Solution for Evil Sudoku #1244713524895

1
8
3
4
2
4
7
3
7
4
4
2
5
8
7
1
4
3
7
8
1
4
1
4
5
4

This Sudoku Puzzle has 68 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Triple, Naked Single, Locked Pair, Full House techniques.

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Solution Steps:

  1. Row 3 / Column 2 → 4 (Hidden Single)
  2. Row 5 / Column 1 → 1 (Hidden Single)
  3. Locked Candidates Type 1 (Pointing): 8 in b8 => r9c79<>8
  4. Locked Candidates Type 2 (Claiming): 3 in c1 => r8c23,r9c2<>3
  5. Locked Candidates Type 2 (Claiming): 8 in c9 => r1c8<>8
  6. Naked Triple: 3,6,9 in r4c46,r5c5 => r6c46<>6, r6c46<>9
  7. Row 6 / Column 4 → 1 (Naked Single)
  8. Row 6 / Column 6 → 1 (Naked Single)
  9. Row 3 / Column 9 → 1 (Hidden Single)
  10. Row 7 / Column 8 → 1 (Hidden Single)
  11. Row 1 / Column 9 → 8 (Hidden Single)
  12. Row 1 / Column 8 → 2 (Hidden Single)
  13. Locked Candidates Type 1 (Pointing): 5 in b3 => r2c23<>5
  14. Locked Candidates Type 1 (Pointing): 6 in b3 => r2c234<>6
  15. Locked Candidates Type 1 (Pointing): 9 in b3 => r2c234<>9
  16. Row 2 / Column 2 → 3 (Naked Single)
  17. Row 2 / Column 4 → 7 (Naked Single)
  18. Row 2 / Column 3 → 7 (Naked Single)
  19. Row 8 / Column 6 → 7 (Hidden Single)
  20. Row 9 / Column 9 → 7 (Hidden Single)
  21. Row 5 / Column 8 → 7 (Hidden Single)
  22. Naked Triple: 5,6,9 in r1c56,r3c6 => r3c45<>6, r3c45<>9, r3c5<>5
  23. Row 3 / Column 4 → 8 (Naked Single)
  24. Row 3 / Column 5 → 8 (Naked Single)
  25. Naked Triple: 5,6,9 in r1c135 => r1c6<>5, r1c6<>6, r1c6<>9
  26. Row 1 / Column 6 → 9 (Naked Single)
  27. Locked Pair: 5,6 in r1c13 => r1c5,r3c13<>5, r1c5,r3c13<>6
  28. Row 1 / Column 5 → 6 (Naked Single)
  29. Row 1 / Column 1 → 5 (Naked Single)
  30. Row 1 / Column 3 → 5 (Naked Single)
  31. Row 3 / Column 6 → 5 (Naked Single)
  32. Row 9 / Column 2 → 5 (Hidden Single)
  33. Row 7 / Column 5 → 5 (Hidden Single)
  34. Row 4 / Column 8 → 5 (Hidden Single)
  35. Row 2 / Column 7 → 5 (Hidden Single)
  36. Row 4 / Column 2 → 8 (Hidden Single)
  37. Locked Candidates Type 1 (Pointing): 6 in b5 => r4c3<>6
  38. Locked Candidates Type 2 (Claiming): 6 in c1 => r8c23<>6
  39. Row 5 / Column 3 → 6 (Hidden Single)
  40. Row 5 / Column 5 → 3 (Hidden Single)
  41. Row 4 / Column 6 → 6 (Naked Single)
  42. Row 9 / Column 5 → 9 (Naked Single)
  43. Row 4 / Column 4 → 9 (Naked Single)
  44. Row 4 / Column 3 → 3 (Full House)
  45. Row 7 / Column 6 → 3 (Naked Single)
  46. Locked Pair: 2,9 in r5c79 => r5c2,r6c7<>2, r5c2,r6c78<>9
  47. Row 5 / Column 2 → 9 (Naked Single)
  48. Row 5 / Column 7 → 2 (Naked Single)
  49. Row 5 / Column 9 → 2 (Naked Single)
  50. Row 6 / Column 2 → 2 (Naked Single)
  51. Row 8 / Column 2 → 2 (Naked Single)
  52. Row 8 / Column 3 → 9 (Naked Single)
  53. Row 3 / Column 3 → 2 (Naked Single)
  54. Row 7 / Column 1 → 6 (Naked Single)
  55. Row 3 / Column 1 → 9 (Naked Single)
  56. Row 8 / Column 1 → 3 (Full House)
  57. Row 9 / Column 1 → 3 (Full House)
  58. Row 7 / Column 4 → 2 (Naked Single)
  59. Row 7 / Column 7 → 9 (Full House)
  60. Row 7 / Column 9 → 9 (Full House)
  61. Row 9 / Column 4 → 6 (Full House)
  62. Row 9 / Column 7 → 6 (Naked Single)
  63. Row 2 / Column 9 → 6 (Naked Single)
  64. Row 2 / Column 8 → 9 (Full House)
  65. Row 6 / Column 7 → 8 (Naked Single)
  66. Row 8 / Column 7 → 8 (Naked Single)
  67. Row 8 / Column 8 → 8 (Naked Single)
  68. Row 6 / Column 8 → 6 (Naked Single)
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