# Solution for Hard Sudoku #1285324716918

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

This Sudoku Puzzle has 61 steps and it is solved using Hidden Single, Locked Triple, Naked Single, Locked Candidates Type 1 (Pointing), Naked Pair, undefined, Skyscraper, Full House techniques.

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## Solution Steps:

1. Row 8 / Column 8 → 5 (Hidden Single)
2. Locked Triple: 2,3,5 in r3c456 => r1c5,r3c3<>2, r1c5,r2c46,r3c37<>3, r2c46<>5
3. Row 1 / Column 5 → 1 (Naked Single)
4. Row 7 / Column 5 → 5 (Naked Single)
5. Locked Candidates Type 1 (Pointing): 6 in b2 => r2c8<>6
6. Locked Candidates Type 1 (Pointing): 7 in b2 => r2c23<>7
7. Locked Candidates Type 1 (Pointing): 7 in b8 => r7c7<>7
8. Naked Pair: 2,3 in r39c5 => r46c5<>2, r4c5<>3
9. X-Wing: 4 r37 c37 => r2c37,r458c7,r568c3<>4
10. Skyscraper: 4 in r5c8,r8c9 (connected by r58c2) => r46c9<>4
11. Row 8 / Column 9 → 4 (Hidden Single)
12. Row 7 / Column 3 → 4 (Hidden Single)
13. Row 3 / Column 3 → 9 (Naked Single)
14. Row 3 / Column 7 → 4 (Naked Single)
15. Row 8 / Column 7 → 8 (Hidden Single)
16. Row 2 / Column 7 → 3 (Naked Single)
17. Row 1 / Column 8 → 6 (Naked Single)
18. Row 2 / Column 3 → 1 (Naked Single)
19. Row 2 / Column 8 → 8 (Naked Single)
20. Row 1 / Column 9 → 9 (Full House)
21. Row 9 / Column 8 → 1 (Naked Single)
22. Row 6 / Column 8 → 4 (Naked Single)
23. Row 5 / Column 8 → 3 (Full House)
24. Row 7 / Column 7 → 9 (Naked Single)
25. Row 6 / Column 5 → 8 (Naked Single)
26. Row 7 / Column 4 → 7 (Naked Single)
27. Row 7 / Column 6 → 1 (Full House)
28. Row 9 / Column 7 → 7 (Naked Single)
29. Row 9 / Column 9 → 6 (Full House)
30. Row 4 / Column 5 → 4 (Naked Single)
31. Row 6 / Column 9 → 7 (Naked Single)
32. Row 4 / Column 9 → 8 (Full House)
33. Row 2 / Column 4 → 6 (Naked Single)
34. Row 4 / Column 7 → 2 (Naked Single)
35. Row 5 / Column 7 → 1 (Full House)
36. Row 6 / Column 3 → 2 (Naked Single)
37. Row 2 / Column 6 → 7 (Naked Single)
38. Row 5 / Column 4 → 2 (Naked Single)
39. Row 4 / Column 1 → 5 (Naked Single)
40. Row 5 / Column 2 → 4 (Naked Single)
41. Row 5 / Column 3 → 8 (Naked Single)
42. Row 5 / Column 6 → 6 (Full House)
43. Row 6 / Column 4 → 5 (Naked Single)
44. Row 4 / Column 6 → 3 (Full House)
45. Row 4 / Column 2 → 7 (Full House)
46. Row 6 / Column 1 → 1 (Full House)
47. Row 8 / Column 3 → 3 (Naked Single)
48. Row 1 / Column 3 → 7 (Full House)
49. Row 2 / Column 1 → 4 (Naked Single)
50. Row 2 / Column 2 → 5 (Full House)
51. Row 3 / Column 4 → 3 (Naked Single)
52. Row 8 / Column 4 → 9 (Full House)
53. Row 8 / Column 6 → 2 (Naked Single)
54. Row 3 / Column 6 → 5 (Full House)
55. Row 3 / Column 5 → 2 (Full House)
56. Row 8 / Column 2 → 1 (Full House)
57. Row 9 / Column 5 → 3 (Full House)
58. Row 1 / Column 2 → 2 (Naked Single)
59. Row 1 / Column 1 → 3 (Full House)
60. Row 9 / Column 1 → 2 (Full House)
61. Row 9 / Column 2 → 9 (Full House)