Passaggi della soluzione:

1. Riga 1 / Colonna 9 → 5 (Hidden Single)
2. Riga 6 / Colonna 2 → 3 (Hidden Single)
3. Locked Candidates Type 1 (Pointing): 4 in b3 => r457c8<>4
4. Riga 7 / Colonna 7 → 4 (Hidden Single)
5. Locked Candidates Type 1 (Pointing): 9 in b7 => r1c2<>9
6. Riga 1 / Colonna 2 → 6 (Naked Single)
7. Riga 6 / Colonna 3 → 6 (Hidden Single)
8. Locked Pair: 2,9 in r46c7 => r29c7,r4c89,r5c89,r6c9<>2
9. Riga 2 / Colonna 9 → 2 (Hidden Single)
10. Locked Pair: 1,4 in r46c9 => r5c9<>4, r4c8,r8c9<>1
11. Riga 4 / Colonna 8 → 7 (Naked Single)
12. Riga 2 / Colonna 3 → 7 (Hidden Single)
13. Riga 1 / Colonna 3 → 9 (Hidden Single)
14. Locked Candidates Type 2 (Claiming): 2 in r5 => r4c56,r6c45<>2
15. Locked Candidates Type 2 (Claiming): 4 in r5 => r4c6,r6c4<>4
16. Naked Triple: 5,6,8 in r8c79,r9c7 => r9c8<>6
17. Empty Rectangle: 5 in b4 (r7c26) => r4c6<>5
18. Uniqueness Test 2: 1/2 in r7c48,r9c48 => r6c4,r79c6<>9
19. XY-Chain: 5 5- r3c2 -1- r2c1 -8- r2c7 -6- r9c7 -5 => r9c2<>5
20. Discontinuous Nice Loop: 1 r2c6 -1- r2c1 -8- r1c1 -2- r6c1 =2= r6c7 =9= r6c5 -9- r2c5 =9= r2c6 => r2c6<>1
21. Discontinuous Nice Loop: 1 r3c4 -1- r3c2 =1= r2c1 =8= r1c1 -8- r1c4 =8= r3c4 => r3c4<>1
22. Discontinuous Nice Loop: 5 r9c1 -5- r9c7 -6- r2c7 -8- r2c1 -1- r3c2 -5- r5c2 -7- r9c2 =7= r9c1 => r9c1<>5
23. Hidden Pair: 5,6 in r9c67 => r9c6<>1, r9c6<>2
24. AIC: 6 6- r2c7 -8- r2c1 -1- r3c2 -5- r7c2 =5= r7c6 -5- r9c6 -6 => r2c6,r9c7<>6
25. Riga 9 / Colonna 7 → 5 (Naked Single)
26. Riga 9 / Colonna 6 → 6 (Naked Single)
27. Discontinuous Nice Loop: 2 r3c5 -2- r3c3 -5- r3c2 -1- r2c1 =1= r2c5 =6= r3c5 => r3c5<>2
28. Riga 5 / Colonna 5 → 2 (Hidden Single)
29. X-Wing: 5 r57 c26 => r3c2<>5
30. Riga 3 / Colonna 2 → 1 (Naked Single)
31. Riga 2 / Colonna 1 → 8 (Naked Single)
32. Riga 3 / Colonna 5 → 6 (Naked Single)
33. Riga 1 / Colonna 1 → 2 (Naked Single)
34. Riga 3 / Colonna 3 → 5 (Full House)
35. Riga 2 / Colonna 7 → 6 (Naked Single)
36. Riga 8 / Colonna 3 → 4 (Naked Single)
37. Riga 4 / Colonna 3 → 2 (Full House)
38. Riga 2 / Colonna 8 → 3 (Naked Single)
39. Riga 8 / Colonna 7 → 8 (Naked Single)
40. Riga 4 / Colonna 7 → 9 (Naked Single)
41. Riga 6 / Colonna 7 → 2 (Full House)
42. Riga 2 / Colonna 6 → 9 (Naked Single)
43. Riga 2 / Colonna 5 → 1 (Full House)
44. Riga 8 / Colonna 9 → 6 (Naked Single)
45. Riga 6 / Colonna 5 → 9 (Naked Single)
46. Riga 5 / Colonna 9 → 8 (Naked Single)
47. Riga 5 / Colonna 8 → 6 (Naked Single)
48. W-Wing: 1/3 in r4c6,r8c4 connected by 3 in r1c46 => r6c4,r7c6<>1
49. Riga 6 / Colonna 4 → 7 (Naked Single)
50. Riga 5 / Colonna 4 → 4 (Naked Single)
51. Riga 6 / Colonna 1 → 4 (Naked Single)
52. Riga 6 / Colonna 9 → 1 (Full House)
53. Riga 4 / Colonna 9 → 4 (Full House)
54. Riga 5 / Colonna 6 → 5 (Naked Single)
55. Riga 5 / Colonna 2 → 7 (Full House)
56. Riga 4 / Colonna 1 → 5 (Full House)
57. Riga 4 / Colonna 5 → 3 (Naked Single)
58. Riga 4 / Colonna 6 → 1 (Full House)
59. Riga 8 / Colonna 5 → 5 (Full House)
60. Riga 7 / Colonna 6 → 2 (Naked Single)
61. Riga 9 / Colonna 2 → 9 (Naked Single)
62. Riga 7 / Colonna 2 → 5 (Full House)
63. Riga 8 / Colonna 1 → 1 (Naked Single)
64. Riga 8 / Colonna 4 → 3 (Full House)
65. Riga 9 / Colonna 1 → 7 (Full House)
66. Riga 3 / Colonna 6 → 4 (Naked Single)
67. Riga 1 / Colonna 6 → 3 (Full House)
68. Riga 7 / Colonna 8 → 1 (Naked Single)
69. Riga 7 / Colonna 4 → 9 (Full House)
70. Riga 9 / Colonna 4 → 1 (Full House)
71. Riga 9 / Colonna 8 → 2 (Full House)
72. Riga 1 / Colonna 4 → 8 (Naked Single)
73. Riga 1 / Colonna 8 → 4 (Full House)
74. Riga 3 / Colonna 8 → 8 (Full House)
75. Riga 3 / Colonna 4 → 2 (Full House)