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

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

Try To Solve This Puzzle

Solution Steps:

  1. Row 5 / Column 1 → 7 (Hidden Single)
  2. Row 4 / Column 8 → 3 (Hidden Single)
  3. Row 5 / Column 4 → 3 (Hidden Single)
  4. Locked Triple: 1,5,6 in r456c7 => r13c7,r5c9<>1, r139c7,r5c9,r6c8<>5, r1379c7,r5c9,r6c8<>6
  5. Row 9 / Column 7 → 3 (Naked Single)
  6. Row 7 / Column 7 → 7 (Naked Single)
  7. Row 7 / Column 1 → 3 (Hidden Single)
  8. Row 1 / Column 8 → 7 (Hidden Single)
  9. Row 8 / Column 2 → 7 (Hidden Single)
  10. Row 9 / Column 1 → 4 (Hidden Single)
  11. Locked Candidates Type 1 (Pointing): 5 in b7 => r5c3<>5
  12. Locked Candidates Type 2 (Claiming): 9 in r2 => r1c4<>9
  13. X-Wing: 2 r68 c48 => r47c4<>2
  14. Row 4 / Column 1 → 2 (Hidden Single)
  15. Row 5 / Column 3 → 6 (Naked Single)
  16. Row 1 / Column 3 → 2 (Hidden Single)
  17. Locked Candidates Type 1 (Pointing): 8 in b4 => r27c2<>8
  18. Locked Candidates Type 1 (Pointing): 8 in b7 => r3c3<>8
  19. Locked Candidates Type 2 (Claiming): 8 in r2 => r1c45,r3c5<>8
  20. Naked Triple: 1,5,6 in r1c459 => r1c1<>6
  21. Empty Rectangle: 6 in b9 (r38c1) => r3c9<>6
  22. Uniqueness Test 1: 8/9 in r1c17,r3c17 => r3c1<>8, r3c1<>9
  23. Row 3 / Column 1 → 6 (Naked Single)
  24. Row 2 / Column 2 → 1 (Naked Single)
  25. Row 8 / Column 1 → 9 (Naked Single)
  26. Row 1 / Column 1 → 8 (Full House)
  27. Row 3 / Column 3 → 9 (Full House)
  28. Row 7 / Column 2 → 6 (Naked Single)
  29. Row 1 / Column 7 → 9 (Naked Single)
  30. Row 3 / Column 7 → 8 (Naked Single)
  31. Row 7 / Column 9 → 2 (Naked Single)
  32. Row 5 / Column 9 → 4 (Naked Single)
  33. Row 5 / Column 6 → 1 (Naked Single)
  34. Row 6 / Column 8 → 2 (Naked Single)
  35. Row 5 / Column 7 → 5 (Naked Single)
  36. Row 5 / Column 5 → 2 (Full House)
  37. Row 8 / Column 6 → 6 (Naked Single)
  38. Row 6 / Column 7 → 6 (Naked Single)
  39. Row 4 / Column 7 → 1 (Full House)
  40. Row 4 / Column 6 → 8 (Naked Single)
  41. Row 8 / Column 8 → 5 (Naked Single)
  42. Row 9 / Column 9 → 6 (Full House)
  43. Row 9 / Column 5 → 8 (Naked Single)
  44. Row 4 / Column 2 → 5 (Naked Single)
  45. Row 4 / Column 4 → 6 (Full House)
  46. Row 6 / Column 2 → 8 (Full House)
  47. Row 6 / Column 6 → 4 (Naked Single)
  48. Row 2 / Column 6 → 9 (Full House)
  49. Row 6 / Column 4 → 5 (Full House)
  50. Row 3 / Column 8 → 4 (Naked Single)
  51. Row 2 / Column 8 → 6 (Full House)
  52. Row 8 / Column 3 → 1 (Naked Single)
  53. Row 8 / Column 4 → 2 (Full House)
  54. Row 9 / Column 3 → 5 (Naked Single)
  55. Row 9 / Column 4 → 9 (Full House)
  56. Row 7 / Column 3 → 8 (Full House)
  57. Row 1 / Column 4 → 1 (Naked Single)
  58. Row 2 / Column 5 → 4 (Naked Single)
  59. Row 2 / Column 4 → 8 (Full House)
  60. Row 7 / Column 4 → 4 (Full House)
  61. Row 7 / Column 5 → 1 (Full House)
  62. Row 1 / Column 9 → 5 (Naked Single)
  63. Row 1 / Column 5 → 6 (Full House)
  64. Row 3 / Column 5 → 5 (Full House)
  65. Row 3 / Column 9 → 1 (Full House)
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