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

This Sudoku Puzzle has 72 steps and it is solved using Naked Single, Hidden Single, Locked Candidates Type 1 (Pointing), Full House, Naked Pair, Naked Triple, Hidden Pair, undefined techniques.

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

Solution Steps:

  1. Row 1 / Column 6 → 2 (Naked Single)
  2. Row 1 / Column 1 → 9 (Hidden Single)
  3. Row 4 / Column 6 → 9 (Hidden Single)
  4. Row 8 / Column 6 → 7 (Hidden Single)
  5. Row 6 / Column 6 → 4 (Hidden Single)
  6. Locked Candidates Type 1 (Pointing): 1 in b2 => r56c5<>1
  7. Locked Candidates Type 1 (Pointing): 5 in b2 => r79c5<>5
  8. Locked Candidates Type 1 (Pointing): 4 in b3 => r3c123<>4
  9. Locked Candidates Type 1 (Pointing): 6 in b3 => r3c56<>6
  10. Row 3 / Column 6 → 8 (Naked Single)
  11. Row 2 / Column 6 → 6 (Full House)
  12. Row 3 / Column 1 → 3 (Naked Single)
  13. Row 2 / Column 4 → 3 (Naked Single)
  14. Row 2 / Column 8 → 2 (Naked Single)
  15. Row 3 / Column 2 → 2 (Hidden Single)
  16. Locked Candidates Type 1 (Pointing): 5 in b1 => r4c3<>5
  17. Locked Candidates Type 1 (Pointing): 7 in b1 => r79c3<>7
  18. Locked Candidates Type 1 (Pointing): 6 in b7 => r9c45<>6
  19. Locked Candidates Type 1 (Pointing): 5 in b9 => r6c7<>5
  20. Naked Pair: 4,8 in r27c1 => r5c1<>4, r59c1<>8
  21. Naked Triple: 1,3,7 in r1c79,r3c8 => r3c79<>7, r3c9<>1
  22. Hidden Pair: 2,5 in r79c7 => r7c7<>3, r79c7<>7, r79c7<>8
  23. Locked Candidates Type 1 (Pointing): 7 in b9 => r145c9<>7
  24. XY-Wing: 1/7/3 in r1c7,r38c8 => r8c7<>3
  25. Row 8 / Column 7 → 8 (Naked Single)
  26. Row 8 / Column 4 → 6 (Naked Single)
  27. Row 4 / Column 4 → 7 (Naked Single)
  28. Row 6 / Column 4 → 1 (Naked Single)
  29. Row 5 / Column 4 → 2 (Naked Single)
  30. Row 6 / Column 2 → 8 (Hidden Single)
  31. Row 2 / Column 2 → 4 (Naked Single)
  32. Row 2 / Column 1 → 8 (Full House)
  33. Row 7 / Column 1 → 4 (Naked Single)
  34. Row 5 / Column 9 → 8 (Hidden Single)
  35. Row 3 / Column 8 → 7 (Hidden Single)
  36. Row 1 / Column 7 → 3 (Naked Single)
  37. Row 3 / Column 3 → 5 (Naked Single)
  38. Row 1 / Column 3 → 7 (Full House)
  39. Row 1 / Column 9 → 1 (Naked Single)
  40. Row 1 / Column 5 → 5 (Full House)
  41. Row 3 / Column 5 → 1 (Full House)
  42. Row 6 / Column 7 → 6 (Naked Single)
  43. Row 3 / Column 7 → 4 (Naked Single)
  44. Row 3 / Column 9 → 6 (Full House)
  45. Row 6 / Column 5 → 3 (Naked Single)
  46. Row 5 / Column 5 → 6 (Full House)
  47. Row 6 / Column 8 → 5 (Full House)
  48. Row 5 / Column 7 → 7 (Naked Single)
  49. Row 5 / Column 1 → 1 (Naked Single)
  50. Row 9 / Column 1 → 6 (Full House)
  51. Row 4 / Column 8 → 3 (Naked Single)
  52. Row 4 / Column 9 → 4 (Full House)
  53. Row 8 / Column 8 → 1 (Full House)
  54. Row 5 / Column 2 → 3 (Naked Single)
  55. Row 5 / Column 3 → 4 (Full House)
  56. Row 9 / Column 3 → 8 (Naked Single)
  57. Row 4 / Column 2 → 5 (Naked Single)
  58. Row 4 / Column 3 → 6 (Full House)
  59. Row 7 / Column 3 → 3 (Full House)
  60. Row 8 / Column 2 → 9 (Naked Single)
  61. Row 9 / Column 4 → 5 (Naked Single)
  62. Row 7 / Column 4 → 8 (Full House)
  63. Row 7 / Column 2 → 7 (Naked Single)
  64. Row 9 / Column 2 → 1 (Full House)
  65. Row 8 / Column 5 → 4 (Naked Single)
  66. Row 8 / Column 9 → 3 (Full House)
  67. Row 9 / Column 7 → 2 (Naked Single)
  68. Row 7 / Column 7 → 5 (Full House)
  69. Row 7 / Column 9 → 9 (Naked Single)
  70. Row 7 / Column 5 → 2 (Full House)
  71. Row 9 / Column 5 → 9 (Full House)
  72. Row 9 / Column 9 → 7 (Full House)
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