Solution for Evil Sudoku #1272713524895

1
8
3
4
2
7
7
3
7
7
2
2
5
8
7
1
7
3
7
8
1
4
1
2
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 Pair, Naked Single, Locked Pair, Full House techniques.

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Solution Steps:

  1. Row 2 / Column 4 → 7 (Hidden Single)
  2. Row 5 / Column 1 → 1 (Hidden Single)
  3. Row 8 / Column 6 → 7 (Hidden Single)
  4. Row 7 / Column 1 → 4 (Hidden Single)
  5. Locked Candidates Type 1 (Pointing): 1 in b2 => r3c9<>1
  6. Locked Candidates Type 1 (Pointing): 4 in b3 => r5c9<>4
  7. Locked Candidates Type 1 (Pointing): 2 in b7 => r8c78<>2
  8. Locked Candidates Type 1 (Pointing): 5 in b7 => r9c5<>5
  9. Locked Candidates Type 1 (Pointing): 8 in b8 => r9c79<>8
  10. Locked Candidates Type 2 (Claiming): 3 in c1 => r8c23,r9c2<>3
  11. Locked Candidates Type 2 (Claiming): 8 in c9 => r1c8<>8
  12. Naked Pair: 6,9 in r47c4 => r369c4<>6, r369c4<>9
  13. Row 6 / Column 4 → 1 (Naked Single)
  14. Row 9 / Column 4 → 8 (Naked Single)
  15. Row 3 / Column 4 → 8 (Naked Single)
  16. Row 3 / Column 6 → 1 (Hidden Single)
  17. Row 1 / Column 9 → 8 (Hidden Single)
  18. Row 1 / Column 3 → 4 (Hidden Single)
  19. Row 3 / Column 9 → 4 (Hidden Single)
  20. Row 1 / Column 8 → 2 (Hidden Single)
  21. Locked Candidates Type 1 (Pointing): 5 in b3 => r2c23<>5
  22. Locked Candidates Type 1 (Pointing): 6 in b3 => r2c23<>6
  23. Locked Pair: 3,9 in r2c23 => r13c1,r2c789,r3c23<>9
  24. Row 3 / Column 5 → 9 (Hidden Single)
  25. Locked Candidates Type 1 (Pointing): 5 in b2 => r1c1<>5
  26. Row 1 / Column 1 → 6 (Naked Single)
  27. Row 1 / Column 5 → 5 (Full House)
  28. Row 1 / Column 6 → 5 (Full House)
  29. Row 3 / Column 3 → 5 (Naked Single)
  30. Row 3 / Column 1 → 2 (Naked Single)
  31. Row 3 / Column 2 → 2 (Naked Single)
  32. Row 9 / Column 1 → 5 (Hidden Single)
  33. Row 8 / Column 1 → 3 (Hidden Single)
  34. Locked Pair: 6,9 in r8c23 => r8c78,r9c2<>6, r8c78,r9c2<>9
  35. Row 8 / Column 7 → 8 (Naked Single)
  36. Row 8 / Column 8 → 8 (Naked Single)
  37. Row 9 / Column 2 → 9 (Naked Single)
  38. Row 2 / Column 2 → 3 (Naked Single)
  39. Row 8 / Column 2 → 6 (Naked Single)
  40. Row 8 / Column 3 → 6 (Naked Single)
  41. Row 9 / Column 9 → 6 (Naked Single)
  42. Row 2 / Column 3 → 9 (Naked Single)
  43. Row 5 / Column 2 → 4 (Naked Single)
  44. Row 2 / Column 9 → 1 (Naked Single)
  45. Row 9 / Column 5 → 3 (Naked Single)
  46. Row 5 / Column 5 → 6 (Full House)
  47. Row 7 / Column 5 → 6 (Full House)
  48. Row 9 / Column 7 → 3 (Naked Single)
  49. Row 4 / Column 3 → 3 (Naked Single)
  50. Row 5 / Column 3 → 3 (Naked Single)
  51. Row 4 / Column 4 → 9 (Naked Single)
  52. Row 4 / Column 6 → 4 (Full House)
  53. Row 6 / Column 6 → 4 (Full House)
  54. Row 5 / Column 8 → 9 (Naked Single)
  55. Row 7 / Column 4 → 9 (Naked Single)
  56. Row 5 / Column 9 → 2 (Full House)
  57. Row 7 / Column 9 → 2 (Full House)
  58. Row 7 / Column 6 → 9 (Naked Single)
  59. Row 5 / Column 7 → 2 (Naked Single)
  60. Row 7 / Column 8 → 1 (Naked Single)
  61. Row 7 / Column 7 → 2 (Naked Single)
  62. Row 4 / Column 2 → 8 (Hidden Single)
  63. Row 6 / Column 2 → 5 (Naked Single)
  64. Row 6 / Column 7 → 6 (Naked Single)
  65. Row 4 / Column 8 → 5 (Full House)
  66. Row 6 / Column 8 → 6 (Naked Single)
  67. Row 2 / Column 7 → 5 (Naked Single)
  68. Row 2 / Column 8 → 6 (Full House)
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