Solution for Evil Sudoku #2498175623492

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

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 2 / Column 6 → 3 (Hidden Single)
  2. Row 9 / Column 8 → 3 (Hidden Single)
  3. Row 4 / Column 9 → 9 (Hidden Single)
  4. Row 5 / Column 3 → 9 (Hidden Single)
  5. Row 6 / Column 9 → 8 (Hidden Single)
  6. Locked Pair: 4,5 in r6c23 => r4c13,r6c178<>4, r4c13,r6c148<>5
  7. Row 6 / Column 1 → 3 (Naked Single)
  8. Row 4 / Column 4 → 3 (Hidden Single)
  9. Locked Candidates Type 1 (Pointing): 9 in b2 => r789c6<>9
  10. Locked Candidates Type 1 (Pointing): 8 in b4 => r4c56<>8
  11. Locked Candidates Type 1 (Pointing): 7 in b5 => r4c78<>7
  12. Locked Candidates Type 1 (Pointing): 5 in b6 => r12c8<>5
  13. Locked Candidates Type 1 (Pointing): 2 in b7 => r7c46<>2
  14. Locked Candidates Type 2 (Claiming): 8 in c2 => r7c13,r9c13<>8
  15. Locked Candidates Type 2 (Claiming): 7 in c9 => r1c78,r2c8<>7
  16. Locked Pair: 1,6 in r1c78 => r1c13,r3c7<>6, r1c36,r2c8,r3c7<>1
  17. Row 2 / Column 3 → 1 (Hidden Single)
  18. Row 2 / Column 9 → 7 (Hidden Single)
  19. Row 1 / Column 9 → 5 (Full House)
  20. Row 1 / Column 6 → 9 (Naked Single)
  21. Row 1 / Column 1 → 8 (Naked Single)
  22. Row 1 / Column 3 → 7 (Naked Single)
  23. Row 4 / Column 1 → 6 (Naked Single)
  24. Row 4 / Column 3 → 8 (Naked Single)
  25. Locked Candidates Type 1 (Pointing): 5 in b2 => r3c123<>5
  26. Naked Pair: 4,5 in r26c2 => r38c2<>4, r8c2<>5
  27. Locked Candidates Type 1 (Pointing): 4 in b7 => r9c56<>4
  28. Locked Candidates Type 1 (Pointing): 5 in b7 => r9c456<>5
  29. Locked Pair: 7,8 in r9c56 => r7c6,r9c7<>7, r78c6,r8c5,r9c7<>8
  30. Row 9 / Column 7 → 6 (Naked Single)
  31. Row 7 / Column 6 → 1 (Naked Single)
  32. Row 1 / Column 7 → 1 (Naked Single)
  33. Row 1 / Column 8 → 6 (Full House)
  34. Row 8 / Column 7 → 8 (Naked Single)
  35. Row 8 / Column 8 → 9 (Naked Single)
  36. Row 7 / Column 8 → 7 (Full House)
  37. Row 9 / Column 4 → 9 (Naked Single)
  38. Row 3 / Column 6 → 5 (Naked Single)
  39. Row 3 / Column 5 → 1 (Full House)
  40. Row 4 / Column 7 → 4 (Naked Single)
  41. Row 8 / Column 2 → 6 (Naked Single)
  42. Row 7 / Column 4 → 6 (Naked Single)
  43. Row 3 / Column 7 → 2 (Naked Single)
  44. Row 2 / Column 8 → 4 (Full House)
  45. Row 6 / Column 7 → 7 (Full House)
  46. Row 4 / Column 6 → 7 (Naked Single)
  47. Row 3 / Column 2 → 9 (Naked Single)
  48. Row 7 / Column 3 → 2 (Naked Single)
  49. Row 2 / Column 2 → 5 (Naked Single)
  50. Row 2 / Column 1 → 2 (Full House)
  51. Row 4 / Column 5 → 5 (Naked Single)
  52. Row 4 / Column 8 → 1 (Full House)
  53. Row 9 / Column 6 → 8 (Naked Single)
  54. Row 3 / Column 1 → 4 (Naked Single)
  55. Row 3 / Column 3 → 6 (Full House)
  56. Row 7 / Column 2 → 8 (Naked Single)
  57. Row 7 / Column 1 → 9 (Full House)
  58. Row 6 / Column 2 → 4 (Full House)
  59. Row 9 / Column 1 → 5 (Full House)
  60. Row 6 / Column 3 → 5 (Full House)
  61. Row 9 / Column 3 → 4 (Full House)
  62. Row 9 / Column 5 → 7 (Full House)
  63. Row 5 / Column 4 → 2 (Naked Single)
  64. Row 8 / Column 5 → 4 (Naked Single)
  65. Row 5 / Column 5 → 8 (Full House)
  66. Row 6 / Column 8 → 2 (Naked Single)
  67. Row 5 / Column 8 → 5 (Full House)
  68. Row 5 / Column 6 → 4 (Full House)
  69. Row 6 / Column 4 → 1 (Full House)
  70. Row 8 / Column 4 → 5 (Full House)
  71. Row 8 / Column 6 → 2 (Full House)
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