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

This Sudoku Puzzle has 69 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Single, Locked Pair, Naked Pair, Empty Rectangle, undefined, 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 7 → 2 (Hidden Single)
  2. Row 7 / Column 8 → 5 (Hidden Single)
  3. Row 9 / Column 7 → 6 (Hidden Single)
  4. Row 9 / Column 9 → 4 (Hidden Single)
  5. Locked Candidates Type 1 (Pointing): 6 in b2 => r1c1<>6
  6. Locked Candidates Type 1 (Pointing): 5 in b3 => r1c2<>5
  7. Locked Candidates Type 1 (Pointing): 9 in b6 => r12c9<>9
  8. Locked Candidates Type 1 (Pointing): 1 in b9 => r8c3<>1
  9. Locked Candidates Type 2 (Claiming): 9 in r2 => r1c12,r3c23<>9
  10. Row 1 / Column 1 → 7 (Naked Single)
  11. Row 1 / Column 2 → 1 (Naked Single)
  12. Row 1 / Column 9 → 5 (Naked Single)
  13. Row 3 / Column 6 → 1 (Hidden Single)
  14. Row 7 / Column 3 → 1 (Hidden Single)
  15. Locked Pair: 5,8 in r3c23 => r2c13,r3c8<>8
  16. Naked Pair: 3,7 in r38c5 => r246c5<>7, r46c5<>3
  17. Row 2 / Column 5 → 4 (Naked Single)
  18. Row 7 / Column 4 → 4 (Hidden Single)
  19. Row 1 / Column 7 → 4 (Hidden Single)
  20. Row 4 / Column 6 → 4 (Hidden Single)
  21. Row 9 / Column 4 → 2 (Hidden Single)
  22. Locked Candidates Type 1 (Pointing): 7 in b2 => r3c8<>7
  23. Locked Candidates Type 1 (Pointing): 3 in b3 => r5c8<>3
  24. Empty Rectangle: 7 in b5 (r59c8) => r9c6<>7
  25. Empty Rectangle: 7 in b5 (r7c26) => r5c2<>7
  26. Naked Pair: 5,8 in r35c2 => r4c2<>5, r79c2<>8
  27. W-Wing: 7/8 in r5c8,r7c6 connected by 8 in r9c68 => r5c6<>7
  28. XY-Wing: 8/9/7 in r79c6,r9c2 => r7c2<>7
  29. Row 7 / Column 2 → 2 (Naked Single)
  30. Row 7 / Column 1 → 8 (Naked Single)
  31. Row 7 / Column 6 → 7 (Full House)
  32. Row 6 / Column 6 → 3 (Naked Single)
  33. Row 8 / Column 5 → 3 (Naked Single)
  34. Row 5 / Column 6 → 6 (Naked Single)
  35. Row 3 / Column 5 → 7 (Naked Single)
  36. Row 8 / Column 4 → 9 (Naked Single)
  37. Row 9 / Column 6 → 8 (Full House)
  38. Row 1 / Column 6 → 9 (Full House)
  39. Row 5 / Column 4 → 7 (Naked Single)
  40. Row 3 / Column 4 → 3 (Naked Single)
  41. Row 1 / Column 4 → 6 (Full House)
  42. Row 1 / Column 8 → 3 (Full House)
  43. Row 8 / Column 1 → 6 (Naked Single)
  44. Row 9 / Column 8 → 7 (Naked Single)
  45. Row 9 / Column 2 → 9 (Full House)
  46. Row 8 / Column 3 → 7 (Full House)
  47. Row 5 / Column 8 → 8 (Naked Single)
  48. Row 3 / Column 8 → 9 (Full House)
  49. Row 2 / Column 1 → 9 (Naked Single)
  50. Row 4 / Column 2 → 7 (Naked Single)
  51. Row 5 / Column 2 → 5 (Naked Single)
  52. Row 3 / Column 2 → 8 (Full House)
  53. Row 5 / Column 7 → 3 (Full House)
  54. Row 3 / Column 3 → 5 (Full House)
  55. Row 2 / Column 3 → 6 (Full House)
  56. Row 6 / Column 1 → 2 (Naked Single)
  57. Row 4 / Column 1 → 3 (Full House)
  58. Row 4 / Column 3 → 9 (Naked Single)
  59. Row 6 / Column 3 → 8 (Full House)
  60. Row 6 / Column 5 → 5 (Naked Single)
  61. Row 4 / Column 5 → 2 (Full House)
  62. Row 4 / Column 9 → 1 (Naked Single)
  63. Row 4 / Column 7 → 5 (Full House)
  64. Row 6 / Column 7 → 7 (Naked Single)
  65. Row 6 / Column 9 → 9 (Full House)
  66. Row 8 / Column 9 → 8 (Naked Single)
  67. Row 2 / Column 9 → 7 (Full House)
  68. Row 2 / Column 7 → 8 (Full House)
  69. Row 8 / Column 7 → 1 (Full House)
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