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

This Sudoku Puzzle has 66 steps and it is solved using Hidden Single, Locked Triple, Naked Single, Locked Candidates Type 1 (Pointing), Naked Pair, undefined, Full House techniques.

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

Solution Steps:

  1. Row 1 / Column 1 → 3 (Hidden Single)
  2. Row 7 / Column 3 → 6 (Hidden Single)
  3. Row 2 / Column 1 → 6 (Hidden Single)
  4. Row 5 / Column 1 → 5 (Hidden Single)
  5. Locked Triple: 3,6,8 in r456c5 => r5c4,r7c5<>3, r6c6,r8c5<>8, r5c4<>6
  6. Row 8 / Column 9 → 8 (Hidden Single)
  7. Row 9 / Column 9 → 1 (Naked Single)
  8. Row 7 / Column 2 → 1 (Hidden Single)
  9. Locked Candidates Type 1 (Pointing): 1 in b1 => r456c3<>1
  10. Locked Candidates Type 1 (Pointing): 2 in b7 => r8c7<>2
  11. Locked Candidates Type 1 (Pointing): 4 in b7 => r9c46<>4
  12. Locked Candidates Type 1 (Pointing): 5 in b9 => r23c7<>5
  13. Naked Pair: 2,5 in r2c49 => r2c237<>2, r2c25<>5
  14. Row 2 / Column 2 → 4 (Naked Single)
  15. Row 2 / Column 3 → 1 (Naked Single)
  16. Row 9 / Column 1 → 4 (Hidden Single)
  17. Locked Candidates Type 1 (Pointing): 5 in b2 => r7c4<>5
  18. W-Wing: 5/7 in r7c5,r8c7 connected by 7 in r2c57 => r7c7,r8c5<>5
  19. Row 7 / Column 5 → 5 (Hidden Single)
  20. Row 8 / Column 7 → 5 (Hidden Single)
  21. XY-Wing: 7/9/2 in r59c2,r8c1 => r46c1<>2
  22. Row 4 / Column 1 → 1 (Naked Single)
  23. Row 6 / Column 1 → 7 (Naked Single)
  24. Row 8 / Column 1 → 2 (Full House)
  25. Row 8 / Column 3 → 9 (Naked Single)
  26. Row 8 / Column 5 → 7 (Full House)
  27. Row 9 / Column 2 → 7 (Full House)
  28. Row 2 / Column 5 → 9 (Naked Single)
  29. Row 7 / Column 6 → 4 (Naked Single)
  30. Row 9 / Column 8 → 3 (Naked Single)
  31. Row 2 / Column 7 → 7 (Naked Single)
  32. Row 7 / Column 4 → 3 (Naked Single)
  33. Row 9 / Column 4 → 8 (Naked Single)
  34. Row 9 / Column 6 → 9 (Full House)
  35. Row 7 / Column 7 → 2 (Naked Single)
  36. Row 7 / Column 8 → 7 (Full House)
  37. Row 3 / Column 7 → 1 (Naked Single)
  38. Row 6 / Column 7 → 3 (Naked Single)
  39. Row 4 / Column 7 → 9 (Full House)
  40. Row 4 / Column 8 → 2 (Naked Single)
  41. Row 3 / Column 8 → 6 (Naked Single)
  42. Row 4 / Column 9 → 4 (Naked Single)
  43. Row 1 / Column 8 → 9 (Naked Single)
  44. Row 5 / Column 8 → 1 (Full House)
  45. Row 6 / Column 9 → 6 (Full House)
  46. Row 5 / Column 6 → 2 (Naked Single)
  47. Row 6 / Column 5 → 8 (Naked Single)
  48. Row 1 / Column 6 → 8 (Naked Single)
  49. Row 5 / Column 2 → 9 (Naked Single)
  50. Row 5 / Column 4 → 4 (Naked Single)
  51. Row 6 / Column 6 → 1 (Naked Single)
  52. Row 3 / Column 6 → 7 (Full House)
  53. Row 4 / Column 5 → 3 (Naked Single)
  54. Row 4 / Column 3 → 8 (Full House)
  55. Row 5 / Column 5 → 6 (Full House)
  56. Row 5 / Column 3 → 3 (Full House)
  57. Row 6 / Column 2 → 2 (Naked Single)
  58. Row 6 / Column 3 → 4 (Full House)
  59. Row 3 / Column 3 → 2 (Full House)
  60. Row 1 / Column 2 → 5 (Naked Single)
  61. Row 3 / Column 2 → 8 (Full House)
  62. Row 3 / Column 4 → 5 (Full House)
  63. Row 1 / Column 9 → 2 (Naked Single)
  64. Row 1 / Column 4 → 6 (Full House)
  65. Row 2 / Column 4 → 2 (Full House)
  66. Row 2 / Column 9 → 5 (Full House)
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