Solution for Evil Sudoku #1172713524895

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

This Sudoku Puzzle has 66 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 6 / Column 2 → 7 (Hidden Single)
  2. Row 9 / Column 5 → 1 (Hidden Single)
  3. Row 2 / Column 8 → 7 (Hidden Single)
  4. Row 9 / Column 7 → 4 (Hidden Single)
  5. Row 3 / Column 8 → 8 (Hidden Single)
  6. Locked Candidates Type 1 (Pointing): 4 in b1 => r1c5<>4
  7. Locked Candidates Type 1 (Pointing): 8 in b2 => r2c1<>8
  8. Locked Candidates Type 1 (Pointing): 1 in b4 => r1c3<>1
  9. Locked Candidates Type 1 (Pointing): 5 in b9 => r5c9<>5
  10. Locked Candidates Type 2 (Claiming): 3 in r9 => r78c8,r8c9<>3
  11. Naked Pair: 6,9 in r6c47 => r6c369<>6, r6c369<>9
  12. Row 6 / Column 6 → 1 (Naked Single)
  13. Row 6 / Column 9 → 8 (Naked Single)
  14. Row 6 / Column 3 → 8 (Naked Single)
  15. Row 4 / Column 3 → 1 (Hidden Single)
  16. Row 1 / Column 1 → 8 (Hidden Single)
  17. Row 1 / Column 3 → 4 (Hidden Single)
  18. Row 7 / Column 1 → 4 (Hidden Single)
  19. Row 2 / Column 1 → 2 (Hidden Single)
  20. Locked Candidates Type 1 (Pointing): 5 in b1 => r78c2<>5
  21. Locked Candidates Type 1 (Pointing): 6 in b1 => r78c2<>6
  22. Locked Pair: 3,9 in r78c2 => r123c2,r789c3,r9c1<>9
  23. Row 5 / Column 3 → 9 (Hidden Single)
  24. Locked Candidates Type 1 (Pointing): 5 in b4 => r9c1<>5
  25. Row 9 / Column 1 → 6 (Naked Single)
  26. Row 4 / Column 1 → 5 (Full House)
  27. Row 5 / Column 1 → 5 (Full House)
  28. Row 7 / Column 3 → 5 (Naked Single)
  29. Row 8 / Column 3 → 2 (Naked Single)
  30. Row 9 / Column 3 → 2 (Naked Single)
  31. Row 9 / Column 9 → 5 (Hidden Single)
  32. Row 9 / Column 8 → 3 (Hidden Single)
  33. Locked Pair: 3,6 in r5c79 => r4c7,r5c5<>3, r4c78,r5c5,r6c7<>6
  34. Row 5 / Column 5 → 6 (Naked Single)
  35. Row 4 / Column 7 → 9 (Naked Single)
  36. Row 4 / Column 8 → 9 (Naked Single)
  37. Row 6 / Column 7 → 9 (Naked Single)
  38. Row 2 / Column 5 → 9 (Naked Single)
  39. Row 5 / Column 7 → 3 (Naked Single)
  40. Row 5 / Column 9 → 3 (Naked Single)
  41. Row 6 / Column 4 → 9 (Naked Single)
  42. Row 4 / Column 6 → 4 (Naked Single)
  43. Row 7 / Column 8 → 6 (Naked Single)
  44. Row 8 / Column 8 → 6 (Naked Single)
  45. Row 1 / Column 5 → 2 (Naked Single)
  46. Row 7 / Column 5 → 3 (Naked Single)
  47. Row 4 / Column 4 → 3 (Naked Single)
  48. Row 7 / Column 4 → 3 (Naked Single)
  49. Row 8 / Column 9 → 9 (Naked Single)
  50. Row 3 / Column 5 → 4 (Naked Single)
  51. Row 7 / Column 2 → 9 (Naked Single)
  52. Row 8 / Column 5 → 4 (Naked Single)
  53. Row 1 / Column 9 → 6 (Naked Single)
  54. Row 1 / Column 2 → 1 (Full House)
  55. Row 1 / Column 7 → 1 (Full House)
  56. Row 3 / Column 9 → 6 (Naked Single)
  57. Row 8 / Column 2 → 3 (Naked Single)
  58. Row 2 / Column 7 → 1 (Naked Single)
  59. Row 3 / Column 7 → 2 (Naked Single)
  60. Row 3 / Column 2 → 5 (Naked Single)
  61. Row 2 / Column 2 → 6 (Full House)
  62. Row 3 / Column 6 → 5 (Naked Single)
  63. Row 2 / Column 4 → 8 (Naked Single)
  64. Row 2 / Column 6 → 8 (Naked Single)
  65. Row 8 / Column 6 → 8 (Naked Single)
  66. Row 8 / Column 4 → 5 (Naked Single)
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