Passaggi della soluzione:

1. Riga 6 / Colonna 3 → 1 (Hidden Single)
2. Riga 5 / Colonna 1 → 3 (Hidden Single)
3. Locked Candidates Type 1 (Pointing): 5 in b1 => r89c3<>5
4. Locked Candidates Type 1 (Pointing): 6 in b1 => r89c3<>6
5. Locked Candidates Type 1 (Pointing): 7 in b3 => r3c456<>7
6. Locked Candidates Type 1 (Pointing): 2 in b4 => r4c5689<>2
7. Locked Candidates Type 1 (Pointing): 7 in b4 => r4c5689<>7
8. Locked Candidates Type 1 (Pointing): 8 in b4 => r4c5689<>8
9. Naked Pair: 4,9 in r4c58 => r4c6<>9, r4c9<>4
10. Naked Pair: 2,8 in r47c1 => r189c1<>2, r19c1<>8
11. Riga 1 / Colonna 1 → 4 (Naked Single)
12. Hidden Pair: 5,6 in r23c3 => r23c3<>3, r23c3<>8, r23c3<>9, r3c3<>2
13. Locked Candidates Type 1 (Pointing): 9 in b1 => r789c2<>9
14. 2-String Kite: 4 in r3c4,r4c8 (connected by r4c5,r6c4) => r3c8<>4
15. Continuous Nice Loop: 3/5/6/7/9 5= r3c4 =4= r6c4 =6= r9c4 -6- r9c1 -5- r9c7 =5= r5c7 -5- r5c4 =5= r3c4 =4 => r36c4<>3, r5c69,r9c9<>5, r9c6<>6, r6c4<>7, r3c4<>9
16. W-Wing: 6/5 in r4c6,r8c1 connected by 5 in r48c9 => r8c6<>6
17. Riga 8 / Colonna 1 → 6 (Hidden Single)
18. Riga 9 / Colonna 1 → 5 (Naked Single)
19. Riga 9 / Colonna 4 → 6 (Hidden Single)
20. Riga 6 / Colonna 4 → 4 (Naked Single)
21. Riga 3 / Colonna 4 → 5 (Naked Single)
22. Riga 4 / Colonna 5 → 9 (Naked Single)
23. Riga 3 / Colonna 3 → 6 (Naked Single)
24. Riga 4 / Colonna 8 → 4 (Naked Single)
25. Riga 5 / Colonna 4 → 7 (Naked Single)
26. Riga 2 / Colonna 3 → 5 (Naked Single)
27. Riga 1 / Colonna 4 → 3 (Naked Single)
28. Riga 7 / Colonna 4 → 9 (Full House)
29. Riga 8 / Colonna 9 → 5 (Hidden Single)
30. Riga 4 / Colonna 9 → 6 (Naked Single)
31. Riga 4 / Colonna 6 → 5 (Naked Single)
32. Riga 5 / Colonna 7 → 5 (Hidden Single)
33. Riga 1 / Colonna 6 → 7 (Hidden Single)
34. Riga 9 / Colonna 5 → 7 (Hidden Single)
35. Riga 8 / Colonna 2 → 4 (Hidden Single)
36. Riga 2 / Colonna 7 → 6 (Hidden Single)
37. Riga 6 / Colonna 6 → 6 (Hidden Single)
38. Riga 5 / Colonna 8 → 9 (Hidden Single)
39. Riga 9 / Colonna 7 → 9 (Hidden Single)
40. Riga 1 / Colonna 7 → 1 (Hidden Single)
41. Riga 6 / Colonna 5 → 3 (Hidden Single)
42. Riga 8 / Colonna 3 → 9 (Hidden Single)
43. Riga 5 / Colonna 9 → 1 (Hidden Single)
44. Riga 9 / Colonna 9 → 4 (Hidden Single)
45. Riga 3 / Colonna 7 → 4 (Hidden Single)
46. Riga 3 / Colonna 5 → 8 (Naked Single)
47. Riga 3 / Colonna 6 → 9 (Naked Single)
48. Riga 5 / Colonna 5 → 2 (Naked Single)
49. Riga 5 / Colonna 6 → 8 (Full House)
50. Riga 2 / Colonna 6 → 1 (Naked Single)
51. Riga 2 / Colonna 5 → 4 (Full House)
52. Riga 8 / Colonna 5 → 1 (Full House)
53. Riga 7 / Colonna 2 → 1 (Hidden Single)
54. Riga 2 / Colonna 2 → 9 (Hidden Single)
55. Riga 9 / Colonna 8 → 1 (Hidden Single)
56. Riga 7 / Colonna 3 → 7 (Hidden Single)
57. Riga 4 / Colonna 2 → 7 (Hidden Single)
58. Riga 3 / Colonna 2 → 3 (Hidden Single)
59. Riga 7 / Colonna 9 → 3 (Hidden Single)
60. Riga 2 / Colonna 9 → 8 (Naked Single)
61. Riga 2 / Colonna 8 → 3 (Full House)
62. Riga 8 / Colonna 8 → 2 (Naked Single)
63. Riga 7 / Colonna 7 → 8 (Full House)
64. Riga 8 / Colonna 6 → 3 (Full House)
65. Riga 6 / Colonna 7 → 2 (Full House)
66. Riga 7 / Colonna 1 → 2 (Full House)
67. Riga 9 / Colonna 6 → 2 (Full House)
68. Riga 4 / Colonna 1 → 8 (Full House)
69. Riga 4 / Colonna 3 → 2 (Full House)
70. Riga 3 / Colonna 8 → 7 (Naked Single)
71. Riga 3 / Colonna 9 → 2 (Full House)
72. Riga 6 / Colonna 9 → 7 (Full House)
73. Riga 6 / Colonna 8 → 8 (Full House)
74. Riga 9 / Colonna 2 → 8 (Naked Single)
75. Riga 1 / Colonna 2 → 2 (Full House)
76. Riga 1 / Colonna 3 → 8 (Full House)
77. Riga 9 / Colonna 3 → 3 (Full House)