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.

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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