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

This Sudoku Puzzle has 74 steps and it is solved using Hidden Single, Naked Single, Full House, Locked Candidates Type 1 (Pointing), Hidden Pair, Naked Pair, Turbot Fish, Uniqueness Test 1, Empty Rectangle, Hidden Rectangle, undefined, Skyscraper techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 2 / Column 7 → 8 (Hidden Single)
  2. Row 4 / Column 4 → 8 (Hidden Single)
  3. Row 6 / Column 1 → 8 (Hidden Single)
  4. Row 1 / Column 7 → 9 (Hidden Single)
  5. Row 3 / Column 4 → 9 (Hidden Single)
  6. Row 8 / Column 9 → 8 (Hidden Single)
  7. Row 8 / Column 8 → 9 (Hidden Single)
  8. Row 8 / Column 2 → 1 (Hidden Single)
  9. Row 6 / Column 2 → 3 (Naked Single)
  10. Row 4 / Column 2 → 5 (Naked Single)
  11. Row 5 / Column 2 → 9 (Naked Single)
  12. Row 5 / Column 1 → 4 (Naked Single)
  13. Row 5 / Column 3 → 1 (Full House)
  14. Row 6 / Column 4 → 1 (Hidden Single)
  15. Row 7 / Column 1 → 9 (Hidden Single)
  16. Locked Candidates Type 1 (Pointing): 4 in b5 => r128c6<>4
  17. Locked Candidates Type 1 (Pointing): 2 in b7 => r13c1<>2
  18. Row 1 / Column 1 → 5 (Naked Single)
  19. Hidden Pair: 1,5 in r9c89 => r9c8<>3, r9c89<>6, r9c9<>7
  20. Row 4 / Column 8 → 3 (Hidden Single)
  21. Row 5 / Column 6 → 3 (Hidden Single)
  22. Row 5 / Column 5 → 5 (Hidden Single)
  23. Row 2 / Column 6 → 5 (Hidden Single)
  24. Naked Pair: 4,6 in r26c8 => r3c8<>4, r3c8<>6
  25. Turbot Fish: 6 r2c8 =6= r6c8 -6- r6c6 =6= r5c4 => r2c4<>6
  26. Uniqueness Test 1: 1/5 in r3c89,r9c89 => r3c9<>1, r3c9<>5
  27. Row 3 / Column 8 → 5 (Hidden Single)
  28. Row 9 / Column 8 → 1 (Naked Single)
  29. Row 9 / Column 9 → 5 (Naked Single)
  30. Row 3 / Column 5 → 1 (Hidden Single)
  31. Row 1 / Column 9 → 1 (Hidden Single)
  32. Row 1 / Column 6 → 2 (Hidden Single)
  33. Row 2 / Column 2 → 2 (Hidden Single)
  34. Locked Candidates Type 1 (Pointing): 6 in b2 => r79c5<>6
  35. Empty Rectangle: 6 in b9 (r37c2) => r3c7<>6
  36. Hidden Rectangle: 2/7 in r8c14,r9c14 => r9c4<>7
  37. XY-Wing: 6/7/2 in r8c16,r9c4 => r8c4,r9c1<>2
  38. Row 8 / Column 1 → 2 (Hidden Single)
  39. Row 9 / Column 4 → 2 (Hidden Single)
  40. Locked Candidates Type 1 (Pointing): 6 in b8 => r8c7<>6
  41. W-Wing: 4/7 in r4c9,r8c7 connected by 7 in r48c6 => r7c9<>4
  42. Locked Candidates Type 1 (Pointing): 4 in b9 => r3c7<>4
  43. Row 3 / Column 7 → 2 (Naked Single)
  44. Row 5 / Column 9 → 2 (Hidden Single)
  45. Naked Pair: 6,7 in r7c29 => r7c37<>6, r7c57<>7
  46. X-Wing: 6 c29 r37 => r3c3<>6
  47. Skyscraper: 7 in r7c9,r8c6 (connected by r4c69) => r8c7<>7
  48. Row 8 / Column 7 → 4 (Naked Single)
  49. Row 7 / Column 7 → 3 (Naked Single)
  50. Row 7 / Column 3 → 8 (Naked Single)
  51. Row 7 / Column 5 → 4 (Naked Single)
  52. Row 1 / Column 5 → 6 (Naked Single)
  53. Row 1 / Column 3 → 4 (Full House)
  54. Row 2 / Column 5 → 7 (Naked Single)
  55. Row 2 / Column 4 → 4 (Full House)
  56. Row 9 / Column 5 → 8 (Full House)
  57. Row 2 / Column 8 → 6 (Full House)
  58. Row 3 / Column 9 → 4 (Full House)
  59. Row 6 / Column 8 → 4 (Full House)
  60. Row 6 / Column 6 → 6 (Full House)
  61. Row 3 / Column 3 → 3 (Naked Single)
  62. Row 9 / Column 3 → 6 (Full House)
  63. Row 4 / Column 9 → 7 (Naked Single)
  64. Row 4 / Column 6 → 4 (Full House)
  65. Row 5 / Column 4 → 7 (Full House)
  66. Row 8 / Column 6 → 7 (Full House)
  67. Row 5 / Column 7 → 6 (Full House)
  68. Row 9 / Column 7 → 7 (Full House)
  69. Row 7 / Column 9 → 6 (Full House)
  70. Row 7 / Column 2 → 7 (Full House)
  71. Row 8 / Column 4 → 6 (Full House)
  72. Row 9 / Column 1 → 3 (Full House)
  73. Row 3 / Column 1 → 7 (Full House)
  74. Row 3 / Column 2 → 6 (Full House)
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