Solution for Hard Sudoku #1231475298698

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

Naked Single Explanation
Hidden Single Explanation
Locked Candidates Explanation
Locked Candidates Explanation
Full House Explanation
Try To Solve This Puzzle

Solution Steps:

  1. Row 1 / Column 4 → 7 (Naked Single)
  2. Row 2 / Column 4 → 3 (Naked Single)
  3. Row 3 / Column 4 → 4 (Naked Single)
  4. Row 6 / Column 4 → 5 (Naked Single)
  5. Row 7 / Column 4 → 8 (Full House)
  6. Row 4 / Column 5 → 8 (Hidden Single)
  7. Row 5 / Column 5 → 3 (Hidden Single)
  8. Row 6 / Column 3 → 3 (Hidden Single)
  9. Row 8 / Column 2 → 6 (Hidden Single)
  10. Row 3 / Column 9 → 3 (Hidden Single)
  11. Row 7 / Column 6 → 3 (Hidden Single)
  12. Row 3 / Column 7 → 5 (Hidden Single)
  13. Row 8 / Column 9 → 8 (Hidden Single)
  14. Row 9 / Column 1 → 8 (Hidden Single)
  15. Row 1 / Column 7 → 8 (Hidden Single)
  16. Row 3 / Column 2 → 8 (Hidden Single)
  17. Locked Candidates Type 1 (Pointing): 2 in b1 => r78c1<>2
  18. Locked Candidates Type 1 (Pointing): 6 in b6 => r2c9<>6
  19. Locked Candidates Type 1 (Pointing): 7 in b7 => r7c5<>7
  20. Locked Candidates Type 2 (Claiming): 1 in c3 => r7c12,r8c1<>1
  21. 2-String Kite: 9 in r3c6,r6c1 (connected by r4c6,r6c5) => r3c1<>9
  22. Turbot Fish: 9 r1c2 =9= r2c1 -9- r6c1 =9= r6c5 => r1c5<>9
  23. XY-Wing: 1/9/2 in r1c29,r3c1 => r3c8<>2
  24. XY-Wing: 2/7/9 in r49c6,r9c3 => r4c3<>9
  25. Row 4 / Column 3 → 4 (Naked Single)
  26. Row 5 / Column 9 → 4 (Hidden Single)
  27. Row 5 / Column 8 → 5 (Hidden Single)
  28. Row 7 / Column 9 → 5 (Hidden Single)
  29. Row 9 / Column 5 → 5 (Hidden Single)
  30. Row 6 / Column 7 → 1 (Hidden Single)
  31. Row 8 / Column 1 → 5 (Hidden Single)
  32. Row 9 / Column 6 → 7 (Hidden Single)
  33. Row 4 / Column 6 → 9 (Naked Single)
  34. Row 6 / Column 5 → 7 (Full House)
  35. Row 6 / Column 9 → 6 (Naked Single)
  36. Row 6 / Column 1 → 9 (Full House)
  37. Row 8 / Column 5 → 4 (Hidden Single)
  38. Row 7 / Column 1 → 4 (Hidden Single)
  39. Row 4 / Column 1 → 6 (Hidden Single)
  40. Row 1 / Column 2 → 9 (Hidden Single)
  41. Row 1 / Column 9 → 2 (Naked Single)
  42. Row 1 / Column 5 → 1 (Full House)
  43. Row 7 / Column 2 → 7 (Naked Single)
  44. Row 5 / Column 2 → 1 (Full House)
  45. Row 5 / Column 1 → 7 (Full House)
  46. Row 2 / Column 7 → 7 (Naked Single)
  47. Row 4 / Column 7 → 2 (Full House)
  48. Row 4 / Column 9 → 7 (Full House)
  49. Row 2 / Column 9 → 9 (Full House)
  50. Row 3 / Column 6 → 2 (Naked Single)
  51. Row 8 / Column 6 → 1 (Full House)
  52. Row 7 / Column 5 → 2 (Full House)
  53. Row 8 / Column 3 → 2 (Full House)
  54. Row 2 / Column 5 → 6 (Naked Single)
  55. Row 3 / Column 5 → 9 (Full House)
  56. Row 3 / Column 1 → 1 (Naked Single)
  57. Row 2 / Column 1 → 2 (Full House)
  58. Row 2 / Column 8 → 1 (Full House)
  59. Row 3 / Column 8 → 6 (Full House)
  60. Row 7 / Column 8 → 9 (Naked Single)
  61. Row 7 / Column 3 → 1 (Full House)
  62. Row 9 / Column 3 → 9 (Full House)
  63. Row 9 / Column 8 → 2 (Full House)
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