Solution for Evil Sudoku #1247713524895

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

This Sudoku Puzzle has 65 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Triple, Naked Single, Hidden 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 3 / Column 3 → 4 (Hidden Single)
  4. Row 8 / Column 8 → 7 (Hidden Single)
  5. Row 5 / Column 9 → 7 (Hidden Single)
  6. Row 8 / Column 7 → 8 (Hidden Single)
  7. Locked Candidates Type 1 (Pointing): 1 in b2 => r3c9<>1
  8. Locked Candidates Type 1 (Pointing): 8 in b6 => r1c8<>8
  9. Locked Candidates Type 2 (Claiming): 2 in r8 => r79c1,r9c2<>2
  10. Locked Candidates Type 2 (Claiming): 3 in c1 => r8c23,r9c2<>3
  11. Naked Triple: 3,6,9 in r4c46,r5c5 => r6c46<>6, r6c46<>9
  12. Row 6 / Column 4 → 1 (Naked Single)
  13. Row 6 / Column 6 → 1 (Naked Single)
  14. Hidden Pair: 1,3 in r4c6,r5c5 => r4c6,r5c5<>6, r4c6,r5c5<>9
  15. Row 4 / Column 6 → 3 (Naked Single)
  16. Row 5 / Column 5 → 3 (Naked Single)
  17. Row 4 / Column 4 → 6 (Hidden Single)
  18. Row 8 / Column 1 → 3 (Hidden Single)
  19. Row 2 / Column 2 → 3 (Hidden Single)
  20. Row 7 / Column 7 → 3 (Hidden Single)
  21. Locked Candidates Type 2 (Claiming): 2 in c1 => r1c3,r3c2<>2
  22. Naked Triple: 5,6,9 in r12c3,r3c2 => r13c1<>5, r13c1<>6, r13c1<>9
  23. Row 1 / Column 1 → 2 (Naked Single)
  24. Row 3 / Column 1 → 2 (Naked Single)
  25. Locked Candidates Type 2 (Claiming): 5 in c1 => r9c2<>5
  26. Locked Candidates Type 2 (Claiming): 6 in c1 => r8c23,r9c2<>6
  27. Row 9 / Column 2 → 9 (Naked Single)
  28. Row 8 / Column 2 → 2 (Naked Single)
  29. Row 8 / Column 3 → 2 (Naked Single)
  30. Row 5 / Column 2 → 6 (Naked Single)
  31. Row 3 / Column 2 → 5 (Naked Single)
  32. Row 4 / Column 2 → 8 (Full House)
  33. Row 6 / Column 2 → 8 (Full House)
  34. Row 5 / Column 3 → 9 (Naked Single)
  35. Row 1 / Column 3 → 6 (Naked Single)
  36. Row 2 / Column 3 → 6 (Naked Single)
  37. Row 4 / Column 3 → 5 (Naked Single)
  38. Row 4 / Column 8 → 9 (Full House)
  39. Row 5 / Column 7 → 2 (Naked Single)
  40. Row 5 / Column 8 → 2 (Naked Single)
  41. Row 1 / Column 8 → 5 (Naked Single)
  42. Row 9 / Column 7 → 6 (Naked Single)
  43. Row 1 / Column 6 → 9 (Naked Single)
  44. Row 1 / Column 5 → 8 (Full House)
  45. Row 1 / Column 9 → 8 (Full House)
  46. Row 2 / Column 7 → 9 (Naked Single)
  47. Row 6 / Column 7 → 5 (Full House)
  48. Row 2 / Column 8 → 1 (Naked Single)
  49. Row 6 / Column 8 → 6 (Naked Single)
  50. Row 7 / Column 8 → 1 (Naked Single)
  51. Row 9 / Column 1 → 5 (Naked Single)
  52. Row 9 / Column 9 → 2 (Naked Single)
  53. Row 3 / Column 4 → 8 (Naked Single)
  54. Row 3 / Column 6 → 6 (Naked Single)
  55. Row 8 / Column 6 → 6 (Naked Single)
  56. Row 3 / Column 5 → 6 (Naked Single)
  57. Row 9 / Column 5 → 5 (Naked Single)
  58. Row 2 / Column 9 → 1 (Naked Single)
  59. Row 3 / Column 9 → 6 (Naked Single)
  60. Row 7 / Column 1 → 6 (Naked Single)
  61. Row 7 / Column 9 → 9 (Naked Single)
  62. Row 9 / Column 4 → 8 (Naked Single)
  63. Row 7 / Column 6 → 5 (Naked Single)
  64. Row 7 / Column 5 → 9 (Naked Single)
  65. Row 7 / Column 4 → 2 (Naked Single)
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