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

This Sudoku Puzzle has 65 steps and it is solved using Hidden Pair, Hidden Single, Naked Single, Full House, Locked Triple, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Pair, Naked Triple techniques.

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

Solution Steps:

  1. Hidden Pair: 3,9 in r8c18 => r8c1<>1, r8c18<>6, r8c8<>7
  2. Row 8 / Column 9 → 7 (Hidden Single)
  3. Row 9 / Column 7 → 2 (Hidden Single)
  4. Row 7 / Column 7 → 1 (Hidden Single)
  5. Row 5 / Column 7 → 3 (Hidden Single)
  6. Row 4 / Column 6 → 3 (Hidden Single)
  7. Row 5 / Column 3 → 8 (Hidden Single)
  8. Row 7 / Column 2 → 8 (Hidden Single)
  9. Row 3 / Column 3 → 4 (Hidden Single)
  10. Row 7 / Column 8 → 9 (Hidden Single)
  11. Row 8 / Column 8 → 3 (Naked Single)
  12. Row 8 / Column 1 → 9 (Naked Single)
  13. Row 4 / Column 2 → 9 (Hidden Single)
  14. Row 2 / Column 9 → 4 (Hidden Single)
  15. Row 7 / Column 9 → 6 (Naked Single)
  16. Row 9 / Column 8 → 4 (Full House)
  17. Row 7 / Column 4 → 5 (Naked Single)
  18. Row 7 / Column 6 → 4 (Full House)
  19. Row 5 / Column 4 → 9 (Naked Single)
  20. Row 9 / Column 2 → 3 (Hidden Single)
  21. Locked Triple: 1,2,4 in r456c1 => r2c1,r4c3,r6c2<>1, r3c1<>2
  22. Locked Candidates Type 1 (Pointing): 5 in b3 => r46c8<>5
  23. Locked Candidates Type 1 (Pointing): 1 in b7 => r1c3<>1
  24. Locked Candidates Type 2 (Claiming): 7 in r5 => r46c5<>7
  25. Naked Pair: 5,7 in r1c38 => r1c25<>5, r1c257<>7
  26. Row 1 / Column 7 → 9 (Naked Single)
  27. Row 3 / Column 5 → 9 (Hidden Single)
  28. Naked Triple: 1,2,3 in r1c5,r23c4 => r2c56<>1
  29. Row 8 / Column 6 → 1 (Hidden Single)
  30. Row 8 / Column 3 → 6 (Naked Single)
  31. Row 9 / Column 3 → 1 (Full House)
  32. Row 9 / Column 5 → 6 (Full House)
  33. Row 8 / Column 4 → 2 (Naked Single)
  34. Row 8 / Column 5 → 8 (Full House)
  35. Row 3 / Column 4 → 3 (Naked Single)
  36. Row 2 / Column 4 → 1 (Naked Single)
  37. Row 6 / Column 4 → 6 (Full House)
  38. Row 3 / Column 1 → 6 (Naked Single)
  39. Row 1 / Column 5 → 2 (Naked Single)
  40. Row 2 / Column 1 → 3 (Naked Single)
  41. Row 1 / Column 2 → 1 (Naked Single)
  42. Row 4 / Column 8 → 6 (Hidden Single)
  43. Row 3 / Column 2 → 2 (Hidden Single)
  44. Row 2 / Column 7 → 6 (Hidden Single)
  45. Row 4 / Column 3 → 7 (Hidden Single)
  46. Row 1 / Column 3 → 5 (Full House)
  47. Row 1 / Column 8 → 7 (Full House)
  48. Row 2 / Column 2 → 7 (Full House)
  49. Row 6 / Column 2 → 5 (Full House)
  50. Row 3 / Column 7 → 8 (Naked Single)
  51. Row 3 / Column 8 → 5 (Full House)
  52. Row 6 / Column 8 → 8 (Full House)
  53. Row 6 / Column 7 → 7 (Full House)
  54. Row 3 / Column 6 → 7 (Full House)
  55. Row 2 / Column 5 → 5 (Naked Single)
  56. Row 2 / Column 6 → 8 (Full House)
  57. Row 5 / Column 6 → 5 (Full House)
  58. Row 4 / Column 5 → 1 (Naked Single)
  59. Row 5 / Column 9 → 2 (Naked Single)
  60. Row 4 / Column 9 → 5 (Full House)
  61. Row 4 / Column 1 → 2 (Full House)
  62. Row 6 / Column 5 → 4 (Naked Single)
  63. Row 5 / Column 5 → 7 (Full House)
  64. Row 5 / Column 1 → 4 (Full House)
  65. Row 6 / Column 1 → 1 (Full House)
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