Passaggi della soluzione:

1. Riga 2 / Colonna 8 → 3 (Hidden Single)
2. Riga 6 / Colonna 6 → 1 (Hidden Single)
3. Riga 8 / Colonna 9 → 1 (Hidden Single)
4. Riga 7 / Colonna 3 → 1 (Hidden Single)
5. Riga 2 / Colonna 5 → 1 (Hidden Single)
6. Riga 5 / Colonna 7 → 1 (Hidden Single)
7. Locked Candidates Type 1 (Pointing): 2 in b3 => r79c9<>2
8. Locked Candidates Type 1 (Pointing): 5 in b3 => r79c7<>5
9. Locked Candidates Type 1 (Pointing): 4 in b5 => r78c4<>4
10. Riga 8 / Colonna 2 → 4 (Hidden Single)
11. Riga 2 / Colonna 9 → 4 (Hidden Single)
12. Riga 3 / Colonna 1 → 4 (Hidden Single)
13. Locked Pair: 6,9 in r79c1 => r15c1,r7c2,r9c3<>9, r5c1,r7c2<>6
14. Riga 5 / Colonna 9 → 6 (Hidden Single)
15. Riga 4 / Colonna 2 → 6 (Hidden Single)
16. Locked Candidates Type 1 (Pointing): 8 in b6 => r4c46<>8
17. Locked Candidates Type 1 (Pointing): 9 in b6 => r789c8<>9
18. Riga 8 / Colonna 8 → 8 (Naked Single)
19. Riga 4 / Colonna 7 → 8 (Hidden Single)
20. Locked Pair: 5,7 in r13c7 => r13c9,r79c7<>7
21. Locked Candidates Type 1 (Pointing): 7 in b6 => r79c8<>7
22. Locked Candidates Type 2 (Claiming): 2 in r2 => r1c45,r3c456<>2
23. Locked Candidates Type 2 (Claiming): 6 in r8 => r7c46,r9c6<>6
24. Locked Candidates Type 2 (Claiming): 9 in r8 => r7c456,r9c56<>9
25. Locked Candidates Type 2 (Claiming): 2 in c5 => r7c46,r9c6<>2
26. Naked Triple: 3,5,8 in r7c46,r9c6 => r79c5<>5, r79c5<>8
27. Hidden Triple: 3,6,7 in r13c4,r3c6 => r13c4,r3c6<>5, r13c4,r3c6<>8, r13c4,r3c6<>9
28. Locked Candidates Type 1 (Pointing): 9 in b2 => r5c5<>9
29. Naked Triple: 3,5,7 in r1c147 => r1c3<>3, r1c5<>5
30. Swordfish: 5 c157 r135 => r3c2,r5c4<>5
31. W-Wing: 9/8 in r1c5,r3c2 connected by 8 in r13c9 => r1c3,r3c5<>9
32. Riga 1 / Colonna 5 → 9 (Hidden Single)
33. W-Wing: 5/8 in r2c2,r9c6 connected by 8 in r7c2,r9c3 => r2c6<>5
34. Locked Candidates Type 2 (Claiming): 5 in c6 => r7c4<>5
35. Hidden Triple: 2,4,5 in r246c4 => r2c4<>8, r46c4<>9
36. Skyscraper: 8 in r2c2,r9c3 (connected by r29c6) => r13c3,r7c2<>8
37. Riga 1 / Colonna 3 → 2 (Naked Single)
38. Riga 7 / Colonna 2 → 7 (Naked Single)
39. Riga 1 / Colonna 9 → 8 (Naked Single)
40. Riga 7 / Colonna 9 → 9 (Naked Single)
41. Riga 9 / Colonna 3 → 8 (Naked Single)
42. Riga 3 / Colonna 9 → 2 (Naked Single)
43. Riga 9 / Colonna 9 → 7 (Full House)
44. Riga 7 / Colonna 1 → 6 (Naked Single)
45. Riga 9 / Colonna 1 → 9 (Full House)
46. Riga 9 / Colonna 6 → 5 (Naked Single)
47. Riga 7 / Colonna 7 → 4 (Naked Single)
48. Riga 9 / Colonna 8 → 2 (Naked Single)
49. Riga 7 / Colonna 5 → 2 (Naked Single)
50. Riga 9 / Colonna 7 → 6 (Naked Single)
51. Riga 7 / Colonna 8 → 5 (Full House)
52. Riga 9 / Colonna 5 → 4 (Full House)
53. Naked Pair: 3,9 in r35c3 => r46c3<>9
54. Bivalue Universal Grave + 1 => r3c4<>6, r3c4<>7
55. Riga 3 / Colonna 4 → 3 (Naked Single)
56. Riga 1 / Colonna 4 → 7 (Naked Single)
57. Riga 3 / Colonna 3 → 9 (Naked Single)
58. Riga 3 / Colonna 6 → 6 (Naked Single)
59. Riga 7 / Colonna 4 → 8 (Naked Single)
60. Riga 7 / Colonna 6 → 3 (Full House)
61. Riga 1 / Colonna 7 → 5 (Naked Single)
62. Riga 1 / Colonna 1 → 3 (Full House)
63. Riga 3 / Colonna 7 → 7 (Full House)
64. Riga 5 / Colonna 1 → 5 (Full House)
65. Riga 3 / Colonna 2 → 8 (Naked Single)
66. Riga 2 / Colonna 2 → 5 (Full House)
67. Riga 6 / Colonna 2 → 9 (Full House)
68. Riga 3 / Colonna 5 → 5 (Full House)
69. Riga 5 / Colonna 5 → 8 (Full House)
70. Riga 5 / Colonna 3 → 3 (Naked Single)
71. Riga 5 / Colonna 4 → 9 (Full House)
72. Riga 8 / Colonna 6 → 9 (Naked Single)
73. Riga 8 / Colonna 4 → 6 (Full House)
74. Riga 2 / Colonna 4 → 2 (Naked Single)
75. Riga 2 / Colonna 6 → 8 (Full House)
76. Riga 4 / Colonna 6 → 2 (Full House)
77. Riga 6 / Colonna 8 → 7 (Naked Single)
78. Riga 4 / Colonna 8 → 9 (Full House)
79. Riga 4 / Colonna 4 → 4 (Naked Single)
80. Riga 4 / Colonna 3 → 7 (Full House)
81. Riga 6 / Colonna 3 → 4 (Full House)
82. Riga 6 / Colonna 4 → 5 (Full House)