in b2 => r8c5<>1
14. Locked Candidates Type 2 (Claiming): 3 in c5 => r6c4<>3
15. Naked Triple: 1,5,6 in r7c12,r9c1 => r8c13<>1, r8c13<>6
16. Locked Candidates Type 2 (Claiming): 1 in r8 => r7c9<>1
17. Hidden Pair: 2,3 in r46c7 => r4c7<>1, r46c7<>5
18. 2-String Kite: 4 in r2c5,r7c9 (connected by r7c6,r8c5) => r2c9<>4
19. 2-String Kite: 6 in r5c8,r8c5 (connected by r8c9,r9c8) => r5c5<>6
20. Turbot Fish: 8 r1c5 =8= r1c2 -8- r5c2 =8= r6c1 => r6c5<>8
21. W-Wing: 8/5 in r2c9,r5c5 connected by 5 in r25c7 => r2c5<>8
22. Continuous Nice Loop: 4/6/8 4= r2c5 =1= r1c5 =8= r3c4 -8- r3c9 -4- r7c9 =4= r7c6 -4- r8c5 =4= r2c5 =1 => r8c9<>4, r2c5<>6, r3c12<>8
23. XY-Chain: 4 4- r2c5 -1- r1c5 -8- r5c5 -5- r5c7 -1- r8c7 -4 => r2c7,r8c5<>4
24. Fila 8 / Columna 5 → 6 (Naked Single)
25. Fila 8 / Columna 9 → 1 (Naked Single)
26. Fila 9 / Columna 4 → 1 (Naked Single)
27. Fila 8 / Columna 7 → 4 (Naked Single)
28. Fila 7 / Columna 4 → 3 (Naked Single)
29. Fila 7 / Columna 6 → 4 (Full House)
30. Fila 3 / Columna 7 → 7 (Naked Single)
31. Fila 2 / Columna 6 → 6 (Naked Single)
32. Fila 3 / Columna 6 → 3 (Full House)
33. Fila 2 / Columna 7 → 5 (Naked Single)
34. Fila 3 / Columna 4 → 8 (Naked Single)
35. Fila 2 / Columna 9 → 8 (Naked Single)
36. Fila 3 / Columna 9 → 4 (Full House)
37. Fila 5 / Columna 7 → 1 (Naked Single)
38. Fila 1 / Columna 5 → 1 (Naked Single)
39. Fila 1 / Columna 2 → 8 (Full House)
40. Fila 2 / Columna 5 → 4 (Full House)
41. Fila 2 / Columna 1 → 7 (Hidden Single)
42. Fila 5 / Columna 5 → 8 (Hidden Single)
43. Fila 6 / Columna 1 → 8 (Hidden Single)
44. Locked Candidates Type 2 (Claiming): 6 in c3 => r4c12,r5c2<>6
45. Skyscraper: 5 in r5c2,r9c1 (connected by r59c8) => r4c1,r7c2<>5
46. XY-Chain: 1 1- r2c2 -9- r5c2 -5- r5c8 -6- r9c8 -5- r9c1 -6- r7c2 -1 => r4c2<>1
47. XY-Chain: 9 9- r5c2 -5- r5c8 -6- r9c8 -5- r9c1 -6- r3c1 -2- r8c1 -9 => r4c1<>9
48. Fila 8 / Columna 1 → 9 (Hidden Single)
49. Fila 8 / Columna 3 → 2 (Full House)
50. Fila 6 / Columna 7 → 2 (Hidden Single)
51. Fila 4 / Columna 7 → 3 (Full House)
52. Fila 4 / Columna 5 → 5 (Naked Single)
53. Fila 6 / Columna 5 → 3 (Full House)
54. Fila 5 / Columna 2 → 5 (Hidden Single)
55. Fila 5 / Columna 8 → 6 (Naked Single)
56. Fila 5 / Columna 4 → 9 (Full House)
57. Fila 9 / Columna 8 → 5 (Full House)
58. Fila 6 / Columna 4 → 6 (Full House)
59. Fila 7 / Columna 9 → 6 (Full House)
60. Fila 9 / Columna 1 → 6 (Full House)
61. Fila 4 / Columna 9 → 9 (Naked Single)
62. Fila 6 / Columna 9 → 5 (Full House)
63. Fila 6 / Columna 3 → 9 (Full House)
64. Fila 7 / Columna 2 → 1 (Naked Single)
65. Fila 7 / Columna 1 → 5 (Full House)
66. Fila 3 / Columna 1 → 2 (Naked Single)
67. Fila 3 / Columna 2 → 6 (Full House)
68. Fila 4 / Columna 1 → 1 (Full House)
69. Fila 4 / Columna 2 → 2 (Naked Single)
70. Fila 2 / Columna 2 → 9 (Full House)
71. Fila 2 / Columna 3 → 1 (Full House)
72. Fila 4 / Columna 3 → 6 (Full House)