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

This Sudoku Puzzle has 72 steps and it is solved using Brute Force, Hidden Single, Naked Single, Locked Candidates Type 1 (Pointing), Hidden Pair, Hidden Triple, Empty Rectangle, Locked Candidates Type 2 (Claiming), Naked Pair, AIC, Full House 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. Row 5 / Column 3 → 9 (Brute Force)
  2. Row 2 / Column 1 → 9 (Hidden Single)
  3. Row 5 / Column 4 → 8 (Brute Force)
  4. Row 5 / Column 8 → 2 (Naked Single)
  5. Row 6 / Column 2 → 8 (Hidden Single)
  6. Locked Candidates Type 1 (Pointing): 3 in b5 => r4c1<>3
  7. Hidden Pair: 1,8 in r9c56 => r9c56<>2, r9c56<>3, r9c56<>6, r9c5<>7
  8. Locked Candidates Type 1 (Pointing): 6 in b8 => r8c12<>6
  9. Hidden Triple: 1,5,8 in r129c5 => r12c5<>2, r1c5<>3, r12c5<>7
  10. Row 1 / Column 4 → 7 (Hidden Single)
  11. Locked Candidates Type 1 (Pointing): 2 in b2 => r678c6<>2
  12. Empty Rectangle: 6 in b3 (r15c2) => r5c9<>6
  13. Row 5 / Column 9 → 1 (Naked Single)
  14. Row 4 / Column 1 → 1 (Hidden Single)
  15. Row 3 / Column 6 → 1 (Hidden Single)
  16. Row 1 / Column 5 → 5 (Naked Single)
  17. Row 9 / Column 6 → 8 (Naked Single)
  18. Row 2 / Column 5 → 8 (Naked Single)
  19. Row 9 / Column 5 → 1 (Naked Single)
  20. Row 3 / Column 8 → 8 (Hidden Single)
  21. Row 4 / Column 7 → 8 (Hidden Single)
  22. Locked Candidates Type 1 (Pointing): 5 in b1 => r3c9<>5
  23. Locked Candidates Type 2 (Claiming): 6 in r5 => r46c3,r6c1<>6
  24. Naked Pair: 4,9 in r14c8 => r2c8<>4
  25. AIC: 3/6 6- r1c7 =6= r6c7 -6- r4c9 =6= r4c5 =3= r4c4 -3- r3c4 =3= r3c9 -3 => r1c7<>3, r3c9<>6
  26. Locked Candidates Type 1 (Pointing): 3 in b3 => r89c9<>3
  27. Locked Candidates Type 1 (Pointing): 6 in b3 => r1c23<>6
  28. Row 5 / Column 2 → 6 (Hidden Single)
  29. Row 5 / Column 1 → 3 (Full House)
  30. Row 9 / Column 4 → 3 (Hidden Single)
  31. Row 3 / Column 4 → 4 (Naked Single)
  32. Row 2 / Column 6 → 2 (Naked Single)
  33. Row 1 / Column 6 → 3 (Full House)
  34. Row 3 / Column 9 → 3 (Naked Single)
  35. Row 4 / Column 5 → 3 (Hidden Single)
  36. Row 4 / Column 9 → 6 (Hidden Single)
  37. Row 1 / Column 7 → 6 (Hidden Single)
  38. Row 1 / Column 2 → 1 (Hidden Single)
  39. Row 2 / Column 2 → 4 (Naked Single)
  40. Row 1 / Column 3 → 2 (Naked Single)
  41. Row 4 / Column 3 → 4 (Naked Single)
  42. Row 4 / Column 8 → 9 (Naked Single)
  43. Row 4 / Column 4 → 2 (Full House)
  44. Row 7 / Column 4 → 9 (Full House)
  45. Row 6 / Column 3 → 7 (Naked Single)
  46. Row 6 / Column 1 → 2 (Full House)
  47. Row 1 / Column 8 → 4 (Naked Single)
  48. Row 1 / Column 9 → 9 (Full House)
  49. Row 6 / Column 7 → 5 (Naked Single)
  50. Row 6 / Column 9 → 4 (Full House)
  51. Row 6 / Column 5 → 6 (Naked Single)
  52. Row 6 / Column 6 → 9 (Full House)
  53. Row 7 / Column 6 → 4 (Naked Single)
  54. Row 8 / Column 6 → 6 (Full House)
  55. Row 2 / Column 7 → 1 (Naked Single)
  56. Row 7 / Column 7 → 3 (Naked Single)
  57. Row 8 / Column 7 → 9 (Full House)
  58. Row 7 / Column 2 → 2 (Naked Single)
  59. Row 8 / Column 2 → 3 (Full House)
  60. Row 7 / Column 5 → 7 (Naked Single)
  61. Row 7 / Column 1 → 5 (Full House)
  62. Row 8 / Column 5 → 2 (Full House)
  63. Row 3 / Column 1 → 6 (Naked Single)
  64. Row 3 / Column 3 → 5 (Full House)
  65. Row 9 / Column 3 → 6 (Full House)
  66. Row 8 / Column 9 → 7 (Naked Single)
  67. Row 8 / Column 1 → 4 (Full House)
  68. Row 9 / Column 1 → 7 (Full House)
  69. Row 2 / Column 9 → 5 (Naked Single)
  70. Row 2 / Column 8 → 7 (Full House)
  71. Row 9 / Column 8 → 5 (Full House)
  72. Row 9 / Column 9 → 2 (Full House)
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