# Solution for Hard Sudoku #117713524895

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

This Sudoku Puzzle has 56 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Triple, Naked Single, Full House techniques.

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## Solution Steps:

1. Row 1 / Column 9 → 9 (Hidden Single)
2. Row 1 / Column 5 → 7 (Hidden Single)
3. Row 1 / Column 2 → 8 (Hidden Single)
4. Row 5 / Column 3 → 2 (Hidden Single)
5. Row 9 / Column 8 → 8 (Hidden Single)
6. Row 7 / Column 8 → 3 (Hidden Single)
7. Locked Candidates Type 1 (Pointing): 6 in b5 => r23789c5<>6
8. Locked Candidates Type 1 (Pointing): 8 in b5 => r28c5<>8
9. Locked Candidates Type 1 (Pointing): 9 in b5 => r789c5<>9
10. Row 7 / Column 7 → 9 (Hidden Single)
11. Locked Triple: 2,3,4 in r789c5 => r23c5,r9c6<>2, r23c5,r89c4<>3, r23c5,r78c4<>4
12. Row 2 / Column 5 → 1 (Naked Single)
13. Row 3 / Column 5 → 1 (Naked Single)
14. Row 7 / Column 4 → 6 (Naked Single)
15. Row 7 / Column 2 → 4 (Naked Single)
16. Row 7 / Column 9 → 2 (Full House)
17. Row 7 / Column 5 → 2 (Full House)
18. Row 9 / Column 4 → 5 (Naked Single)
19. Row 9 / Column 5 → 3 (Naked Single)
20. Row 1 / Column 4 → 4 (Naked Single)
21. Row 8 / Column 4 → 8 (Naked Single)
22. Row 2 / Column 4 → 3 (Full House)
23. Row 9 / Column 6 → 9 (Naked Single)
24. Row 9 / Column 7 → 6 (Naked Single)
25. Row 8 / Column 7 → 5 (Full House)
26. Row 9 / Column 1 → 1 (Full House)
27. Row 9 / Column 2 → 1 (Full House)
28. Row 8 / Column 5 → 4 (Naked Single)
29. Row 8 / Column 6 → 9 (Naked Single)
30. Row 5 / Column 7 → 4 (Naked Single)
31. Row 4 / Column 7 → 2 (Full House)
32. Row 2 / Column 7 → 2 (Full House)
33. Row 8 / Column 1 → 6 (Naked Single)
34. Row 3 / Column 1 → 4 (Naked Single)
35. Row 5 / Column 1 → 8 (Naked Single)
36. Row 4 / Column 1 → 9 (Full House)
37. Row 5 / Column 9 → 6 (Full House)
38. Row 8 / Column 3 → 3 (Naked Single)
39. Row 2 / Column 9 → 5 (Naked Single)
40. Row 6 / Column 9 → 8 (Full House)
41. Row 4 / Column 8 → 5 (Full House)
42. Row 6 / Column 8 → 5 (Full House)
43. Row 2 / Column 3 → 6 (Naked Single)
44. Row 3 / Column 8 → 6 (Naked Single)
45. Row 4 / Column 2 → 6 (Naked Single)
46. Row 4 / Column 5 → 8 (Full House)
47. Row 6 / Column 2 → 6 (Naked Single)
48. Row 6 / Column 5 → 9 (Full House)
49. Row 2 / Column 6 → 8 (Naked Single)
50. Row 3 / Column 3 → 5 (Naked Single)
51. Row 6 / Column 3 → 4 (Naked Single)
52. Row 1 / Column 3 → 1 (Full House)
53. Row 3 / Column 2 → 3 (Full House)
54. Row 1 / Column 8 → 1 (Naked Single)
55. Row 3 / Column 6 → 2 (Naked Single)
56. Row 1 / Column 6 → 6 (Hidden Single)