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

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

Try To Solve This Puzzle

Solution Steps:

  1. Row 5 / Column 1 → 1 (Hidden Single)
  2. Row 4 / Column 3 → 2 (Hidden Single)
  3. Locked Candidates Type 2 (Claiming): 7 in c5 => r4c6,r6c4<>7
  4. Naked Triple: 4,6,9 in r128c1 => r67c1<>4, r67c1<>6, r7c1<>9
  5. Locked Candidates Type 1 (Pointing): 6 in b4 => r179c2<>6
  6. Hidden Pair: 5,8 in r3c23 => r3c23<>3, r3c23<>4, r3c2<>9
  7. Swordfish: 3 r258 c346 => r17c4,r3c6<>3
  8. Swordfish: 5 r349 c239 => r5c39,r67c2<>5
  9. Row 5 / Column 9 → 9 (Naked Single)
  10. Swordfish: 8 r349 c236 => r5c36,r67c2<>8
  11. Row 5 / Column 3 → 4 (Naked Single)
  12. Row 5 / Column 6 → 3 (Naked Single)
  13. Row 6 / Column 2 → 6 (Naked Single)
  14. Naked Pair: 5,8 in r34c2 => r9c2<>5, r9c2<>8
  15. Naked Pair: 3,6 in r28c3 => r9c3<>6
  16. Locked Candidates Type 1 (Pointing): 6 in b7 => r8c679<>6
  17. Naked Pair: 1,4 in r38c9 => r29c9<>4, r4c9<>1
  18. Row 4 / Column 9 → 5 (Naked Single)
  19. Row 4 / Column 2 → 8 (Naked Single)
  20. Row 6 / Column 1 → 5 (Full House)
  21. Row 5 / Column 7 → 8 (Naked Single)
  22. Row 5 / Column 4 → 5 (Full House)
  23. Row 3 / Column 2 → 5 (Naked Single)
  24. Row 4 / Column 6 → 6 (Naked Single)
  25. Row 7 / Column 1 → 8 (Naked Single)
  26. Row 6 / Column 7 → 2 (Naked Single)
  27. Row 3 / Column 3 → 8 (Naked Single)
  28. Row 4 / Column 5 → 7 (Naked Single)
  29. Row 4 / Column 8 → 1 (Full House)
  30. Row 6 / Column 8 → 7 (Full House)
  31. Row 7 / Column 4 → 4 (Naked Single)
  32. Row 9 / Column 3 → 5 (Naked Single)
  33. Row 6 / Column 5 → 4 (Naked Single)
  34. Row 6 / Column 4 → 8 (Full House)
  35. Row 1 / Column 4 → 2 (Naked Single)
  36. Row 7 / Column 8 → 9 (Naked Single)
  37. Row 7 / Column 2 → 3 (Naked Single)
  38. Row 8 / Column 7 → 1 (Naked Single)
  39. Row 7 / Column 5 → 6 (Naked Single)
  40. Row 7 / Column 7 → 5 (Full House)
  41. Row 8 / Column 3 → 6 (Naked Single)
  42. Row 2 / Column 3 → 3 (Full House)
  43. Row 8 / Column 9 → 4 (Naked Single)
  44. Row 9 / Column 5 → 9 (Naked Single)
  45. Row 2 / Column 4 → 7 (Naked Single)
  46. Row 8 / Column 4 → 3 (Full House)
  47. Row 3 / Column 9 → 1 (Naked Single)
  48. Row 8 / Column 1 → 9 (Naked Single)
  49. Row 8 / Column 6 → 7 (Full House)
  50. Row 9 / Column 2 → 4 (Full House)
  51. Row 9 / Column 6 → 8 (Full House)
  52. Row 1 / Column 2 → 9 (Full House)
  53. Row 9 / Column 8 → 2 (Naked Single)
  54. Row 9 / Column 9 → 6 (Full House)
  55. Row 2 / Column 9 → 2 (Full House)
  56. Row 3 / Column 5 → 3 (Naked Single)
  57. Row 1 / Column 5 → 1 (Full House)
  58. Row 1 / Column 7 → 6 (Naked Single)
  59. Row 2 / Column 7 → 9 (Full House)
  60. Row 3 / Column 8 → 4 (Naked Single)
  61. Row 1 / Column 8 → 3 (Full House)
  62. Row 1 / Column 1 → 4 (Full House)
  63. Row 3 / Column 6 → 9 (Full House)
  64. Row 2 / Column 6 → 4 (Full House)
  65. Row 2 / Column 1 → 6 (Full House)
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