Passaggi della soluzione:

1. Locked Candidates Type 1 (Pointing): 3 in b8 => r9c13<>3
2. Hidden Pair: 2,8 in r2c2,r3c3 => r2c2,r3c3<>4, r2c2,r3c3<>9, r3c3<>3, r3c3<>6
3. Hidden Pair: 2,8 in r7c8,r9c7 => r7c8<>6, r9c7<>5, r9c7<>7
4. Locked Candidates Type 1 (Pointing): 7 in b9 => r3c9<>7
5. Finned Swordfish: 2 r359 c367 fr9c5 => r7c6<>2
6. Hidden Pair: 2,3 in r59c6 => r59c6<>4, r59c6<>5
7. Locked Candidates Type 2 (Claiming): 5 in c6 => r1c5,r2c4<>5
8. Discontinuous Nice Loop: 4 r1c6 -4- r2c4 -9- r2c9 -5- r2c6 =5= r1c6 => r1c6<>4
9. Discontinuous Nice Loop: 5 r2c8 -5- r2c9 -9- r2c4 -4- r3c6 -8- r3c3 -2- r3c7 =2= r2c8 => r2c8<>5
10. Discontinuous Nice Loop: 1 r7c5 -1- r7c6 -4- r3c6 -8- r3c3 -2- r3c7 =2= r9c7 -2- r7c8 =2= r7c5 => r7c5<>1
11. W-Wing: 5/1 in r1c6,r8c7 connected by 1 in r7c69 => r1c7<>5
12. Discontinuous Nice Loop: 5 r4c9 -5- r2c9 =5= r1c8 -5- r8c8 -6- r4c8 =6= r4c9 => r4c9<>5
13. Discontinuous Nice Loop: 5 r9c9 -5- r2c9 =5= r2c6 -5- r1c6 -1- r7c6 =1= r7c9 =7= r9c9 => r9c9<>5
14. Locked Candidates Type 1 (Pointing): 5 in b9 => r8c5<>5
15. AIC: 2 2- r3c3 -8- r3c6 -4- r7c6 -1- r7c9 =1= r8c7 =5= r8c8 =6= r4c8 =8= r7c8 =2= r2c8 -2- r2c2 =2= r4c2 -2 => r2c2,r45c3<>2
16. Riga 2 / Colonna 2 → 8 (Naked Single)
17. Riga 3 / Colonna 3 → 2 (Naked Single)
18. Riga 2 / Colonna 8 → 2 (Hidden Single)
19. Riga 7 / Colonna 8 → 8 (Naked Single)
20. Riga 9 / Colonna 7 → 2 (Naked Single)
21. Riga 9 / Colonna 6 → 3 (Naked Single)
22. Riga 5 / Colonna 6 → 2 (Naked Single)
23. Riga 4 / Colonna 2 → 2 (Hidden Single)
24. Riga 3 / Colonna 6 → 8 (Hidden Single)
25. Riga 9 / Colonna 3 → 8 (Hidden Single)
26. Riga 7 / Colonna 5 → 2 (Hidden Single)
27. Riga 4 / Colonna 7 → 8 (Hidden Single)
28. Empty Rectangle: 4 in b7 (r27c6) => r2c1<>4
29. Locked Candidates Type 2 (Claiming): 4 in r2 => r13c5,r3c4<>4
30. Sue de Coq: r13c5 - {1679} (r469c5 - {4567}, r12c6,r2c4 - {1459}) => r3c4<>9, r8c5<>6
31. AIC: 1/6 6- r1c3 =6= r8c3 -6- r8c8 -5- r8c7 -1- r8c5 =1= r1c5 -1 => r1c3<>1, r1c5<>6
32. Locked Candidates Type 1 (Pointing): 1 in b1 => r5c1<>1
33. Locked Candidates Type 1 (Pointing): 6 in b2 => r3c1<>6
34. Discontinuous Nice Loop: 3 r1c3 -3- r1c8 =3= r3c9 -3- r4c9 -6- r4c8 =6= r8c8 -6- r8c3 =6= r1c3 => r1c3<>3
35. Discontinuous Nice Loop: 4 r1c3 -4- r4c3 -3- r4c9 -6- r4c8 =6= r8c8 -6- r8c3 =6= r1c3 => r1c3<>4
36. Locked Candidates Type 2 (Claiming): 4 in c3 => r45c1,r6c2<>4
37. AIC: 4 4- r1c2 =4= r7c2 -4- r7c6 -1- r7c9 =1= r8c7 =5= r8c8 =6= r4c8 -6- r4c9 -3- r3c9 =3= r3c1 =4= r3c7 -4 => r1c78,r3c1<>4
38. Riga 3 / Colonna 7 → 4 (Hidden Single)
39. Riga 1 / Colonna 7 → 7 (Hidden Single)
40. Locked Candidates Type 1 (Pointing): 9 in b3 => r5c9<>9
41. Naked Pair: 3,9 in r3c19 => r3c5<>9
42. Discontinuous Nice Loop: 3/4/9 r6c3 =1= r6c7 -1- r8c7 =1= r8c5 =9= r1c5 -9- r2c4 -4- r5c4 =4= r5c3 =1= r6c3 => r6c3<>3, r6c3<>4, r6c3<>9
43. Riga 6 / Colonna 3 → 1 (Naked Single)
44. AIC: 4 4- r2c4 -9- r7c4 =9= r8c5 =1= r8c7 =5= r8c8 =6= r4c8 -6- r4c9 -3- r4c3 -4- r5c3 =4= r5c4 -4 => r679c4<>4
45. XY-Chain: 6 6- r7c4 -9- r8c5 -1- r8c7 -5- r8c8 -6 => r7c9<>6
46. Sue de Coq: r7c12 - {4679} (r7c69 - {147}, r8c23 - {369}) => r9c1<>6
47. AIC: 9 9- r1c3 -6- r1c1 =6= r7c1 -6- r7c4 -9- r2c4 =9= r1c5 -9 => r1c12<>9
48. XY-Chain: 4 4- r1c2 -3- r1c8 -5- r8c8 -6- r9c9 -7- r9c1 -4 => r1c1,r7c2<>4
49. Riga 1 / Colonna 2 → 4 (Hidden Single)
50. Locked Candidates Type 1 (Pointing): 3 in b1 => r45c1<>3
51. W-Wing: 5/9 in r2c9,r5c1 connected by 9 in r3c19 => r5c9<>5
52. Riga 2 / Colonna 9 → 5 (Hidden Single)
53. Riga 1 / Colonna 8 → 3 (Naked Single)
54. Riga 3 / Colonna 9 → 9 (Full House)
55. Riga 3 / Colonna 1 → 3 (Naked Single)
56. Riga 1 / Colonna 6 → 5 (Hidden Single)
57. Sue de Coq: r7c46 - {1469} (r7c29 - {179}, r9c45 - {456}) => r7c1<>7, r7c1<>9
58. XY-Chain: 9 9- r5c1 -5- r4c1 -7- r9c1 -4- r7c1 -6- r7c4 -9- r8c5 -1- r8c7 -5- r6c7 -9 => r5c7,r6c2<>9
59. Riga 6 / Colonna 7 → 9 (Hidden Single)
60. Locked Candidates Type 2 (Claiming): 9 in c2 => r8c3<>9
61. W-Wing: 3/6 in r4c9,r8c3 connected by 6 in r48c8 => r4c3<>3
62. Riga 4 / Colonna 3 → 4 (Naked Single)
63. Riga 4 / Colonna 9 → 3 (Hidden Single)
64. Riga 5 / Colonna 9 → 1 (Naked Single)
65. Riga 5 / Colonna 7 → 5 (Naked Single)
66. Riga 8 / Colonna 7 → 1 (Full House)
67. Riga 7 / Colonna 9 → 7 (Naked Single)
68. Riga 9 / Colonna 9 → 6 (Full House)
69. Riga 8 / Colonna 8 → 5 (Full House)
70. Riga 4 / Colonna 8 → 6 (Naked Single)
71. Riga 6 / Colonna 8 → 4 (Full House)
72. Riga 5 / Colonna 1 → 9 (Naked Single)
73. Riga 8 / Colonna 5 → 9 (Naked Single)
74. Riga 7 / Colonna 2 → 9 (Naked Single)
75. Riga 9 / Colonna 4 → 5 (Naked Single)
76. Riga 2 / Colonna 1 → 1 (Naked Single)
77. Riga 5 / Colonna 3 → 3 (Naked Single)
78. Riga 5 / Colonna 4 → 4 (Full House)
79. Riga 1 / Colonna 5 → 1 (Naked Single)
80. Riga 7 / Colonna 4 → 6 (Naked Single)
81. Riga 8 / Colonna 2 → 3 (Naked Single)
82. Riga 6 / Colonna 2 → 7 (Full House)
83. Riga 8 / Colonna 3 → 6 (Full House)
84. Riga 4 / Colonna 1 → 5 (Full House)
85. Riga 1 / Colonna 3 → 9 (Full House)
86. Riga 1 / Colonna 1 → 6 (Full House)
87. Riga 4 / Colonna 5 → 7 (Full House)
88. Riga 9 / Colonna 5 → 4 (Naked Single)
89. Riga 7 / Colonna 6 → 1 (Full House)
90. Riga 2 / Colonna 6 → 4 (Full House)
91. Riga 2 / Colonna 4 → 9 (Full House)
92. Riga 7 / Colonna 1 → 4 (Full House)
93. Riga 9 / Colonna 1 → 7 (Full House)
94. Riga 3 / Colonna 4 → 7 (Naked Single)
95. Riga 6 / Colonna 4 → 3 (Full House)
96. Riga 6 / Colonna 5 → 5 (Full House)
97. Riga 3 / Colonna 5 → 6 (Full House)