5
7
4
8
3
2
1
9
5
9
1
2
6
2
4
8
5
4
5
3
7
1
8
9

This Sudoku Puzzle has 66 steps and it is solved using Hidden Single, Naked Single, Locked Candidates Type 1 (Pointing), Turbot Fish, undefined, Naked Triple, AIC, Full House techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 5 / Column 5 → 5 (Hidden Single)
2. Row 4 / Column 1 → 4 (Hidden Single)
3. Row 2 / Column 4 → 5 (Hidden Single)
4. Row 2 / Column 6 → 2 (Naked Single)
5. Row 2 / Column 5 → 6 (Naked Single)
6. Row 8 / Column 6 → 4 (Naked Single)
7. Row 8 / Column 4 → 6 (Naked Single)
8. Row 8 / Column 5 → 2 (Naked Single)
9. Row 7 / Column 6 → 5 (Hidden Single)
10. Row 5 / Column 9 → 1 (Hidden Single)
11. Row 4 / Column 5 → 8 (Hidden Single)
12. Row 4 / Column 6 → 1 (Hidden Single)
13. Locked Candidates Type 1 (Pointing): 7 in b5 => r6c238<>7
14. Locked Candidates Type 1 (Pointing): 3 in b8 => r6c5<>3
15. Locked Candidates Type 1 (Pointing): 9 in b8 => r136c5<>9
16. Locked Candidates Type 1 (Pointing): 9 in b2 => r1c13<>9
17. Turbot Fish: 8 r1c9 =8= r2c8 -8- r2c2 =8= r8c2 => r8c9<>8
18. Row 8 / Column 9 → 7 (Naked Single)
19. X-Wing: 8 r28 c28 => r7c8<>8
20. XY-Chain: 4 4- r1c4 -9- r4c4 -3- r4c9 -6- r3c9 -4 => r1c79,r3c5<>4
21. Naked Triple: 3,6,7 in r157c7 => r39c7<>6, r3c7<>7, r9c7<>3
22. AIC: 3 3- r1c1 =3= r5c1 -3- r5c7 -7- r1c7 =7= r3c8 -7- r3c5 -1- r3c2 =1= r8c2 =8= r8c8 -8- r2c8 -3 => r1c79,r2c2<>3
23. Row 2 / Column 2 → 8 (Naked Single)
24. Row 2 / Column 8 → 3 (Full House)
25. Row 8 / Column 2 → 1 (Naked Single)
26. Row 8 / Column 8 → 8 (Full House)
27. Row 1 / Column 1 → 3 (Hidden Single)
28. Row 5 / Column 1 → 8 (Naked Single)
29. Row 5 / Column 3 → 7 (Naked Single)
30. Row 5 / Column 7 → 3 (Full House)
31. Row 4 / Column 9 → 6 (Naked Single)
32. Row 7 / Column 7 → 6 (Naked Single)
33. Row 1 / Column 9 → 8 (Naked Single)
34. Row 3 / Column 9 → 4 (Naked Single)
35. Row 4 / Column 2 → 3 (Naked Single)
36. Row 6 / Column 8 → 9 (Naked Single)
37. Row 4 / Column 8 → 7 (Full House)
38. Row 4 / Column 4 → 9 (Full House)
39. Row 1 / Column 7 → 7 (Naked Single)
40. Row 7 / Column 8 → 1 (Naked Single)
41. Row 9 / Column 8 → 5 (Naked Single)
42. Row 3 / Column 8 → 6 (Full House)
43. Row 3 / Column 7 → 5 (Full House)
44. Row 9 / Column 7 → 4 (Full House)
45. Row 6 / Column 6 → 7 (Naked Single)
46. Row 1 / Column 6 → 9 (Full House)
47. Row 1 / Column 4 → 4 (Naked Single)
48. Row 6 / Column 4 → 3 (Full House)
49. Row 6 / Column 5 → 4 (Full House)
50. Row 3 / Column 2 → 2 (Naked Single)
51. Row 1 / Column 5 → 1 (Naked Single)
52. Row 1 / Column 3 → 6 (Full House)
53. Row 3 / Column 5 → 7 (Full House)
54. Row 3 / Column 1 → 9 (Naked Single)
55. Row 3 / Column 3 → 1 (Full House)
56. Row 6 / Column 2 → 6 (Naked Single)
57. Row 6 / Column 3 → 2 (Full House)
58. Row 9 / Column 2 → 7 (Full House)
59. Row 7 / Column 1 → 2 (Naked Single)
60. Row 9 / Column 1 → 6 (Full House)
61. Row 9 / Column 3 → 9 (Naked Single)
62. Row 7 / Column 3 → 8 (Full House)
63. Row 7 / Column 9 → 3 (Naked Single)
64. Row 7 / Column 5 → 9 (Full House)
65. Row 9 / Column 5 → 3 (Full House)
66. Row 9 / Column 9 → 2 (Full House)