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

This Sudoku Puzzle has 72 steps and it is solved using Brute Force, Hidden Single, Naked Single, Locked Candidates Type 1 (Pointing), Hidden Pair, Hidden Triple, Empty Rectangle, Locked Candidates Type 2 (Claiming), Naked Pair, AIC, Full House techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 5 / Column 3 → 9 (Brute Force)
2. Row 2 / Column 1 → 9 (Hidden Single)
3. Row 5 / Column 4 → 8 (Brute Force)
4. Row 5 / Column 8 → 2 (Naked Single)
5. Row 6 / Column 2 → 8 (Hidden Single)
6. Locked Candidates Type 1 (Pointing): 3 in b5 => r4c1<>3
7. Hidden Pair: 1,8 in r9c56 => r9c56<>2, r9c56<>3, r9c56<>6, r9c5<>7
8. Locked Candidates Type 1 (Pointing): 6 in b8 => r8c12<>6
9. Hidden Triple: 1,5,8 in r129c5 => r12c5<>2, r1c5<>3, r12c5<>7
10. Row 1 / Column 4 → 7 (Hidden Single)
11. Locked Candidates Type 1 (Pointing): 2 in b2 => r678c6<>2
12. Empty Rectangle: 6 in b3 (r15c2) => r5c9<>6
13. Row 5 / Column 9 → 1 (Naked Single)
14. Row 4 / Column 1 → 1 (Hidden Single)
15. Row 3 / Column 6 → 1 (Hidden Single)
16. Row 1 / Column 5 → 5 (Naked Single)
17. Row 9 / Column 6 → 8 (Naked Single)
18. Row 2 / Column 5 → 8 (Naked Single)
19. Row 9 / Column 5 → 1 (Naked Single)
20. Row 3 / Column 8 → 8 (Hidden Single)
21. Row 4 / Column 7 → 8 (Hidden Single)
22. Locked Candidates Type 1 (Pointing): 5 in b1 => r3c9<>5
23. Locked Candidates Type 2 (Claiming): 6 in r5 => r46c3,r6c1<>6
24. Naked Pair: 4,9 in r14c8 => r2c8<>4
25. AIC: 3/6 6- r1c7 =6= r6c7 -6- r4c9 =6= r4c5 =3= r4c4 -3- r3c4 =3= r3c9 -3 => r1c7<>3, r3c9<>6
26. Locked Candidates Type 1 (Pointing): 3 in b3 => r89c9<>3
27. Locked Candidates Type 1 (Pointing): 6 in b3 => r1c23<>6
28. Row 5 / Column 2 → 6 (Hidden Single)
29. Row 5 / Column 1 → 3 (Full House)
30. Row 9 / Column 4 → 3 (Hidden Single)
31. Row 3 / Column 4 → 4 (Naked Single)
32. Row 2 / Column 6 → 2 (Naked Single)
33. Row 1 / Column 6 → 3 (Full House)
34. Row 3 / Column 9 → 3 (Naked Single)
35. Row 4 / Column 5 → 3 (Hidden Single)
36. Row 4 / Column 9 → 6 (Hidden Single)
37. Row 1 / Column 7 → 6 (Hidden Single)
38. Row 1 / Column 2 → 1 (Hidden Single)
39. Row 2 / Column 2 → 4 (Naked Single)
40. Row 1 / Column 3 → 2 (Naked Single)
41. Row 4 / Column 3 → 4 (Naked Single)
42. Row 4 / Column 8 → 9 (Naked Single)
43. Row 4 / Column 4 → 2 (Full House)
44. Row 7 / Column 4 → 9 (Full House)
45. Row 6 / Column 3 → 7 (Naked Single)
46. Row 6 / Column 1 → 2 (Full House)
47. Row 1 / Column 8 → 4 (Naked Single)
48. Row 1 / Column 9 → 9 (Full House)
49. Row 6 / Column 7 → 5 (Naked Single)
50. Row 6 / Column 9 → 4 (Full House)
51. Row 6 / Column 5 → 6 (Naked Single)
52. Row 6 / Column 6 → 9 (Full House)
53. Row 7 / Column 6 → 4 (Naked Single)
54. Row 8 / Column 6 → 6 (Full House)
55. Row 2 / Column 7 → 1 (Naked Single)
56. Row 7 / Column 7 → 3 (Naked Single)
57. Row 8 / Column 7 → 9 (Full House)
58. Row 7 / Column 2 → 2 (Naked Single)
59. Row 8 / Column 2 → 3 (Full House)
60. Row 7 / Column 5 → 7 (Naked Single)
61. Row 7 / Column 1 → 5 (Full House)
62. Row 8 / Column 5 → 2 (Full House)
63. Row 3 / Column 1 → 6 (Naked Single)
64. Row 3 / Column 3 → 5 (Full House)
65. Row 9 / Column 3 → 6 (Full House)
66. Row 8 / Column 9 → 7 (Naked Single)
67. Row 8 / Column 1 → 4 (Full House)
68. Row 9 / Column 1 → 7 (Full House)
69. Row 2 / Column 9 → 5 (Naked Single)
70. Row 2 / Column 8 → 7 (Full House)
71. Row 9 / Column 8 → 5 (Full House)
72. Row 9 / Column 9 → 2 (Full House)