Solution for Evil Sudoku #1215713524895

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

This Sudoku Puzzle has 58 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Pair, Full House, Naked Single techniques.

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Solution Steps:

  1. Row 2 / Column 4 → 1 (Hidden Single)
  2. Row 4 / Column 8 → 5 (Hidden Single)
  3. Row 7 / Column 8 → 1 (Hidden Single)
  4. Row 2 / Column 7 → 5 (Hidden Single)
  5. Row 7 / Column 1 → 5 (Hidden Single)
  6. Row 2 / Column 3 → 7 (Hidden Single)
  7. Row 9 / Column 4 → 7 (Hidden Single)
  8. Row 1 / Column 6 → 7 (Hidden Single)
  9. Row 4 / Column 2 → 8 (Hidden Single)
  10. Row 3 / Column 2 → 5 (Hidden Single)
  11. Row 1 / Column 5 → 5 (Hidden Single)
  12. Row 2 / Column 2 → 3 (Hidden Single)
  13. Row 8 / Column 8 → 7 (Hidden Single)
  14. Row 5 / Column 9 → 7 (Hidden Single)
  15. Row 7 / Column 4 → 2 (Hidden Single)
  16. Row 3 / Column 4 → 8 (Hidden Single)
  17. Row 9 / Column 5 → 8 (Hidden Single)
  18. Row 8 / Column 7 → 8 (Hidden Single)
  19. Row 1 / Column 9 → 8 (Hidden Single)
  20. Row 6 / Column 8 → 8 (Hidden Single)
  21. Row 3 / Column 9 → 4 (Hidden Single)
  22. Row 9 / Column 9 → 2 (Hidden Single)
  23. Row 1 / Column 8 → 2 (Hidden Single)
  24. Locked Candidates Type 1 (Pointing): 6 in b2 => r3c13<>6
  25. Locked Pair: 2,9 in r3c13 => r1c13,r3c56<>9
  26. Row 3 / Column 5 → 6 (Full House)
  27. Row 3 / Column 6 → 6 (Full House)
  28. Locked Pair: 3,9 in r7c56 => r7c7,r8c6<>3, r7c79,r8c6<>9
  29. Row 7 / Column 7 → 6 (Naked Single)
  30. Row 7 / Column 9 → 6 (Naked Single)
  31. Row 8 / Column 6 → 9 (Naked Single)
  32. Row 2 / Column 9 → 9 (Naked Single)
  33. Row 2 / Column 8 → 6 (Full House)
  34. Row 5 / Column 8 → 9 (Full House)
  35. Row 7 / Column 5 → 3 (Full House)
  36. Row 5 / Column 5 → 3 (Full House)
  37. Row 6 / Column 6 → 4 (Naked Single)
  38. Row 7 / Column 6 → 3 (Naked Single)
  39. Row 4 / Column 6 → 4 (Naked Single)
  40. Row 6 / Column 7 → 2 (Naked Single)
  41. Row 5 / Column 7 → 4 (Full House)
  42. Row 9 / Column 7 → 3 (Hidden Single)
  43. Row 4 / Column 3 → 3 (Hidden Single)
  44. Row 1 / Column 1 → 4 (Hidden Single)
  45. Row 1 / Column 3 → 6 (Full House)
  46. Row 5 / Column 3 → 2 (Naked Single)
  47. Row 8 / Column 3 → 2 (Naked Single)
  48. Row 3 / Column 3 → 9 (Naked Single)
  49. Row 3 / Column 1 → 2 (Full House)
  50. Row 5 / Column 1 → 6 (Naked Single)
  51. Row 5 / Column 2 → 6 (Naked Single)
  52. Row 9 / Column 1 → 9 (Full House)
  53. Row 8 / Column 1 → 3 (Full House)
  54. Row 9 / Column 2 → 9 (Full House)
  55. Row 8 / Column 2 → 6 (Naked Single)
  56. Row 6 / Column 2 → 9 (Naked Single)
  57. Row 6 / Column 4 → 6 (Naked Single)
  58. Row 4 / Column 4 → 9 (Full House)
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