Passaggi della soluzione:

1. Locked Pair: 5,6 in r7c46 => r7c12,r9c5<>5, r7c12,r8c5<>6
2. Locked Candidates Type 1 (Pointing): 2 in b9 => r9c12<>2
3. Naked Pair: 2,8 in r37c2 => r125c2<>8, r2c2<>2
4. Riga 1 / Colonna 5 → 8 (Hidden Single)
5. Riga 5 / Colonna 3 → 8 (Hidden Single)
6. Naked Triple: 4,5,9 in r129c2 => r5c2<>5, r8c2<>4
7. Riga 5 / Colonna 4 → 5 (Hidden Single)
8. Riga 4 / Colonna 5 → 6 (Full House)
9. Riga 7 / Colonna 4 → 6 (Full House)
10. Riga 2 / Colonna 5 → 5 (Naked Single)
11. Riga 1 / Colonna 6 → 6 (Full House)
12. Riga 7 / Colonna 6 → 5 (Full House)
13. Riga 1 / Colonna 2 → 5 (Hidden Single)
14. Riga 9 / Colonna 2 → 4 (Naked Single)
15. Riga 2 / Colonna 2 → 9 (Naked Single)
16. Riga 8 / Colonna 3 → 3 (Naked Single)
17. Riga 8 / Colonna 2 → 6 (Naked Single)
18. Riga 5 / Colonna 2 → 3 (Naked Single)
19. Riga 5 / Colonna 8 → 6 (Full House)
20. Riga 8 / Colonna 1 → 1 (Naked Single)
21. Riga 8 / Colonna 5 → 9 (Naked Single)
22. Riga 8 / Colonna 8 → 4 (Full House)
23. Riga 9 / Colonna 5 → 1 (Full House)
24. Riga 9 / Colonna 1 → 5 (Naked Single)
25. Riga 1 / Colonna 8 → 9 (Naked Single)
26. Riga 1 / Colonna 7 → 4 (Full House)
27. Riga 4 / Colonna 1 → 2 (Naked Single)
28. Riga 9 / Colonna 8 → 2 (Naked Single)
29. Riga 2 / Colonna 8 → 3 (Full House)
30. Riga 9 / Colonna 7 → 9 (Full House)
31. Riga 4 / Colonna 3 → 5 (Naked Single)
32. Riga 4 / Colonna 9 → 3 (Full House)
33. Riga 6 / Colonna 3 → 4 (Naked Single)
34. Riga 2 / Colonna 3 → 2 (Full House)
35. Riga 6 / Colonna 1 → 6 (Full House)
36. Riga 7 / Colonna 1 → 8 (Naked Single)
37. Riga 2 / Colonna 1 → 4 (Full House)
38. Riga 3 / Colonna 2 → 8 (Full House)
39. Riga 7 / Colonna 2 → 2 (Full House)
40. Riga 3 / Colonna 9 → 2 (Full House)
41. Riga 6 / Colonna 7 → 2 (Naked Single)
42. Riga 2 / Colonna 7 → 6 (Full House)
43. Riga 2 / Colonna 9 → 8 (Full House)
44. Riga 6 / Colonna 9 → 9 (Full House)