Solution for Hard Sudoku #2213798426518

3
9
2
4
8
1
5
6
1
5
3
6
2
4
5
6
5
7
7
9
6
1
8
1
6
4
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 2 → 3 (Hidden Single)
  2. Locked Triple: 3,7,9 in r3c456 => r1c5,r2c46,r3c37<>7, r1c5,r3c7<>9, r2c46<>3
  3. Row 1 / Column 5 → 2 (Naked Single)
  4. Row 7 / Column 5 → 3 (Naked Single)
  5. Locked Candidates Type 1 (Pointing): 4 in b2 => r2c78<>4
  6. Locked Candidates Type 1 (Pointing): 6 in b2 => r2c2<>6
  7. Locked Candidates Type 1 (Pointing): 4 in b8 => r7c3<>4
  8. Naked Pair: 7,9 in r39c5 => r4c5<>7, r46c5<>9
  9. X-Wing: 8 r37 c37 => r2c37,r458c3,r568c7<>8
  10. Skyscraper: 8 in r5c2,r8c1 (connected by r58c8) => r46c1<>8
  11. Row 8 / Column 1 → 8 (Hidden Single)
  12. Row 7 / Column 7 → 8 (Hidden Single)
  13. Row 3 / Column 7 → 5 (Naked Single)
  14. Row 3 / Column 3 → 8 (Naked Single)
  15. Row 8 / Column 3 → 1 (Hidden Single)
  16. Row 2 / Column 3 → 7 (Naked Single)
  17. Row 1 / Column 2 → 6 (Naked Single)
  18. Row 2 / Column 2 → 1 (Naked Single)
  19. Row 1 / Column 1 → 5 (Full House)
  20. Row 2 / Column 7 → 2 (Naked Single)
  21. Row 9 / Column 2 → 2 (Naked Single)
  22. Row 6 / Column 2 → 8 (Naked Single)
  23. Row 5 / Column 2 → 7 (Full House)
  24. Row 7 / Column 3 → 5 (Naked Single)
  25. Row 6 / Column 5 → 1 (Naked Single)
  26. Row 7 / Column 6 → 4 (Naked Single)
  27. Row 7 / Column 4 → 2 (Full House)
  28. Row 9 / Column 3 → 4 (Naked Single)
  29. Row 9 / Column 1 → 6 (Full House)
  30. Row 4 / Column 5 → 8 (Naked Single)
  31. Row 6 / Column 1 → 4 (Naked Single)
  32. Row 4 / Column 1 → 1 (Full House)
  33. Row 2 / Column 6 → 6 (Naked Single)
  34. Row 4 / Column 3 → 9 (Naked Single)
  35. Row 5 / Column 3 → 2 (Full House)
  36. Row 6 / Column 7 → 9 (Naked Single)
  37. Row 2 / Column 4 → 4 (Naked Single)
  38. Row 5 / Column 6 → 9 (Naked Single)
  39. Row 4 / Column 9 → 3 (Naked Single)
  40. Row 5 / Column 7 → 1 (Naked Single)
  41. Row 5 / Column 8 → 8 (Naked Single)
  42. Row 5 / Column 4 → 6 (Full House)
  43. Row 6 / Column 6 → 3 (Naked Single)
  44. Row 4 / Column 4 → 7 (Full House)
  45. Row 4 / Column 8 → 4 (Full House)
  46. Row 6 / Column 9 → 2 (Full House)
  47. Row 8 / Column 7 → 7 (Naked Single)
  48. Row 1 / Column 7 → 4 (Full House)
  49. Row 2 / Column 9 → 8 (Naked Single)
  50. Row 2 / Column 8 → 3 (Full House)
  51. Row 3 / Column 6 → 7 (Naked Single)
  52. Row 8 / Column 6 → 5 (Full House)
  53. Row 8 / Column 4 → 9 (Naked Single)
  54. Row 3 / Column 4 → 3 (Full House)
  55. Row 3 / Column 5 → 9 (Full House)
  56. Row 8 / Column 8 → 2 (Full House)
  57. Row 9 / Column 5 → 7 (Full House)
  58. Row 1 / Column 8 → 9 (Naked Single)
  59. Row 1 / Column 9 → 7 (Full House)
  60. Row 9 / Column 9 → 9 (Full House)
  61. Row 9 / Column 8 → 5 (Full House)
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