Solution for Evil Sudoku #4451298673492

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

This Sudoku Puzzle has 71 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 8 → 3 (Hidden Single)
  2. Row 6 / Column 9 → 5 (Hidden Single)
  3. Row 8 / Column 6 → 3 (Hidden Single)
  4. Row 5 / Column 3 → 5 (Hidden Single)
  5. Row 4 / Column 9 → 1 (Hidden Single)
  6. Locked Pair: 4,8 in r4c23 => r4c178,r6c13<>4, r4c148,r6c13<>8
  7. Row 4 / Column 1 → 3 (Naked Single)
  8. Row 6 / Column 4 → 3 (Hidden Single)
  9. Locked Candidates Type 1 (Pointing): 7 in b1 => r3c46<>7
  10. Locked Candidates Type 1 (Pointing): 1 in b4 => r6c56<>1
  11. Locked Candidates Type 1 (Pointing): 9 in b5 => r6c78<>9
  12. Locked Candidates Type 1 (Pointing): 8 in b6 => r89c8<>8
  13. Locked Candidates Type 1 (Pointing): 5 in b8 => r123c6<>5
  14. Locked Candidates Type 2 (Claiming): 1 in c2 => r1c13,r3c13<>1
  15. Locked Candidates Type 2 (Claiming): 9 in c9 => r89c8,r9c7<>9
  16. Locked Pair: 2,6 in r9c78 => r7c7,r9c13<>6, r7c7,r8c8,r9c36<>2
  17. Row 8 / Column 3 → 2 (Hidden Single)
  18. Row 8 / Column 9 → 9 (Hidden Single)
  19. Row 9 / Column 9 → 8 (Full House)
  20. Row 9 / Column 6 → 5 (Naked Single)
  21. Row 9 / Column 1 → 1 (Naked Single)
  22. Row 6 / Column 1 → 6 (Naked Single)
  23. Row 9 / Column 3 → 9 (Naked Single)
  24. Row 6 / Column 3 → 1 (Naked Single)
  25. Locked Candidates Type 1 (Pointing): 8 in b8 => r7c123<>8
  26. Naked Pair: 4,8 in r48c2 => r27c2<>4, r2c2<>8
  27. Locked Candidates Type 1 (Pointing): 4 in b1 => r1c56<>4
  28. Locked Candidates Type 1 (Pointing): 8 in b1 => r1c456<>8
  29. Locked Pair: 1,9 in r1c56 => r1c7,r2c56,r3c6<>1, r1c7,r3c6<>9
  30. Row 1 / Column 7 → 6 (Naked Single)
  31. Row 3 / Column 6 → 2 (Naked Single)
  32. Row 1 / Column 4 → 5 (Naked Single)
  33. Row 2 / Column 7 → 1 (Naked Single)
  34. Row 2 / Column 8 → 5 (Naked Single)
  35. Row 3 / Column 8 → 9 (Full House)
  36. Row 9 / Column 7 → 2 (Naked Single)
  37. Row 9 / Column 8 → 6 (Full House)
  38. Row 7 / Column 6 → 8 (Naked Single)
  39. Row 7 / Column 5 → 2 (Full House)
  40. Row 3 / Column 4 → 6 (Naked Single)
  41. Row 2 / Column 2 → 6 (Naked Single)
  42. Row 6 / Column 7 → 4 (Naked Single)
  43. Row 3 / Column 3 → 7 (Naked Single)
  44. Row 7 / Column 2 → 5 (Naked Single)
  45. Row 6 / Column 6 → 9 (Naked Single)
  46. Row 7 / Column 7 → 7 (Naked Single)
  47. Row 4 / Column 7 → 9 (Full House)
  48. Row 8 / Column 8 → 4 (Full House)
  49. Row 3 / Column 1 → 5 (Naked Single)
  50. Row 3 / Column 2 → 1 (Full House)
  51. Row 1 / Column 6 → 1 (Naked Single)
  52. Row 6 / Column 5 → 8 (Naked Single)
  53. Row 6 / Column 8 → 2 (Full House)
  54. Row 7 / Column 1 → 4 (Naked Single)
  55. Row 7 / Column 3 → 6 (Full House)
  56. Row 8 / Column 2 → 8 (Naked Single)
  57. Row 4 / Column 2 → 4 (Full House)
  58. Row 8 / Column 1 → 7 (Full House)
  59. Row 1 / Column 1 → 8 (Full House)
  60. Row 4 / Column 3 → 8 (Full House)
  61. Row 1 / Column 3 → 4 (Full House)
  62. Row 1 / Column 5 → 9 (Full House)
  63. Row 2 / Column 5 → 4 (Naked Single)
  64. Row 5 / Column 5 → 1 (Full House)
  65. Row 5 / Column 4 → 7 (Naked Single)
  66. Row 4 / Column 8 → 7 (Naked Single)
  67. Row 4 / Column 4 → 2 (Full House)
  68. Row 2 / Column 4 → 8 (Full House)
  69. Row 2 / Column 6 → 7 (Full House)
  70. Row 5 / Column 6 → 4 (Full House)
  71. Row 5 / Column 8 → 8 (Full House)
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