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

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.

Naked Single Explanation
Hidden Single Explanation
Hidden Pair Explanation
Locked Candidates Explanation
Full House Explanation
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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