# Solution for Hard Sudoku #1247632598119

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

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

Try To Solve This Puzzle

## Solution Steps:

1. Row 3 / Column 4 → 3 (Naked Single)
2. Row 5 / Column 6 → 6 (Naked Single)
3. Row 3 / Column 2 → 4 (Naked Single)
4. Row 3 / Column 9 → 2 (Naked Single)
5. Row 2 / Column 6 → 8 (Naked Single)
6. Row 3 / Column 5 → 5 (Naked Single)
7. Row 3 / Column 8 → 7 (Full House)
8. Row 2 / Column 7 → 9 (Naked Single)
9. Row 7 / Column 8 → 2 (Naked Single)
10. Row 6 / Column 7 → 5 (Naked Single)
11. Row 7 / Column 6 → 5 (Naked Single)
12. Row 9 / Column 6 → 2 (Full House)
13. Row 9 / Column 7 → 7 (Naked Single)
14. Row 9 / Column 8 → 9 (Naked Single)
15. Row 8 / Column 8 → 8 (Full House)
16. Row 1 / Column 7 → 8 (Naked Single)
17. Row 5 / Column 7 → 2 (Full House)
18. Row 9 / Column 3 → 4 (Naked Single)
19. Row 2 / Column 8 → 4 (Hidden Single)
20. Row 1 / Column 5 → 2 (Hidden Single)
21. Row 1 / Column 8 → 5 (Hidden Single)
22. Row 4 / Column 2 → 8 (Hidden Single)
23. Row 5 / Column 9 → 8 (Hidden Single)
24. Row 5 / Column 8 → 3 (Hidden Single)
25. Row 4 / Column 3 → 2 (Hidden Single)
26. Row 8 / Column 2 → 2 (Hidden Single)
27. Row 6 / Column 9 → 9 (Hidden Single)
28. Locked Candidates Type 1 (Pointing): 3 in b1 => r79c2<>3
29. Locked Candidates Type 1 (Pointing): 1 in b5 => r5c123<>1
30. Row 1 / Column 3 → 1 (Hidden Single)
31. Row 1 / Column 4 → 6 (Naked Single)
32. Row 2 / Column 5 → 1 (Full House)
33. Row 2 / Column 2 → 3 (Naked Single)
34. Row 1 / Column 2 → 9 (Full House)
35. Row 1 / Column 9 → 3 (Full House)
36. Row 2 / Column 9 → 6 (Full House)
37. Row 8 / Column 4 → 4 (Naked Single)
38. Row 5 / Column 4 → 1 (Full House)
39. Row 5 / Column 5 → 4 (Full House)
40. Bivalue Universal Grave + 1 => r9c1<>3, r9c1<>5
41. Row 9 / Column 1 → 6 (Naked Single)
42. Row 4 / Column 1 → 1 (Naked Single)
43. Row 4 / Column 8 → 6 (Full House)
44. Row 6 / Column 8 → 1 (Full House)
45. Row 6 / Column 2 → 6 (Full House)
46. Row 8 / Column 1 → 9 (Naked Single)
47. Row 9 / Column 2 → 5 (Naked Single)
48. Row 9 / Column 5 → 3 (Full House)
49. Row 7 / Column 1 → 3 (Naked Single)
50. Row 5 / Column 1 → 5 (Full House)
51. Row 8 / Column 3 → 7 (Naked Single)
52. Row 5 / Column 3 → 9 (Full House)
53. Row 5 / Column 2 → 7 (Full House)
54. Row 7 / Column 2 → 1 (Full House)
55. Row 7 / Column 5 → 7 (Full House)
56. Row 8 / Column 5 → 6 (Full House)