Solution for Hard Sudoku #2118295473698

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

This Sudoku Puzzle has 63 steps and it is solved using Naked Single, Full House, Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), undefined, Turbot Fish techniques.

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Solution Steps:

  1. Row 6 / Column 9 → 9 (Naked Single)
  2. Row 6 / Column 8 → 1 (Naked Single)
  3. Row 6 / Column 4 → 5 (Naked Single)
  4. Row 6 / Column 7 → 2 (Naked Single)
  5. Row 6 / Column 3 → 3 (Full House)
  6. Row 5 / Column 6 → 3 (Hidden Single)
  7. Row 7 / Column 4 → 1 (Hidden Single)
  8. Row 8 / Column 2 → 6 (Hidden Single)
  9. Row 5 / Column 5 → 1 (Hidden Single)
  10. Row 1 / Column 7 → 1 (Hidden Single)
  11. Row 4 / Column 3 → 1 (Hidden Single)
  12. Row 3 / Column 7 → 5 (Hidden Single)
  13. Row 1 / Column 2 → 3 (Hidden Single)
  14. Row 9 / Column 1 → 3 (Hidden Single)
  15. Row 3 / Column 9 → 3 (Hidden Single)
  16. Row 8 / Column 7 → 3 (Hidden Single)
  17. Locked Candidates Type 1 (Pointing): 6 in b2 => r1c8<>6
  18. Locked Candidates Type 1 (Pointing): 9 in b7 => r5c3<>9
  19. Locked Candidates Type 1 (Pointing): 4 in b9 => r9c23<>4
  20. Locked Candidates Type 2 (Claiming): 8 in r7 => r89c3,r9c2<>8
  21. 2-String Kite: 7 in r4c7,r9c4 (connected by r4c6,r5c4) => r9c7<>7
  22. Turbot Fish: 7 r5c4 =7= r9c4 -7- r9c8 =7= r8c9 => r5c9<>7
  23. XY-Wing: 7/8/4 in r18c9,r9c7 => r2c7<>4
  24. XY-Wing: 4/9/7 in r4c16,r7c1 => r7c6<>7
  25. Row 7 / Column 6 → 2 (Naked Single)
  26. Row 1 / Column 5 → 2 (Hidden Single)
  27. Row 1 / Column 3 → 5 (Hidden Single)
  28. Row 2 / Column 5 → 5 (Hidden Single)
  29. Row 5 / Column 1 → 5 (Hidden Single)
  30. Row 9 / Column 2 → 5 (Hidden Single)
  31. Row 3 / Column 4 → 8 (Hidden Single)
  32. Row 5 / Column 4 → 9 (Hidden Single)
  33. Row 4 / Column 6 → 7 (Full House)
  34. Row 1 / Column 4 → 6 (Naked Single)
  35. Row 9 / Column 4 → 7 (Full House)
  36. Row 4 / Column 1 → 9 (Hidden Single)
  37. Row 9 / Column 3 → 2 (Hidden Single)
  38. Row 5 / Column 2 → 2 (Hidden Single)
  39. Row 9 / Column 6 → 6 (Hidden Single)
  40. Row 8 / Column 9 → 7 (Hidden Single)
  41. Row 1 / Column 9 → 4 (Naked Single)
  42. Row 5 / Column 9 → 8 (Full House)
  43. Row 8 / Column 3 → 9 (Naked Single)
  44. Row 8 / Column 5 → 8 (Full House)
  45. Row 9 / Column 5 → 9 (Full House)
  46. Row 1 / Column 6 → 9 (Naked Single)
  47. Row 1 / Column 8 → 7 (Full House)
  48. Row 3 / Column 6 → 4 (Full House)
  49. Row 3 / Column 8 → 9 (Full House)
  50. Row 4 / Column 7 → 4 (Naked Single)
  51. Row 4 / Column 2 → 8 (Full House)
  52. Row 5 / Column 3 → 4 (Full House)
  53. Row 7 / Column 2 → 4 (Full House)
  54. Row 5 / Column 8 → 6 (Naked Single)
  55. Row 5 / Column 7 → 7 (Full House)
  56. Row 9 / Column 7 → 8 (Naked Single)
  57. Row 2 / Column 7 → 6 (Full House)
  58. Row 2 / Column 8 → 8 (Full House)
  59. Row 9 / Column 8 → 4 (Full House)
  60. Row 2 / Column 3 → 7 (Naked Single)
  61. Row 2 / Column 1 → 4 (Full House)
  62. Row 7 / Column 1 → 7 (Full House)
  63. Row 7 / Column 3 → 8 (Full House)
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