Passaggi della soluzione:

1. Riga 2 / Colonna 4 → 5 (Hidden Single)
2. Riga 3 / Colonna 2 → 5 (Hidden Single)
3. Locked Candidates Type 1 (Pointing): 8 in b4 => r6c79<>8
4. Riga 6 / Colonna 9 → 7 (Naked Single)
5. Locked Candidates Type 2 (Claiming): 6 in r9 => r7c46,r8c5<>6
6. Locked Candidates Type 2 (Claiming): 3 in c2 => r78c1,r8c3<>3
7. Locked Candidates Type 2 (Claiming): 3 in r8 => r7c78,r9c8<>3
8. Locked Candidates Type 2 (Claiming): 6 in c5 => r1c46,r3c46<>6
9. Locked Candidates Type 2 (Claiming): 8 in c9 => r7c78,r8c78,r9c8<>8
10. Riga 9 / Colonna 8 → 1 (Naked Single)
11. Riga 7 / Colonna 8 → 7 (Naked Single)
12. Riga 9 / Colonna 2 → 3 (Naked Single)
13. Riga 7 / Colonna 7 → 6 (Naked Single)
14. Riga 9 / Colonna 4 → 6 (Naked Single)
15. Riga 9 / Colonna 6 → 8 (Full House)
16. Riga 7 / Colonna 9 → 8 (Naked Single)
17. Riga 8 / Colonna 5 → 1 (Naked Single)
18. Riga 7 / Colonna 6 → 4 (Naked Single)
19. Riga 7 / Colonna 4 → 3 (Full House)
20. Riga 2 / Colonna 9 → 6 (Hidden Single)
21. Riga 5 / Colonna 6 → 6 (Hidden Single)
22. Locked Candidates Type 1 (Pointing): 1 in b2 => r1c123<>1
23. Naked Triple: 4,7,9 in r246c5 => r13c5<>4, r13c5<>7, r13c5<>9
24. Locked Candidates Type 1 (Pointing): 4 in b2 => r6c4<>4
25. Riga 6 / Colonna 4 → 1 (Naked Single)
26. Riga 1 / Colonna 6 → 1 (Hidden Single)
27. Naked Triple: 2,8,9 in r135c8 => r48c8<>2
28. W-Wing: 2/7 in r2c7,r5c4 connected by 7 in r24c5 => r5c7<>2
29. 2-String Kite: 2 in r3c6,r5c8 (connected by r4c6,r5c4) => r3c8<>2
30. XY-Wing: 7/9/2 in r2c57,r3c6 => r3c7<>2
31. Sue de Coq: r4c13 - {1379} (r4c689 - {2359}, r5c2 - {17}) => r4c5<>9, r4c7<>2, r4c7<>3
32. XY-Chain: 9 9- r3c6 -2- r4c6 -9- r6c5 -4- r4c5 -7- r5c4 -2- r5c8 -8- r3c8 -9 => r3c13<>9
33. XY-Chain: 8 8- r3c7 -7- r2c7 -2- r8c7 -3- r6c7 -4- r6c5 -9- r4c6 -2- r3c6 -9- r3c8 -8 => r1c8,r3c5<>8
34. Riga 3 / Colonna 5 → 6 (Naked Single)
35. Riga 1 / Colonna 5 → 8 (Naked Single)
36. XY-Wing: 2/9/7 in r1c28,r2c7 => r2c3<>7
37. W-Wing: 1/9 in r2c3,r7c1 connected by 9 in r17c2 => r2c1<>1
38. Riga 2 / Colonna 3 → 1 (Hidden Single)
39. 2-String Kite: 9 in r2c1,r4c6 (connected by r2c5,r3c6) => r4c1<>9
40. XY-Wing: 1/4/3 in r4c17,r6c7 => r4c8,r6c13<>3
41. Riga 4 / Colonna 8 → 5 (Naked Single)
42. Riga 4 / Colonna 9 → 2 (Naked Single)
43. Riga 8 / Colonna 9 → 5 (Full House)
44. Riga 8 / Colonna 8 → 3 (Naked Single)
45. Riga 8 / Colonna 7 → 2 (Full House)
46. Riga 4 / Colonna 6 → 9 (Naked Single)
47. Riga 3 / Colonna 6 → 2 (Full House)
48. Riga 5 / Colonna 8 → 8 (Naked Single)
49. Riga 2 / Colonna 7 → 7 (Naked Single)
50. Riga 6 / Colonna 5 → 4 (Naked Single)
51. Riga 3 / Colonna 8 → 9 (Naked Single)
52. Riga 1 / Colonna 8 → 2 (Full House)
53. Riga 3 / Colonna 7 → 8 (Full House)
54. Riga 5 / Colonna 7 → 1 (Naked Single)
55. Riga 2 / Colonna 5 → 9 (Naked Single)
56. Riga 4 / Colonna 5 → 7 (Full House)
57. Riga 2 / Colonna 1 → 2 (Full House)
58. Riga 5 / Colonna 4 → 2 (Full House)
59. Riga 5 / Colonna 2 → 7 (Full House)
60. Riga 6 / Colonna 7 → 3 (Naked Single)
61. Riga 4 / Colonna 7 → 4 (Full House)
62. Riga 4 / Colonna 3 → 3 (Naked Single)
63. Riga 4 / Colonna 1 → 1 (Full House)
64. Riga 1 / Colonna 2 → 9 (Naked Single)
65. Riga 7 / Colonna 2 → 1 (Full House)
66. Riga 7 / Colonna 1 → 9 (Full House)
67. Riga 3 / Colonna 3 → 7 (Naked Single)
68. Riga 6 / Colonna 1 → 8 (Naked Single)
69. Riga 6 / Colonna 3 → 9 (Full House)
70. Riga 1 / Colonna 3 → 6 (Naked Single)
71. Riga 8 / Colonna 3 → 8 (Full House)
72. Riga 8 / Colonna 1 → 6 (Full House)
73. Riga 3 / Colonna 4 → 4 (Naked Single)
74. Riga 1 / Colonna 4 → 7 (Full House)
75. Riga 1 / Colonna 1 → 4 (Full House)
76. Riga 3 / Colonna 1 → 3 (Full House)