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1

This Sudoku Puzzle has 67 steps and it is solved using Hidden Single, Naked Single, Full House, Locked Candidates Type 1 (Pointing), Naked Pair, Naked Triple, undefined, Turbot Fish techniques.

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

Solution Steps:

  1. Row 7 / Column 1 → 8 (Hidden Single)
  2. Row 9 / Column 7 → 8 (Hidden Single)
  3. Row 7 / Column 2 → 4 (Hidden Single)
  4. Row 1 / Column 9 → 4 (Hidden Single)
  5. Row 3 / Column 1 → 4 (Hidden Single)
  6. Row 1 / Column 8 → 5 (Hidden Single)
  7. Row 2 / Column 9 → 8 (Hidden Single)
  8. Row 2 / Column 1 → 9 (Hidden Single)
  9. Row 3 / Column 8 → 1 (Hidden Single)
  10. Row 3 / Column 2 → 7 (Naked Single)
  11. Row 1 / Column 2 → 1 (Naked Single)
  12. Row 2 / Column 3 → 6 (Full House)
  13. Row 1 / Column 4 → 7 (Naked Single)
  14. Row 2 / Column 5 → 1 (Naked Single)
  15. Row 2 / Column 4 → 2 (Naked Single)
  16. Row 2 / Column 7 → 7 (Full House)
  17. Row 1 / Column 5 → 6 (Hidden Single)
  18. Row 1 / Column 6 → 8 (Full House)
  19. Row 5 / Column 5 → 8 (Hidden Single)
  20. Locked Candidates Type 1 (Pointing): 1 in b5 => r4c13<>1
  21. Locked Candidates Type 1 (Pointing): 1 in b7 => r8c6<>1
  22. Naked Pair: 3,9 in r39c4 => r45c4<>3, r5c4<>9
  23. Naked Triple: 2,5,6 in r378c7 => r4c7<>2, r46c7<>5, r4c7<>6
  24. Locked Candidates Type 1 (Pointing): 5 in b6 => r8c9<>5
  25. X-Wing: 2 c28 r59 => r5c39,r9c3<>2
  26. Row 9 / Column 3 → 7 (Naked Single)
  27. Naked Pair: 4,5 in r5c34 => r5c69<>5
  28. Naked Triple: 3,7,9 in r46c5,r5c6 => r4c6<>3, r4c6<>7
  29. Turbot Fish: 9 r6c5 =9= r8c5 -9- r8c9 =9= r9c8 => r6c8<>9
  30. Row 6 / Column 8 → 7 (Naked Single)
  31. Row 7 / Column 8 → 6 (Naked Single)
  32. Row 7 / Column 7 → 5 (Naked Single)
  33. Row 7 / Column 4 → 1 (Naked Single)
  34. Row 7 / Column 6 → 7 (Full House)
  35. Row 8 / Column 7 → 2 (Naked Single)
  36. Row 3 / Column 7 → 6 (Naked Single)
  37. Row 3 / Column 9 → 2 (Full House)
  38. Row 8 / Column 3 → 1 (Naked Single)
  39. Row 9 / Column 8 → 9 (Naked Single)
  40. Row 5 / Column 8 → 2 (Full House)
  41. Row 8 / Column 9 → 7 (Full House)
  42. Row 8 / Column 1 → 3 (Naked Single)
  43. Row 9 / Column 2 → 2 (Full House)
  44. Row 5 / Column 2 → 3 (Full House)
  45. Row 9 / Column 4 → 3 (Naked Single)
  46. Row 9 / Column 6 → 6 (Full House)
  47. Row 6 / Column 1 → 1 (Naked Single)
  48. Row 8 / Column 5 → 9 (Naked Single)
  49. Row 8 / Column 6 → 5 (Full House)
  50. Row 5 / Column 6 → 9 (Naked Single)
  51. Row 3 / Column 4 → 9 (Naked Single)
  52. Row 3 / Column 6 → 3 (Full House)
  53. Row 4 / Column 6 → 1 (Full House)
  54. Row 6 / Column 5 → 3 (Naked Single)
  55. Row 4 / Column 5 → 7 (Full House)
  56. Row 5 / Column 9 → 6 (Naked Single)
  57. Row 6 / Column 7 → 4 (Naked Single)
  58. Row 4 / Column 7 → 3 (Full House)
  59. Row 4 / Column 1 → 6 (Naked Single)
  60. Row 5 / Column 1 → 7 (Full House)
  61. Row 4 / Column 9 → 5 (Naked Single)
  62. Row 6 / Column 9 → 9 (Full House)
  63. Row 6 / Column 3 → 5 (Full House)
  64. Row 4 / Column 4 → 4 (Naked Single)
  65. Row 4 / Column 3 → 2 (Full House)
  66. Row 5 / Column 3 → 4 (Full House)
  67. Row 5 / Column 4 → 5 (Full House)
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