Solution for Hard Sudoku #1317562934819

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

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.

Naked Single Explanation
Hidden Single Explanation
Locked Candidates Explanation
Full House Explanation
Try To Solve This Puzzle

Solution Steps:

  1. Row 6 / Column 5 → 5 (Naked Single)
  2. Row 4 / Column 7 → 6 (Naked Single)
  3. Row 6 / Column 8 → 4 (Naked Single)
  4. Row 2 / Column 7 → 1 (Naked Single)
  5. Row 9 / Column 7 → 2 (Naked Single)
  6. Row 7 / Column 8 → 3 (Naked Single)
  7. Row 5 / Column 7 → 9 (Naked Single)
  8. Row 8 / Column 7 → 7 (Full House)
  9. Row 7 / Column 4 → 9 (Naked Single)
  10. Row 8 / Column 3 → 2 (Naked Single)
  11. Row 7 / Column 9 → 4 (Naked Single)
  12. Row 6 / Column 3 → 9 (Naked Single)
  13. Row 6 / Column 1 → 2 (Full House)
  14. Row 7 / Column 1 → 7 (Naked Single)
  15. Row 7 / Column 5 → 2 (Full House)
  16. Row 8 / Column 1 → 3 (Naked Single)
  17. Row 8 / Column 2 → 4 (Full House)
  18. Row 3 / Column 1 → 1 (Naked Single)
  19. Row 8 / Column 8 → 1 (Hidden Single)
  20. Row 5 / Column 9 → 2 (Hidden Single)
  21. Row 8 / Column 9 → 9 (Hidden Single)
  22. Row 9 / Column 5 → 4 (Hidden Single)
  23. Row 2 / Column 6 → 4 (Hidden Single)
  24. Row 8 / Column 5 → 6 (Hidden Single)
  25. Row 9 / Column 4 → 3 (Hidden Single)
  26. Row 2 / Column 2 → 2 (Hidden Single)
  27. Row 3 / Column 6 → 2 (Hidden Single)
  28. Locked Candidates Type 1 (Pointing): 6 in b3 => r2c13<>6
  29. Locked Candidates Type 1 (Pointing): 8 in b5 => r123c5<>8
  30. Row 3 / Column 9 → 8 (Hidden Single)
  31. Row 2 / Column 8 → 6 (Naked Single)
  32. Row 2 / Column 9 → 3 (Full House)
  33. Row 4 / Column 9 → 5 (Naked Single)
  34. Row 5 / Column 8 → 8 (Full House)
  35. Row 9 / Column 8 → 5 (Full House)
  36. Row 9 / Column 9 → 6 (Full House)
  37. Row 4 / Column 2 → 1 (Naked Single)
  38. Row 4 / Column 5 → 8 (Full House)
  39. Row 5 / Column 5 → 1 (Full House)
  40. Bivalue Universal Grave + 1 => r1c1<>6, r1c1<>9
  41. Row 1 / Column 1 → 5 (Naked Single)
  42. Row 1 / Column 2 → 3 (Naked Single)
  43. Row 1 / Column 6 → 8 (Naked Single)
  44. Row 8 / Column 6 → 5 (Full House)
  45. Row 8 / Column 4 → 8 (Full House)
  46. Row 2 / Column 4 → 5 (Full House)
  47. Row 2 / Column 1 → 9 (Naked Single)
  48. Row 5 / Column 1 → 6 (Full House)
  49. Row 1 / Column 5 → 9 (Naked Single)
  50. Row 1 / Column 3 → 6 (Full House)
  51. Row 3 / Column 2 → 7 (Naked Single)
  52. Row 2 / Column 3 → 8 (Full House)
  53. Row 2 / Column 5 → 7 (Full House)
  54. Row 5 / Column 3 → 7 (Full House)
  55. Row 3 / Column 5 → 3 (Full House)
  56. Row 5 / Column 2 → 5 (Full House)
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