Solution for Evil Sudoku #1357713524895

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

This Sudoku Puzzle has 67 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Single, Locked Triple, Naked Pair, Full House techniques.

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Solution Steps:

  1. Row 1 / Column 5 → 1 (Hidden Single)
  2. Row 4 / Column 8 → 7 (Hidden Single)
  3. Row 1 / Column 3 → 4 (Hidden Single)
  4. Row 2 / Column 1 → 5 (Hidden Single)
  5. Row 9 / Column 5 → 7 (Hidden Single)
  6. Row 8 / Column 2 → 7 (Hidden Single)
  7. Row 3 / Column 8 → 5 (Hidden Single)
  8. Row 7 / Column 2 → 8 (Hidden Single)
  9. Row 2 / Column 8 → 3 (Hidden Single)
  10. Locked Candidates Type 1 (Pointing): 3 in b2 => r3c2<>3
  11. Locked Candidates Type 1 (Pointing): 1 in b6 => r9c7<>1
  12. Locked Candidates Type 1 (Pointing): 8 in b8 => r8c9<>8
  13. Locked Candidates Type 2 (Claiming): 2 in c2 => r1c1<>2
  14. Locked Candidates Type 2 (Claiming): 6 in c8 => r89c9,r9c7<>6
  15. Locked Candidates Type 2 (Claiming): 9 in c8 => r89c9,r9c7<>9
  16. Row 8 / Column 9 → 2 (Naked Single)
  17. Locked Triple: 6,8,9 in r8c456 => r7c45,r8c38<>6, r7c45,r8c38<>9
  18. Row 8 / Column 3 → 1 (Naked Single)
  19. Row 8 / Column 8 → 1 (Naked Single)
  20. Locked Candidates Type 1 (Pointing): 2 in b8 => r7c13<>2
  21. Naked Pair: 6,9 in r16c9 => r35c9<>6, r35c9<>9
  22. Row 3 / Column 9 → 4 (Naked Single)
  23. Row 5 / Column 9 → 8 (Naked Single)
  24. Row 9 / Column 9 → 8 (Naked Single)
  25. Row 9 / Column 7 → 4 (Naked Single)
  26. Row 4 / Column 1 → 8 (Hidden Single)
  27. Row 4 / Column 3 → 2 (Hidden Single)
  28. Row 9 / Column 1 → 2 (Hidden Single)
  29. Locked Triple: 2,6,9 in r123c7 => r1c9,r456c7<>6, r1c9,r456c7<>9
  30. Row 4 / Column 7 → 1 (Naked Single)
  31. Row 5 / Column 7 → 5 (Naked Single)
  32. Row 1 / Column 9 → 9 (Naked Single)
  33. Row 6 / Column 7 → 5 (Naked Single)
  34. Row 6 / Column 9 → 6 (Naked Single)
  35. Row 6 / Column 4 → 1 (Hidden Single)
  36. Row 6 / Column 6 → 4 (Hidden Single)
  37. Row 3 / Column 6 → 3 (Hidden Single)
  38. Row 5 / Column 5 → 3 (Hidden Single)
  39. Locked Candidates Type 1 (Pointing): 9 in b1 => r6c2<>9
  40. Row 6 / Column 2 → 3 (Naked Single)
  41. Row 6 / Column 3 → 9 (Naked Single)
  42. Row 5 / Column 1 → 6 (Full House)
  43. Row 5 / Column 3 → 6 (Full House)
  44. Row 9 / Column 3 → 6 (Naked Single)
  45. Row 1 / Column 1 → 3 (Naked Single)
  46. Row 7 / Column 1 → 9 (Full House)
  47. Row 7 / Column 3 → 3 (Naked Single)
  48. Row 9 / Column 8 → 9 (Naked Single)
  49. Row 7 / Column 8 → 6 (Naked Single)
  50. Locked Candidates Type 2 (Claiming): 6 in c3 => r123c2<>6
  51. Row 1 / Column 2 → 2 (Naked Single)
  52. Row 2 / Column 2 → 9 (Full House)
  53. Row 3 / Column 2 → 9 (Full House)
  54. Row 1 / Column 7 → 6 (Naked Single)
  55. Row 2 / Column 7 → 2 (Naked Single)
  56. Row 3 / Column 7 → 2 (Naked Single)
  57. Row 3 / Column 5 → 6 (Naked Single)
  58. Row 2 / Column 5 → 4 (Naked Single)
  59. Row 2 / Column 6 → 8 (Full House)
  60. Row 2 / Column 4 → 8 (Full House)
  61. Row 8 / Column 5 → 9 (Naked Single)
  62. Row 7 / Column 5 → 2 (Full House)
  63. Row 7 / Column 4 → 4 (Full House)
  64. Row 8 / Column 4 → 6 (Full House)
  65. Row 8 / Column 6 → 6 (Full House)
  66. Row 4 / Column 4 → 9 (Full House)
  67. Row 4 / Column 6 → 9 (Full House)
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