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

This Sudoku Puzzle has 67 steps and it is solved using Naked Single, Hidden Single, Locked Candidates Type 1 (Pointing), undefined, Naked Triple, Locked Candidates Type 2 (Claiming), Full House techniques.

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

Solution Steps:

  1. Row 3 / Column 3 → 7 (Naked Single)
  2. Row 1 / Column 5 → 3 (Hidden Single)
  3. Row 3 / Column 7 → 5 (Hidden Single)
  4. Row 9 / Column 4 → 4 (Hidden Single)
  5. Row 1 / Column 9 → 7 (Hidden Single)
  6. Row 3 / Column 5 → 1 (Hidden Single)
  7. Row 3 / Column 6 → 8 (Hidden Single)
  8. Locked Candidates Type 1 (Pointing): 2 in b2 => r2c2<>2
  9. Locked Candidates Type 1 (Pointing): 9 in b2 => r2c28<>9
  10. Row 8 / Column 2 → 9 (Hidden Single)
  11. Locked Candidates Type 1 (Pointing): 6 in b3 => r78c8<>6
  12. Locked Candidates Type 1 (Pointing): 8 in b8 => r56c5<>8
  13. X-Wing: 4 r26 c28 => r7c8<>4
  14. Row 7 / Column 8 → 5 (Naked Single)
  15. Row 8 / Column 8 → 1 (Naked Single)
  16. Row 4 / Column 2 → 5 (Hidden Single)
  17. Row 9 / Column 3 → 5 (Hidden Single)
  18. Row 8 / Column 5 → 5 (Hidden Single)
  19. Row 1 / Column 7 → 1 (Hidden Single)
  20. Row 7 / Column 3 → 3 (Hidden Single)
  21. Locked Candidates Type 1 (Pointing): 8 in b7 => r5c1<>8
  22. Naked Triple: 2,4,6 in r7c279 => r7c15<>2, r7c15<>6
  23. XY-Chain: 6 6- r1c3 -2- r4c3 -8- r4c8 -9- r1c8 -6 => r1c1<>6
  24. XY-Chain: 2 2- r1c1 -9- r3c1 -4- r2c2 -6- r7c2 -2 => r89c1<>2
  25. Row 7 / Column 2 → 2 (Hidden Single)
  26. Row 7 / Column 7 → 4 (Naked Single)
  27. Row 7 / Column 9 → 6 (Naked Single)
  28. Locked Candidates Type 1 (Pointing): 6 in b7 => r5c1<>6
  29. Locked Candidates Type 2 (Claiming): 2 in r6 => r4c46,r5c45<>2
  30. W-Wing: 2/9 in r1c1,r5c7 connected by 9 in r14c8 => r5c1<>2
  31. Row 5 / Column 1 → 4 (Naked Single)
  32. Row 3 / Column 1 → 9 (Naked Single)
  33. Row 3 / Column 9 → 4 (Full House)
  34. Row 6 / Column 2 → 6 (Naked Single)
  35. Row 2 / Column 2 → 4 (Full House)
  36. Row 1 / Column 1 → 2 (Naked Single)
  37. Row 1 / Column 3 → 6 (Full House)
  38. Row 1 / Column 8 → 9 (Full House)
  39. Row 2 / Column 8 → 6 (Full House)
  40. Row 6 / Column 5 → 2 (Naked Single)
  41. Row 4 / Column 8 → 8 (Naked Single)
  42. Row 6 / Column 8 → 4 (Full House)
  43. Row 6 / Column 6 → 3 (Naked Single)
  44. Row 6 / Column 4 → 8 (Full House)
  45. Row 4 / Column 3 → 2 (Naked Single)
  46. Row 5 / Column 3 → 8 (Full House)
  47. Row 5 / Column 4 → 1 (Naked Single)
  48. Row 4 / Column 4 → 7 (Naked Single)
  49. Row 2 / Column 4 → 2 (Naked Single)
  50. Row 8 / Column 4 → 3 (Full House)
  51. Row 4 / Column 6 → 9 (Naked Single)
  52. Row 4 / Column 9 → 1 (Full House)
  53. Row 5 / Column 5 → 6 (Full House)
  54. Row 8 / Column 9 → 2 (Naked Single)
  55. Row 2 / Column 6 → 7 (Naked Single)
  56. Row 2 / Column 5 → 9 (Full House)
  57. Row 9 / Column 5 → 8 (Naked Single)
  58. Row 7 / Column 5 → 7 (Full House)
  59. Row 7 / Column 1 → 8 (Full House)
  60. Row 5 / Column 9 → 9 (Naked Single)
  61. Row 5 / Column 7 → 2 (Full House)
  62. Row 9 / Column 7 → 9 (Full House)
  63. Row 9 / Column 9 → 3 (Full House)
  64. Row 8 / Column 6 → 6 (Naked Single)
  65. Row 8 / Column 1 → 7 (Full House)
  66. Row 9 / Column 1 → 6 (Full House)
  67. Row 9 / Column 6 → 2 (Full House)
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