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

This Sudoku Puzzle has 74 steps and it is solved using Naked Single, Hidden Single, Locked Triple, Full House, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Hidden Pair, Empty Rectangle, Naked Pair, Hidden Rectangle, undefined, Uniqueness Test 1 techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 5 / Column 4 → 8 (Naked Single)
2. Row 5 / Column 6 → 3 (Hidden Single)
3. Row 3 / Column 4 → 9 (Hidden Single)
4. Row 7 / Column 6 → 6 (Hidden Single)
5. Row 2 / Column 5 → 4 (Hidden Single)
6. Locked Triple: 1,5,7 in r1c456 => r1c28<>5, r1c2,r2c6<>7
7. Row 2 / Column 3 → 7 (Hidden Single)
8. Row 5 / Column 3 → 6 (Naked Single)
9. Row 1 / Column 6 → 7 (Hidden Single)
10. Row 2 / Column 6 → 2 (Hidden Single)
11. Row 3 / Column 6 → 8 (Naked Single)
12. Row 9 / Column 6 → 1 (Full House)
13. Row 3 / Column 2 → 2 (Hidden Single)
14. Locked Candidates Type 1 (Pointing): 5 in b1 => r4c1<>5
15. Locked Candidates Type 1 (Pointing): 9 in b7 => r7c78<>9
16. Locked Candidates Type 2 (Claiming): 2 in r9 => r7c4,r8c5<>2
17. Locked Candidates Type 2 (Claiming): 4 in c7 => r7c89,r8c89,r9c8<>4
18. Hidden Pair: 5,7 in r45c2 => r4c2<>1, r4c2<>3, r4c2<>8
19. Locked Candidates Type 1 (Pointing): 1 in b4 => r78c1<>1
20. Locked Candidates Type 1 (Pointing): 8 in b4 => r78c3<>8
21. Hidden Pair: 1,2 in r78c9 => r78c9<>5, r7c9<>7, r78c9<>8, r8c9<>3
22. Row 7 / Column 8 → 7 (Hidden Single)
23. Empty Rectangle: 3 in b7 (r1c28) => r8c8<>3
24. Naked Pair: 5,8 in r8c58 => r8c27<>8, r8c7<>5
25. Hidden Rectangle: 4/5 in r3c89,r5c89 => r3c9<>5
26. XY-Chain: 4 4- r3c9 -3- r1c8 -6- r1c2 -3- r9c2 -8- r9c5 -2- r9c4 -4- r7c4 -5- r8c5 -8- r8c8 -5- r5c8 -4 => r3c8,r5c9<>4
27. Row 3 / Column 9 → 4 (Hidden Single)
28. Row 5 / Column 8 → 4 (Hidden Single)
29. Locked Candidates Type 1 (Pointing): 3 in b3 => r69c8<>3
30. Locked Candidates Type 1 (Pointing): 3 in b9 => r46c7<>3
31. Uniqueness Test 1: 5/7 in r4c29,r5c29 => r4c9<>5, r4c9<>7
32. XY-Chain: 4 4- r7c1 -9- r7c3 -2- r8c3 -3- r8c7 -4 => r7c7,r8c1<>4
33. Row 8 / Column 7 → 4 (Hidden Single)
34. Row 7 / Column 1 → 4 (Hidden Single)
35. Row 7 / Column 4 → 5 (Naked Single)
36. Row 1 / Column 4 → 1 (Naked Single)
37. Row 1 / Column 5 → 5 (Full House)
38. Row 7 / Column 7 → 8 (Naked Single)
39. Row 8 / Column 5 → 8 (Naked Single)
40. Row 6 / Column 4 → 2 (Naked Single)
41. Row 9 / Column 4 → 4 (Full House)
42. Row 9 / Column 5 → 2 (Full House)
43. Row 7 / Column 2 → 1 (Naked Single)
44. Row 8 / Column 8 → 5 (Naked Single)
45. Row 9 / Column 8 → 9 (Naked Single)
46. Row 7 / Column 9 → 2 (Naked Single)
47. Row 7 / Column 3 → 9 (Full House)
48. Row 3 / Column 8 → 3 (Naked Single)
49. Row 3 / Column 1 → 5 (Full House)
50. Row 9 / Column 7 → 3 (Naked Single)
51. Row 8 / Column 9 → 1 (Full House)
52. Row 9 / Column 2 → 8 (Full House)
53. Row 1 / Column 8 → 6 (Naked Single)
54. Row 1 / Column 2 → 3 (Full House)
55. Row 2 / Column 1 → 6 (Full House)
56. Row 6 / Column 8 → 8 (Full House)
57. Row 2 / Column 7 → 5 (Naked Single)
58. Row 2 / Column 9 → 8 (Full House)
59. Row 8 / Column 2 → 6 (Naked Single)
60. Row 8 / Column 1 → 3 (Naked Single)
61. Row 8 / Column 3 → 2 (Full House)
62. Row 4 / Column 9 → 3 (Naked Single)
63. Row 6 / Column 3 → 3 (Naked Single)
64. Row 4 / Column 3 → 8 (Full House)
65. Row 4 / Column 7 → 9 (Naked Single)
66. Row 6 / Column 7 → 6 (Full House)
67. Row 6 / Column 9 → 7 (Naked Single)
68. Row 5 / Column 9 → 5 (Full House)
69. Row 5 / Column 2 → 7 (Full House)
70. Row 4 / Column 2 → 5 (Full House)
71. Row 4 / Column 1 → 1 (Naked Single)
72. Row 4 / Column 5 → 7 (Full House)
73. Row 6 / Column 5 → 1 (Full House)
74. Row 6 / Column 1 → 9 (Full House)