Solution for Evil Sudoku #2162948531792

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

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 4 → 6 (Hidden Single)
  2. Row 2 / Column 9 → 1 (Hidden Single)
  3. Row 4 / Column 2 → 1 (Hidden Single)
  4. Row 7 / Column 5 → 6 (Hidden Single)
  5. Row 1 / Column 6 → 2 (Hidden Single)
  6. Locked Pair: 7,8 in r78c6 => r239c6,r79c4<>7, r269c6,r79c4<>8
  7. Row 9 / Column 6 → 1 (Naked Single)
  8. Row 6 / Column 4 → 1 (Hidden Single)
  9. Locked Candidates Type 1 (Pointing): 8 in b2 => r2c12<>8
  10. Locked Candidates Type 1 (Pointing): 6 in b4 => r4c789<>6
  11. Locked Candidates Type 1 (Pointing): 4 in b5 => r23c4<>4
  12. Locked Candidates Type 1 (Pointing): 2 in b8 => r45c4<>2
  13. Locked Candidates Type 1 (Pointing): 3 in b9 => r46c7<>3
  14. Locked Candidates Type 2 (Claiming): 4 in r1 => r2c12,r3c1<>4
  15. Locked Pair: 5,9 in r23c1 => r2c2,r3c3,r47c1<>9, r3c3,r79c1<>5
  16. Row 7 / Column 2 → 9 (Hidden Single)
  17. Row 7 / Column 1 → 4 (Hidden Single)
  18. Row 1 / Column 1 → 8 (Naked Single)
  19. Row 1 / Column 2 → 4 (Full House)
  20. Row 4 / Column 1 → 6 (Naked Single)
  21. Row 9 / Column 1 → 2 (Naked Single)
  22. Row 9 / Column 4 → 5 (Naked Single)
  23. Row 7 / Column 4 → 2 (Naked Single)
  24. Locked Candidates Type 1 (Pointing): 8 in b4 => r789c3<>8
  25. Naked Pair: 7,8 in r8c26 => r8c38<>7, r8c8<>8
  26. Locked Candidates Type 1 (Pointing): 7 in b9 => r45c9<>7
  27. Locked Candidates Type 1 (Pointing): 8 in b9 => r456c9<>8
  28. Locked Pair: 2,4 in r45c9 => r3c9,r4c78,r5c8<>2, r3c9,r4c7<>4
  29. Row 3 / Column 9 → 5 (Naked Single)
  30. Row 4 / Column 7 → 9 (Naked Single)
  31. Row 2 / Column 8 → 6 (Naked Single)
  32. Row 3 / Column 1 → 9 (Naked Single)
  33. Row 2 / Column 1 → 5 (Full House)
  34. Row 3 / Column 8 → 2 (Naked Single)
  35. Row 2 / Column 7 → 4 (Full House)
  36. Row 6 / Column 9 → 6 (Naked Single)
  37. Row 4 / Column 3 → 8 (Naked Single)
  38. Row 5 / Column 3 → 9 (Full House)
  39. Row 3 / Column 4 → 7 (Naked Single)
  40. Row 8 / Column 8 → 5 (Naked Single)
  41. Row 6 / Column 7 → 5 (Naked Single)
  42. Row 3 / Column 3 → 3 (Naked Single)
  43. Row 2 / Column 2 → 7 (Full House)
  44. Row 3 / Column 6 → 4 (Full House)
  45. Row 4 / Column 4 → 4 (Naked Single)
  46. Row 7 / Column 7 → 3 (Naked Single)
  47. Row 8 / Column 3 → 6 (Naked Single)
  48. Row 8 / Column 2 → 8 (Naked Single)
  49. Row 9 / Column 2 → 3 (Full House)
  50. Row 4 / Column 9 → 2 (Naked Single)
  51. Row 5 / Column 4 → 8 (Naked Single)
  52. Row 2 / Column 4 → 9 (Full House)
  53. Row 9 / Column 7 → 6 (Naked Single)
  54. Row 8 / Column 7 → 2 (Full House)
  55. Row 8 / Column 6 → 7 (Full House)
  56. Row 7 / Column 6 → 8 (Full House)
  57. Row 9 / Column 3 → 7 (Naked Single)
  58. Row 7 / Column 3 → 5 (Full House)
  59. Row 7 / Column 9 → 7 (Full House)
  60. Row 9 / Column 9 → 8 (Full House)
  61. Row 5 / Column 9 → 4 (Full House)
  62. Row 5 / Column 8 → 7 (Naked Single)
  63. Row 5 / Column 5 → 2 (Full House)
  64. Row 6 / Column 5 → 3 (Naked Single)
  65. Row 2 / Column 6 → 3 (Naked Single)
  66. Row 2 / Column 5 → 8 (Full House)
  67. Row 4 / Column 5 → 7 (Full House)
  68. Row 4 / Column 8 → 3 (Full House)
  69. Row 6 / Column 6 → 9 (Full House)
  70. Row 6 / Column 8 → 8 (Full House)
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