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

This Sudoku Puzzle has 66 steps and it is solved using Hidden Single, undefined, Naked Pair, Locked Candidates Type 1 (Pointing), Naked Single, Naked Triple, Swordfish, 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 8 / Column 6 → 6 (Hidden Single)
  2. Row 2 / Column 6 → 7 (Hidden Single)
  3. X-Wing: 6 c39 r35 => r3c28,r5c1<>6
  4. Naked Pair: 1,2 in r3c28 => r3c3<>1, r3c356<>2
  5. Row 1 / Column 5 → 2 (Hidden Single)
  6. Locked Candidates Type 1 (Pointing): 3 in b2 => r6c4<>3
  7. Naked Pair: 6,8 in r1c28 => r1c1<>6, r1c17<>8
  8. Row 1 / Column 7 → 3 (Naked Single)
  9. Row 2 / Column 4 → 3 (Hidden Single)
  10. Naked Triple: 5,6,8 in r1c8,r23c9 => r2c7<>8
  11. Swordfish: 4 r349 c359 => r5c39,r7c5<>4
  12. Naked Triple: 5,6,8 in r235c9 => r489c9<>8
  13. Swordfish: 5 r167 c145 => r2c1,r39c5<>5
  14. Naked Pair: 2,8 in r28c1 => r57c1<>2, r7c1<>8
  15. Swordfish: 9 r349 c568 => r5c6,r6c58<>9
  16. Naked Triple: 2,6,8 in r5c369 => r5c7<>8
  17. Locked Candidates Type 2 (Claiming): 8 in c7 => r79c8<>8
  18. Row 9 / Column 8 → 9 (Naked Single)
  19. Row 8 / Column 4 → 9 (Hidden Single)
  20. Row 5 / Column 4 → 1 (Naked Single)
  21. Row 6 / Column 4 → 5 (Naked Single)
  22. Row 1 / Column 4 → 4 (Naked Single)
  23. Row 7 / Column 4 → 7 (Full House)
  24. Row 6 / Column 5 → 3 (Naked Single)
  25. Row 1 / Column 1 → 5 (Naked Single)
  26. Row 3 / Column 5 → 9 (Naked Single)
  27. Row 3 / Column 6 → 5 (Full House)
  28. Row 7 / Column 8 → 2 (Naked Single)
  29. Row 7 / Column 1 → 6 (Naked Single)
  30. Row 4 / Column 5 → 8 (Naked Single)
  31. Row 3 / Column 9 → 6 (Naked Single)
  32. Row 9 / Column 6 → 8 (Naked Single)
  33. Row 3 / Column 8 → 1 (Naked Single)
  34. Row 8 / Column 7 → 8 (Naked Single)
  35. Row 6 / Column 1 → 9 (Naked Single)
  36. Row 7 / Column 2 → 8 (Naked Single)
  37. Row 4 / Column 8 → 7 (Naked Single)
  38. Row 5 / Column 6 → 2 (Naked Single)
  39. Row 4 / Column 6 → 9 (Full House)
  40. Row 7 / Column 5 → 5 (Naked Single)
  41. Row 9 / Column 5 → 4 (Full House)
  42. Row 7 / Column 7 → 4 (Full House)
  43. Row 1 / Column 8 → 8 (Naked Single)
  44. Row 1 / Column 2 → 6 (Full House)
  45. Row 6 / Column 8 → 6 (Full House)
  46. Row 3 / Column 3 → 4 (Naked Single)
  47. Row 3 / Column 2 → 2 (Full House)
  48. Row 5 / Column 9 → 8 (Naked Single)
  49. Row 2 / Column 7 → 2 (Naked Single)
  50. Row 2 / Column 9 → 5 (Full House)
  51. Row 8 / Column 1 → 2 (Naked Single)
  52. Row 5 / Column 1 → 4 (Naked Single)
  53. Row 2 / Column 1 → 8 (Full House)
  54. Row 2 / Column 3 → 1 (Full House)
  55. Row 6 / Column 7 → 1 (Naked Single)
  56. Row 5 / Column 7 → 9 (Full House)
  57. Row 4 / Column 9 → 4 (Full House)
  58. Row 5 / Column 3 → 6 (Full House)
  59. Row 6 / Column 2 → 7 (Full House)
  60. Row 9 / Column 9 → 3 (Naked Single)
  61. Row 8 / Column 9 → 7 (Full House)
  62. Row 8 / Column 3 → 3 (Full House)
  63. Row 4 / Column 2 → 3 (Naked Single)
  64. Row 9 / Column 2 → 1 (Full House)
  65. Row 9 / Column 3 → 5 (Full House)
  66. Row 4 / Column 3 → 2 (Full House)
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