Passaggi della soluzione:

1. Riga 3 / Colonna 8 → 6 (Hidden Single)
2. Locked Pair: 3,7 in r12c9 => r1c8,r2c7,r467c9<>3, r1c8,r2c7,r4678c9<>7
3. Riga 6 / Colonna 9 → 6 (Naked Single)
4. Riga 4 / Colonna 9 → 4 (Naked Single)
5. Riga 7 / Colonna 7 → 6 (Hidden Single)
6. Riga 2 / Colonna 3 → 4 (Hidden Single)
7. Riga 5 / Colonna 2 → 4 (Hidden Single)
8. Riga 7 / Colonna 1 → 4 (Hidden Single)
9. Riga 2 / Colonna 1 → 9 (Hidden Single)
10. Riga 9 / Colonna 8 → 4 (Hidden Single)
11. Riga 5 / Colonna 5 → 6 (Hidden Single)
12. Riga 4 / Colonna 2 → 6 (Hidden Single)
13. Riga 6 / Colonna 2 → 5 (Hidden Single)
14. Riga 6 / Colonna 3 → 9 (Hidden Single)
15. Riga 8 / Colonna 9 → 9 (Hidden Single)
16. Riga 7 / Colonna 9 → 1 (Naked Single)
17. Locked Candidates Type 1 (Pointing): 7 in b5 => r13c6<>7
18. Finned Swordfish: 8 r159 c467 fr5c8 => r46c7<>8
19. Locked Candidates Type 1 (Pointing): 8 in b6 => r8c8<>8
20. XY-Chain: 2 2- r1c8 -5- r8c8 -7- r8c1 -1- r8c3 -2 => r1c3<>2
21. Riga 8 / Colonna 3 → 2 (Hidden Single)
22. Empty Rectangle: 1 in b4 (r8c15) => r4c5<>1
23. Discontinuous Nice Loop: 3 r2c5 -3- r2c9 =3= r1c9 -3- r1c3 =3= r3c1 =7= r8c1 -7- r8c8 -5- r8c7 =5= r2c7 =2= r2c5 => r2c5<>3
24. Naked Pair: 2,5 in r2c57 => r2c4<>5
25. Uniqueness Test 1: 3/7 in r1c49,r2c49 => r1c4<>3, r1c4<>7
26. Discontinuous Nice Loop: 7 r3c2 -7- r3c1 =7= r8c1 -7- r8c8 -5- r1c8 -2- r1c2 =2= r3c2 => r3c2<>7
27. Sue de Coq: r1c23 - {1237} (r1c9 - {37}, r3c2 - {12}) => r3c1<>1, r1c6<>3
28. Discontinuous Nice Loop: 1 r6c6 -1- r6c5 =1= r8c5 =8= r8c7 -8- r9c7 -3- r4c7 -7- r4c6 =7= r6c6 => r6c6<>1
29. X-Wing: 1 r68 c15 => r4c1<>1
30. Discontinuous Nice Loop: 7 r6c7 -7- r6c6 =7= r4c6 =5= r4c5 -5- r2c5 -2- r2c7 =2= r6c7 => r6c7<>7
31. Discontinuous Nice Loop: 3 r7c6 -3- r7c8 =3= r9c7 -3- r6c7 -2- r2c7 =2= r2c5 -2- r7c5 =2= r7c6 => r7c6<>3
32. Discontinuous Nice Loop: 5 r7c6 -5- r7c4 =5= r1c4 -5- r2c5 -2- r7c5 =2= r7c6 => r7c6<>5
33. Grouped AIC: 2 2- r2c5 =2= r2c7 -2- r6c7 -3- r5c8 =3= r5c46 -3- r46c5 =3= r7c5 =2= r7c6 -2 => r13c6,r7c5<>2
34. Riga 3 / Colonna 2 → 2 (Hidden Single)
35. Riga 7 / Colonna 6 → 2 (Hidden Single)
36. Riga 2 / Colonna 5 → 2 (Hidden Single)
37. Riga 2 / Colonna 7 → 5 (Naked Single)
38. Riga 1 / Colonna 8 → 2 (Naked Single)
39. Riga 6 / Colonna 7 → 2 (Hidden Single)
40. Locked Candidates Type 1 (Pointing): 1 in b1 => r1c46<>1
41. W-Wing: 3/1 in r1c3,r3c6 connected by 1 in r4c36 => r3c1<>3
42. Riga 3 / Colonna 1 → 7 (Naked Single)
43. Riga 1 / Colonna 2 → 1 (Naked Single)
44. Riga 1 / Colonna 3 → 3 (Full House)
45. Riga 4 / Colonna 3 → 1 (Full House)
46. Riga 8 / Colonna 1 → 1 (Naked Single)
47. Riga 9 / Colonna 2 → 9 (Naked Single)
48. Riga 7 / Colonna 2 → 7 (Full House)
49. Riga 1 / Colonna 9 → 7 (Naked Single)
50. Riga 2 / Colonna 9 → 3 (Full House)
51. Riga 2 / Colonna 4 → 7 (Full House)
52. Riga 6 / Colonna 5 → 1 (Hidden Single)
53. Riga 7 / Colonna 4 → 9 (Hidden Single)
54. Riga 5 / Colonna 6 → 9 (Hidden Single)
55. Riga 1 / Colonna 4 → 5 (Hidden Single)
56. Riga 1 / Colonna 6 → 8 (Full House)
57. Riga 4 / Colonna 6 → 5 (Hidden Single)
58. Riga 4 / Colonna 7 → 7 (Hidden Single)
59. Riga 8 / Colonna 7 → 8 (Naked Single)
60. Riga 9 / Colonna 7 → 3 (Full House)
61. Riga 8 / Colonna 5 → 5 (Naked Single)
62. Riga 8 / Colonna 8 → 7 (Full House)
63. Riga 7 / Colonna 8 → 5 (Full House)
64. Riga 7 / Colonna 5 → 3 (Full House)
65. Riga 4 / Colonna 5 → 8 (Full House)
66. Riga 4 / Colonna 1 → 3 (Full House)
67. Riga 6 / Colonna 1 → 8 (Full House)
68. Riga 9 / Colonna 6 → 1 (Naked Single)
69. Riga 9 / Colonna 4 → 8 (Full House)
70. Riga 5 / Colonna 4 → 3 (Naked Single)
71. Riga 3 / Colonna 4 → 1 (Full House)
72. Riga 3 / Colonna 6 → 3 (Full House)
73. Riga 5 / Colonna 8 → 8 (Full House)
74. Riga 6 / Colonna 8 → 3 (Full House)
75. Riga 6 / Colonna 6 → 7 (Full House)