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

This Sudoku Puzzle has 67 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Locked Pair, Naked Single, Full House, Uniqueness Test 3, Discontinuous Nice Loop, Sue de Coq, Turbot Fish, undefined techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 2 / Column 8 → 4 (Hidden Single)
2. Row 9 / Column 5 → 5 (Hidden Single)
3. Locked Candidates Type 1 (Pointing): 6 in b8 => r7c7<>6
4. Locked Candidates Type 1 (Pointing): 7 in b8 => r8c78<>7
5. Locked Candidates Type 2 (Claiming): 6 in c6 => r4c45,r6c4<>6
6. Locked Pair: 2,7 in r4c45 => r4c236,r5c56<>2, r4c38,r5c5,r6c4<>7
7. Row 4 / Column 3 → 3 (Naked Single)
8. Row 9 / Column 3 → 2 (Naked Single)
9. Row 5 / Column 1 → 2 (Hidden Single)
10. Row 1 / Column 1 → 5 (Hidden Single)
11. Row 4 / Column 2 → 9 (Hidden Single)
12. Row 4 / Column 8 → 6 (Naked Single)
13. Row 4 / Column 6 → 5 (Naked Single)
14. Row 5 / Column 9 → 5 (Hidden Single)
15. Row 2 / Column 7 → 5 (Hidden Single)
16. Row 6 / Column 2 → 5 (Hidden Single)
17. Row 6 / Column 6 → 6 (Hidden Single)
18. Row 9 / Column 7 → 6 (Hidden Single)
19. Locked Candidates Type 1 (Pointing): 4 in b4 => r137c3<>4
20. Row 7 / Column 3 → 1 (Naked Single)
21. Row 8 / Column 2 → 3 (Naked Single)
22. Row 9 / Column 1 → 9 (Naked Single)
23. Row 7 / Column 1 → 4 (Full House)
24. Row 3 / Column 1 → 3 (Full House)
25. Row 8 / Column 7 → 1 (Hidden Single)
26. Row 2 / Column 5 → 3 (Hidden Single)
27. Row 7 / Column 7 → 2 (Hidden Single)
28. Locked Pair: 7,8 in r3c79 => r1c79,r3c35<>8
29. Row 3 / Column 3 → 6 (Naked Single)
30. Row 1 / Column 3 → 8 (Naked Single)
31. Uniqueness Test 3: 2/7 in r4c45,r8c45 => r8c6<>8
32. Row 8 / Column 6 → 2 (Naked Single)
33. Discontinuous Nice Loop: 7 r5c7 -7- r3c7 -8- r3c9 =8= r7c9 =9= r1c9 -9- r1c7 =9= r5c7 => r5c7<>7
34. Sue de Coq: r56c8 - {3789} (r9c8 - {37}, r5c7 - {89}) => r6c7<>8
35. Turbot Fish: 8 r6c4 =8= r6c8 -8- r8c8 =8= r7c9 => r7c4<>8
36. XY-Chain: 8 8- r5c7 -9- r1c7 -3- r6c7 -7- r6c3 -4- r6c4 -8 => r5c56,r6c8<>8
37. Row 5 / Column 6 → 1 (Naked Single)
38. Row 2 / Column 6 → 8 (Full House)
39. Row 5 / Column 5 → 4 (Naked Single)
40. Row 2 / Column 4 → 2 (Naked Single)
41. Row 2 / Column 2 → 1 (Full House)
42. Row 3 / Column 5 → 1 (Naked Single)
43. Row 5 / Column 3 → 7 (Naked Single)
44. Row 6 / Column 3 → 4 (Full House)
45. Row 6 / Column 4 → 8 (Naked Single)
46. Row 1 / Column 5 → 6 (Naked Single)
47. Row 1 / Column 4 → 4 (Full House)
48. Row 4 / Column 4 → 7 (Naked Single)
49. Row 4 / Column 5 → 2 (Full House)
50. Row 3 / Column 2 → 4 (Naked Single)
51. Row 1 / Column 2 → 2 (Full House)
52. Row 7 / Column 5 → 8 (Naked Single)
53. Row 8 / Column 5 → 7 (Full House)
54. Row 8 / Column 4 → 9 (Naked Single)
55. Row 7 / Column 4 → 6 (Full House)
56. Row 7 / Column 9 → 9 (Full House)
57. Row 8 / Column 8 → 8 (Full House)
58. Row 1 / Column 9 → 3 (Naked Single)
59. Row 1 / Column 7 → 9 (Full House)
60. Row 5 / Column 8 → 9 (Naked Single)
61. Row 5 / Column 7 → 8 (Full House)
62. Row 9 / Column 9 → 7 (Naked Single)
63. Row 3 / Column 9 → 8 (Full House)
64. Row 3 / Column 7 → 7 (Full House)
65. Row 9 / Column 8 → 3 (Full House)
66. Row 6 / Column 7 → 3 (Full House)
67. Row 6 / Column 8 → 7 (Full House)