Passaggi della soluzione:

1. Riga 4 / Colonna 7 → 1 (Hidden Single)
2. Riga 3 / Colonna 1 → 2 (Hidden Single)
3. Riga 2 / Colonna 3 → 1 (Hidden Single)
4. Riga 1 / Colonna 6 → 1 (Hidden Single)
5. Riga 7 / Colonna 8 → 1 (Hidden Single)
6. Riga 8 / Colonna 2 → 1 (Hidden Single)
7. Riga 1 / Colonna 3 → 9 (Hidden Single)
8. Riga 7 / Colonna 9 → 9 (Hidden Single)
9. Riga 4 / Colonna 5 → 9 (Hidden Single)
10. Riga 2 / Colonna 7 → 9 (Hidden Single)
11. Riga 3 / Colonna 6 → 9 (Hidden Single)
12. Riga 5 / Colonna 8 → 9 (Hidden Single)
13. Riga 6 / Colonna 8 → 3 (Hidden Single)
14. Riga 1 / Colonna 8 → 6 (Hidden Single)
15. Locked Candidates Type 1 (Pointing): 5 in b2 => r79c4<>5
16. Locked Candidates Type 1 (Pointing): 7 in b3 => r3c45<>7
17. Locked Candidates Type 1 (Pointing): 7 in b4 => r89c3<>7
18. Locked Candidates Type 1 (Pointing): 4 in b9 => r9c23<>4
19. Locked Candidates Type 2 (Claiming): 4 in c3 => r46c1,r5c2<>4
20. Naked Pair: 3,6 in r4c1,r5c2 => r45c3<>3, r6c1<>6
21. Riga 8 / Colonna 3 → 3 (Hidden Single)
22. X-Wing: 6 r59 c24 => r4c4<>6
23. 2-String Kite: 3 in r3c2,r4c4 (connected by r4c1,r5c2) => r3c4<>3
24. Finned Swordfish: 8 r359 c347 fr3c5 => r1c4<>8
25. Discontinuous Nice Loop: 4/7/8 r6c3 =5= r6c1 -5- r8c1 -6- r8c5 =6= r9c4 =8= r9c3 =5= r6c3 => r6c3<>4, r6c3<>7, r6c3<>8
26. Riga 6 / Colonna 3 → 5 (Naked Single)
27. Riga 6 / Colonna 1 → 8 (Naked Single)
28. Riga 9 / Colonna 3 → 8 (Naked Single)
29. Riga 5 / Colonna 3 → 4 (Naked Single)
30. Riga 4 / Colonna 3 → 7 (Full House)
31. Riga 5 / Colonna 7 → 8 (Hidden Single)
32. Riga 1 / Colonna 9 → 8 (Hidden Single)
33. Locked Candidates Type 1 (Pointing): 2 in b6 => r6c56<>2
34. Riga 6 / Colonna 6 → 7 (Naked Single)
35. Empty Rectangle: 4 in b3 (r4c49) => r3c4<>4
36. Grouped AIC: 3/6 3- r4c1 -6- r8c1 -5- r7c12 =5= r7c6 =3= r5c6 -3- r5c2 -6 => r5c2<>3, r4c1<>6
37. Riga 5 / Colonna 2 → 6 (Naked Single)
38. Riga 4 / Colonna 1 → 3 (Full House)
39. Riga 4 / Colonna 4 → 4 (Naked Single)
40. Riga 4 / Colonna 9 → 6 (Full House)
41. Riga 6 / Colonna 5 → 6 (Naked Single)
42. Riga 3 / Colonna 2 → 3 (Hidden Single)
43. Riga 8 / Colonna 1 → 6 (Hidden Single)
44. Riga 9 / Colonna 4 → 6 (Hidden Single)
45. Locked Candidates Type 2 (Claiming): 5 in r8 => r9c7<>5
46. Naked Pair: 4,5 in r2c19 => r2c4<>5, r2c5<>4
47. XY-Chain: 7 7- r2c4 -3- r5c4 -2- r5c6 -3- r7c6 -5- r9c6 -2- r8c5 -7 => r2c5,r7c4<>7
48. Riga 2 / Colonna 5 → 3 (Naked Single)
49. Riga 2 / Colonna 4 → 7 (Naked Single)
50. XY-Chain: 4 4- r2c9 -5- r8c9 -2- r8c5 -7- r7c5 -8- r3c5 -4 => r3c78<>4
51. Riga 3 / Colonna 8 → 7 (Naked Single)
52. Riga 9 / Colonna 8 → 4 (Full House)
53. Riga 3 / Colonna 7 → 5 (Naked Single)
54. Riga 2 / Colonna 9 → 4 (Full House)
55. Riga 2 / Colonna 1 → 5 (Full House)
56. Riga 1 / Colonna 2 → 4 (Full House)
57. Riga 7 / Colonna 1 → 4 (Full House)
58. Riga 3 / Colonna 4 → 8 (Naked Single)
59. Riga 3 / Colonna 5 → 4 (Full House)
60. Riga 6 / Colonna 9 → 2 (Naked Single)
61. Riga 6 / Colonna 7 → 4 (Full House)
62. Riga 8 / Colonna 9 → 5 (Full House)
63. Riga 1 / Colonna 5 → 2 (Naked Single)
64. Riga 1 / Colonna 4 → 5 (Full House)
65. Riga 7 / Colonna 4 → 3 (Naked Single)
66. Riga 5 / Colonna 4 → 2 (Full House)
67. Riga 5 / Colonna 6 → 3 (Full House)
68. Riga 8 / Colonna 5 → 7 (Naked Single)
69. Riga 7 / Colonna 5 → 8 (Full House)
70. Riga 8 / Colonna 7 → 2 (Full House)
71. Riga 9 / Colonna 7 → 7 (Full House)
72. Riga 7 / Colonna 6 → 5 (Naked Single)
73. Riga 7 / Colonna 2 → 7 (Full House)
74. Riga 9 / Colonna 2 → 5 (Full House)
75. Riga 9 / Colonna 6 → 2 (Full House)