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.

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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