Solution for Hard Sudoku #447713524895

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

This Sudoku Puzzle has 58 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Naked Single, Locked Pair, Full House techniques.

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Solution Steps:

  1. Row 3 / Column 5 → 2 (Hidden Single)
  2. Row 2 / Column 9 → 8 (Hidden Single)
  3. Row 5 / Column 3 → 7 (Hidden Single)
  4. Row 9 / Column 9 → 9 (Hidden Single)
  5. Row 8 / Column 1 → 8 (Hidden Single)
  6. Row 7 / Column 3 → 9 (Hidden Single)
  7. Row 8 / Column 3 → 3 (Hidden Single)
  8. Row 9 / Column 3 → 2 (Hidden Single)
  9. Locked Candidates Type 1 (Pointing): 6 in b5 => r5c12789<>6
  10. Locked Candidates Type 1 (Pointing): 8 in b5 => r5c28<>8
  11. Locked Candidates Type 1 (Pointing): 9 in b5 => r5c12<>9
  12. Locked Candidates Type 1 (Pointing): 5 in b7 => r7c68<>5
  13. Locked Candidates Type 1 (Pointing): 6 in b7 => r7c568<>6
  14. Row 7 / Column 5 → 4 (Naked Single)
  15. Row 7 / Column 6 → 2 (Naked Single)
  16. Row 7 / Column 8 → 2 (Naked Single)
  17. Locked Pair: 5,6 in r8c46 => r8c79,r9c4<>5, r8c79,r9c45<>6
  18. Row 9 / Column 4 → 8 (Naked Single)
  19. Row 9 / Column 5 → 8 (Naked Single)
  20. Row 1 / Column 5 → 6 (Naked Single)
  21. Row 9 / Column 8 → 5 (Hidden Single)
  22. Row 5 / Column 6 → 8 (Hidden Single)
  23. Row 5 / Column 4 → 6 (Hidden Single)
  24. Row 8 / Column 4 → 5 (Naked Single)
  25. Row 2 / Column 4 → 4 (Naked Single)
  26. Row 3 / Column 4 → 9 (Full House)
  27. Row 8 / Column 6 → 6 (Naked Single)
  28. Row 2 / Column 3 → 6 (Naked Single)
  29. Row 4 / Column 3 → 4 (Full House)
  30. Row 1 / Column 6 → 1 (Naked Single)
  31. Row 2 / Column 6 → 5 (Full House)
  32. Row 5 / Column 2 → 3 (Naked Single)
  33. Row 1 / Column 1 → 9 (Naked Single)
  34. Row 1 / Column 7 → 4 (Full House)
  35. Row 1 / Column 2 → 4 (Full House)
  36. Row 3 / Column 2 → 4 (Naked Single)
  37. Row 5 / Column 1 → 2 (Naked Single)
  38. Row 8 / Column 7 → 1 (Naked Single)
  39. Row 8 / Column 9 → 4 (Full House)
  40. Row 5 / Column 7 → 1 (Naked Single)
  41. Row 2 / Column 7 → 3 (Naked Single)
  42. Row 2 / Column 1 → 1 (Full House)
  43. Row 5 / Column 9 → 1 (Naked Single)
  44. Row 5 / Column 8 → 4 (Naked Single)
  45. Row 4 / Column 8 → 3 (Hidden Single)
  46. Row 6 / Column 2 → 9 (Hidden Single)
  47. Row 6 / Column 7 → 2 (Hidden Single)
  48. Row 3 / Column 8 → 1 (Hidden Single)
  49. Row 4 / Column 2 → 8 (Hidden Single)
  50. Row 6 / Column 8 → 8 (Hidden Single)
  51. Row 3 / Column 7 → 5 (Hidden Single)
  52. Row 3 / Column 9 → 6 (Full House)
  53. Row 4 / Column 9 → 5 (Naked Single)
  54. Row 4 / Column 1 → 6 (Full House)
  55. Row 6 / Column 9 → 5 (Full House)
  56. Row 6 / Column 1 → 5 (Full House)
  57. Row 7 / Column 1 → 5 (Full House)
  58. Row 7 / Column 2 → 6 (Naked Single)
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