Passaggi della soluzione:

1. Riga 5 / Colonna 3 → 2 (Naked Single)
2. Riga 5 / Colonna 7 → 9 (Naked Single)
3. Riga 5 / Colonna 8 → 7 (Naked Single)
4. Riga 5 / Colonna 2 → 3 (Full House)
5. Riga 1 / Colonna 9 → 3 (Hidden Single)
6. Riga 4 / Colonna 4 → 3 (Hidden Single)
7. Riga 7 / Colonna 1 → 3 (Hidden Single)
8. Riga 1 / Colonna 8 → 8 (Hidden Single)
9. Locked Candidates Type 1 (Pointing): 4 in b3 => r2c16<>4
10. Locked Candidates Type 1 (Pointing): 8 in b6 => r4c6<>8
11. Locked Candidates Type 1 (Pointing): 2 in b7 => r8c79<>2
12. Locked Candidates Type 2 (Claiming): 5 in r1 => r2c13,r3c12<>5
13. Naked Triple: 5,6,9 in r247c6 => r38c6<>5, r68c6<>9, r8c6<>6
14. Hidden Pair: 4,7 in r8c6,r9c5 => r9c5<>1, r9c5<>6
15. 2-String Kite: 5 in r3c9,r7c6 (connected by r2c6,r3c4) => r7c9<>5
16. Locked Candidates Type 2 (Claiming): 5 in r7 => r8c4<>5
17. XY-Wing: 1/9/5 in r14c2,r6c3 => r1c3<>5
18. Riga 1 / Colonna 3 → 6 (Naked Single)
19. XY-Chain: 5 5- r1c2 -9- r1c5 -4- r9c5 -7- r8c6 -4- r8c7 -5 => r8c2<>5
20. AIC: 5 5- r3c9 =5= r3c4 =8= r3c6 =4= r8c6 -4- r8c7 -5 => r2c7,r89c9<>5
21. Locked Pair: 2,4 in r2c78 => r2c19,r3c9<>2
22. Continuous Nice Loop: 1/5/6/9 5= r1c1 =4= r3c1 =2= r8c1 =6= r8c4 -6- r2c4 =6= r2c6 -6- r4c6 -9- r4c2 =9= r1c2 =5= r1c1 =4 => r38c1<>1, r8c1<>5, r7c46<>6, r1c1,r4c5<>9
23. Skyscraper: 9 in r1c5,r4c6 (connected by r14c2) => r2c6,r6c5<>9
24. X-Wing: 9 r26 c14 => r78c4<>9
25. Riga 8 / Colonna 9 → 9 (Hidden Single)
26. Sue de Coq: r23c4 - {15689} (r78c4 - {156}, r1c5,r3c6 - {489}) => r3c5<>4
27. Riga 3 / Colonna 5 → 1 (Naked Single)
28. XY-Chain: 5 5- r2c6 -6- r4c6 -9- r6c4 -8- r3c4 -5 => r2c4<>5
29. XY-Chain: 2 2- r4c5 -6- r4c6 -9- r7c6 -5- r7c4 -1- r7c9 -2 => r4c9<>2
30. Riga 7 / Colonna 9 → 2 (Hidden Single)
31. Finned X-Wing: 1 c29 r49 fr8c2 => r9c1<>1
32. Hidden Pair: 1,9 in r26c1 => r6c1<>5
33. Riga 6 / Colonna 3 → 5 (Hidden Single)
34. Riga 8 / Colonna 7 → 5 (Hidden Single)
35. Riga 8 / Colonna 6 → 4 (Hidden Single)
36. Riga 3 / Colonna 6 → 8 (Naked Single)
37. Riga 9 / Colonna 5 → 7 (Naked Single)
38. Riga 3 / Colonna 4 → 5 (Naked Single)
39. Riga 6 / Colonna 6 → 7 (Naked Single)
40. Riga 6 / Colonna 5 → 2 (Naked Single)
41. Riga 2 / Colonna 6 → 6 (Naked Single)
42. Riga 3 / Colonna 9 → 7 (Naked Single)
43. Riga 7 / Colonna 4 → 1 (Naked Single)
44. Riga 4 / Colonna 5 → 6 (Naked Single)
45. Riga 6 / Colonna 8 → 1 (Naked Single)
46. Riga 2 / Colonna 4 → 9 (Naked Single)
47. Riga 1 / Colonna 5 → 4 (Full House)
48. Riga 7 / Colonna 5 → 9 (Full House)
49. Riga 4 / Colonna 6 → 9 (Naked Single)
50. Riga 6 / Colonna 4 → 8 (Full House)
51. Riga 8 / Colonna 4 → 6 (Full House)
52. Riga 6 / Colonna 1 → 9 (Full House)
53. Riga 7 / Colonna 6 → 5 (Full House)
54. Riga 7 / Colonna 8 → 6 (Full House)
55. Riga 4 / Colonna 2 → 1 (Full House)
56. Riga 2 / Colonna 9 → 5 (Naked Single)
57. Riga 3 / Colonna 2 → 2 (Naked Single)
58. Riga 3 / Colonna 1 → 4 (Full House)
59. Riga 4 / Colonna 9 → 8 (Naked Single)
60. Riga 4 / Colonna 7 → 2 (Full House)
61. Riga 9 / Colonna 9 → 1 (Full House)
62. Riga 2 / Colonna 1 → 1 (Naked Single)
63. Riga 1 / Colonna 1 → 5 (Naked Single)
64. Riga 1 / Colonna 2 → 9 (Full House)
65. Riga 2 / Colonna 3 → 7 (Full House)
66. Riga 8 / Colonna 3 → 1 (Full House)
67. Riga 8 / Colonna 1 → 2 (Naked Single)
68. Riga 8 / Colonna 2 → 7 (Full House)
69. Riga 9 / Colonna 2 → 5 (Full House)
70. Riga 9 / Colonna 1 → 6 (Full House)
71. Riga 9 / Colonna 8 → 4 (Naked Single)
72. Riga 2 / Colonna 8 → 2 (Full House)
73. Riga 2 / Colonna 7 → 4 (Full House)
74. Riga 9 / Colonna 7 → 8 (Full House)