Solution for Evil Sudoku #1242713524895

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

This Sudoku Puzzle has 62 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 5 / Column 1 → 1 (Hidden Single)
  2. Row 3 / Column 3 → 4 (Hidden Single)
  3. Locked Candidates Type 1 (Pointing): 8 in b8 => r9c79<>8
  4. Locked Candidates Type 2 (Claiming): 3 in c1 => r8c23,r9c2<>3
  5. Locked Candidates Type 2 (Claiming): 8 in c9 => r1c8<>8
  6. Naked Pair: 6,9 in r47c4 => r2369c4<>6, r2369c4<>9
  7. Row 6 / Column 4 → 1 (Naked Single)
  8. Row 2 / Column 4 → 7 (Naked Single)
  9. Row 3 / Column 4 → 8 (Naked Single)
  10. Row 9 / Column 4 → 8 (Naked Single)
  11. Row 3 / Column 6 → 1 (Hidden Single)
  12. Row 1 / Column 3 → 7 (Hidden Single)
  13. Row 8 / Column 6 → 7 (Hidden Single)
  14. Row 9 / Column 9 → 7 (Hidden Single)
  15. Row 1 / Column 9 → 8 (Hidden Single)
  16. Row 5 / Column 8 → 7 (Hidden Single)
  17. Naked Pair: 6,9 in r4c4,r6c6 => r4c6,r5c5<>6, r4c6,r5c5<>9
  18. Row 4 / Column 6 → 3 (Naked Single)
  19. Row 5 / Column 5 → 3 (Naked Single)
  20. Row 2 / Column 2 → 3 (Hidden Single)
  21. Locked Pair: 6,9 in r5c23 => r4c23,r5c79,r6c2<>6, r4c23,r5c79,r6c2<>9
  22. Row 5 / Column 7 → 2 (Naked Single)
  23. Row 5 / Column 9 → 2 (Naked Single)
  24. Row 4 / Column 3 → 5 (Naked Single)
  25. Row 4 / Column 2 → 8 (Naked Single)
  26. Row 6 / Column 2 → 8 (Naked Single)
  27. Row 1 / Column 8 → 2 (Hidden Single)
  28. Row 8 / Column 7 → 8 (Hidden Single)
  29. Row 7 / Column 1 → 2 (Hidden Single)
  30. Row 8 / Column 1 → 3 (Hidden Single)
  31. Row 3 / Column 2 → 2 (Hidden Single)
  32. Row 7 / Column 7 → 3 (Hidden Single)
  33. Row 9 / Column 2 → 5 (Hidden Single)
  34. Locked Pair: 6,9 in r8c23 => r8c8,r9c1<>6, r8c8,r9c1<>9
  35. Row 8 / Column 8 → 9 (Naked Single)
  36. Row 9 / Column 1 → 9 (Naked Single)
  37. Row 4 / Column 8 → 6 (Naked Single)
  38. Row 4 / Column 4 → 9 (Full House)
  39. Row 8 / Column 2 → 6 (Naked Single)
  40. Row 8 / Column 3 → 6 (Naked Single)
  41. Row 9 / Column 7 → 6 (Naked Single)
  42. Row 9 / Column 5 → 6 (Naked Single)
  43. Row 6 / Column 8 → 5 (Naked Single)
  44. Row 7 / Column 8 → 1 (Naked Single)
  45. Row 6 / Column 6 → 6 (Naked Single)
  46. Row 7 / Column 4 → 6 (Naked Single)
  47. Row 5 / Column 2 → 9 (Naked Single)
  48. Row 2 / Column 3 → 9 (Naked Single)
  49. Row 5 / Column 3 → 9 (Naked Single)
  50. Row 7 / Column 9 → 1 (Naked Single)
  51. Row 2 / Column 8 → 1 (Naked Single)
  52. Row 6 / Column 7 → 9 (Naked Single)
  53. Row 2 / Column 7 → 5 (Full House)
  54. Row 2 / Column 9 → 6 (Naked Single)
  55. Row 3 / Column 9 → 9 (Naked Single)
  56. Row 3 / Column 5 → 5 (Naked Single)
  57. Row 1 / Column 5 → 9 (Full House)
  58. Row 1 / Column 6 → 9 (Full House)
  59. Row 3 / Column 1 → 6 (Full House)
  60. Row 1 / Column 1 → 5 (Full House)
  61. Row 7 / Column 5 → 9 (Naked Single)
  62. Row 7 / Column 6 → 5 (Naked Single)
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