Solution for Hard Sudoku #1213592476898

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

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