Solution for Evil Sudoku #3426451978392

7
4
3
1
8
4
8
5
9
8
9
2
5
4
7
8
6
2
5
9
6
7
3
8

This Sudoku Puzzle has 70 steps and it is solved using Hidden Single, Locked Pair, Naked Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Full House, Naked Pair techniques.

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Solution Steps:

  1. Row 1 / Column 2 → 8 (Hidden Single)
  2. Row 6 / Column 1 → 2 (Hidden Single)
  3. Row 8 / Column 4 → 8 (Hidden Single)
  4. Row 5 / Column 7 → 2 (Hidden Single)
  5. Row 4 / Column 1 → 6 (Hidden Single)
  6. Locked Pair: 1,3 in r4c78 => r4c269,r6c79<>1, r4c239,r6c79<>3
  7. Row 4 / Column 9 → 8 (Naked Single)
  8. Row 6 / Column 6 → 8 (Hidden Single)
  9. Locked Candidates Type 1 (Pointing): 7 in b3 => r3c46<>7
  10. Locked Candidates Type 1 (Pointing): 1 in b4 => r89c2<>1
  11. Locked Candidates Type 1 (Pointing): 5 in b5 => r6c23<>5
  12. Locked Candidates Type 1 (Pointing): 6 in b6 => r6c45<>6
  13. Locked Candidates Type 1 (Pointing): 2 in b8 => r123c4<>2
  14. Locked Candidates Type 2 (Claiming): 5 in c1 => r89c2,r9c3<>5
  15. Locked Pair: 4,9 in r9c23 => r7c3,r8c2,r9c47<>4, r7c3,r9c79<>9
  16. Row 8 / Column 7 → 4 (Hidden Single)
  17. Row 8 / Column 1 → 5 (Hidden Single)
  18. Row 9 / Column 1 → 1 (Full House)
  19. Row 9 / Column 4 → 2 (Naked Single)
  20. Row 9 / Column 9 → 6 (Naked Single)
  21. Row 6 / Column 9 → 9 (Naked Single)
  22. Row 9 / Column 7 → 5 (Naked Single)
  23. Row 6 / Column 7 → 6 (Naked Single)
  24. Locked Candidates Type 1 (Pointing): 1 in b8 => r7c789<>1
  25. Naked Pair: 1,3 in r48c8 => r2c8<>1, r27c8<>3
  26. Locked Candidates Type 1 (Pointing): 1 in b3 => r1c456<>1
  27. Locked Candidates Type 1 (Pointing): 3 in b3 => r1c45<>3
  28. Locked Pair: 5,6 in r1c45 => r1c3,r3c4<>5, r1c3,r2c45,r3c4<>6
  29. Row 1 / Column 3 → 9 (Naked Single)
  30. Row 3 / Column 4 → 4 (Naked Single)
  31. Row 1 / Column 6 → 2 (Naked Single)
  32. Row 2 / Column 2 → 2 (Naked Single)
  33. Row 2 / Column 3 → 6 (Naked Single)
  34. Row 3 / Column 2 → 5 (Full House)
  35. Row 9 / Column 3 → 4 (Naked Single)
  36. Row 9 / Column 2 → 9 (Full House)
  37. Row 7 / Column 4 → 1 (Naked Single)
  38. Row 7 / Column 5 → 4 (Full House)
  39. Row 3 / Column 6 → 9 (Naked Single)
  40. Row 2 / Column 8 → 9 (Naked Single)
  41. Row 6 / Column 3 → 3 (Naked Single)
  42. Row 3 / Column 7 → 7 (Naked Single)
  43. Row 7 / Column 8 → 2 (Naked Single)
  44. Row 6 / Column 4 → 5 (Naked Single)
  45. Row 7 / Column 3 → 7 (Naked Single)
  46. Row 4 / Column 3 → 5 (Full House)
  47. Row 8 / Column 2 → 3 (Full House)
  48. Row 3 / Column 9 → 2 (Naked Single)
  49. Row 3 / Column 8 → 6 (Full House)
  50. Row 1 / Column 4 → 6 (Naked Single)
  51. Row 6 / Column 5 → 1 (Naked Single)
  52. Row 6 / Column 2 → 4 (Full House)
  53. Row 7 / Column 9 → 3 (Naked Single)
  54. Row 7 / Column 7 → 9 (Full House)
  55. Row 8 / Column 8 → 1 (Naked Single)
  56. Row 4 / Column 8 → 3 (Full House)
  57. Row 8 / Column 9 → 7 (Full House)
  58. Row 1 / Column 9 → 1 (Full House)
  59. Row 4 / Column 7 → 1 (Full House)
  60. Row 1 / Column 7 → 3 (Full House)
  61. Row 1 / Column 5 → 5 (Full House)
  62. Row 2 / Column 5 → 3 (Naked Single)
  63. Row 5 / Column 5 → 6 (Full House)
  64. Row 5 / Column 6 → 7 (Naked Single)
  65. Row 4 / Column 2 → 7 (Naked Single)
  66. Row 4 / Column 6 → 4 (Full House)
  67. Row 2 / Column 6 → 1 (Full House)
  68. Row 2 / Column 4 → 7 (Full House)
  69. Row 5 / Column 2 → 1 (Full House)
  70. Row 5 / Column 4 → 3 (Full House)
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