Solution for Evil Sudoku #4485974132693

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

This Sudoku Puzzle has 61 steps and it is solved using Naked Single, Full House, Hidden Single, Locked Candidates Type 1 (Pointing), Locked Pair techniques.

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Solution Steps:

  1. Row 6 / Column 6 → 2 (Naked Single)
  2. Row 4 / Column 6 → 8 (Naked Single)
  3. Row 6 / Column 5 → 3 (Naked Single)
  4. Row 4 / Column 4 → 7 (Full House)
  5. Row 2 / Column 2 → 1 (Hidden Single)
  6. Row 3 / Column 5 → 7 (Hidden Single)
  7. Row 8 / Column 2 → 7 (Hidden Single)
  8. Row 6 / Column 9 → 1 (Hidden Single)
  9. Row 9 / Column 9 → 7 (Hidden Single)
  10. Row 1 / Column 2 → 2 (Hidden Single)
  11. Row 2 / Column 3 → 9 (Hidden Single)
  12. Row 5 / Column 8 → 7 (Hidden Single)
  13. Row 4 / Column 8 → 5 (Hidden Single)
  14. Locked Candidates Type 1 (Pointing): 5 in b1 => r3c6<>5
  15. Locked Candidates Type 1 (Pointing): 4 in b4 => r3c2<>4
  16. Locked Candidates Type 1 (Pointing): 9 in b4 => r7c2<>9
  17. Locked Pair: 3,6 in r7c23 => r7c189,r9c3<>3, r7c1589,r8c1,r9c3<>6
  18. Row 9 / Column 3 → 5 (Naked Single)
  19. Row 5 / Column 3 → 3 (Naked Single)
  20. Row 9 / Column 6 → 6 (Naked Single)
  21. Row 4 / Column 1 → 6 (Naked Single)
  22. Row 5 / Column 9 → 8 (Naked Single)
  23. Row 7 / Column 3 → 6 (Naked Single)
  24. Row 3 / Column 6 → 4 (Naked Single)
  25. Row 2 / Column 6 → 5 (Full House)
  26. Row 9 / Column 5 → 2 (Naked Single)
  27. Row 1 / Column 1 → 3 (Naked Single)
  28. Row 4 / Column 2 → 4 (Naked Single)
  29. Row 5 / Column 7 → 9 (Naked Single)
  30. Row 5 / Column 2 → 5 (Full House)
  31. Row 6 / Column 2 → 9 (Full House)
  32. Row 7 / Column 2 → 3 (Naked Single)
  33. Row 3 / Column 2 → 6 (Full House)
  34. Row 3 / Column 3 → 8 (Naked Single)
  35. Row 1 / Column 3 → 4 (Full House)
  36. Row 3 / Column 1 → 5 (Full House)
  37. Row 3 / Column 4 → 3 (Full House)
  38. Row 7 / Column 5 → 8 (Naked Single)
  39. Row 9 / Column 4 → 9 (Naked Single)
  40. Row 9 / Column 7 → 3 (Full House)
  41. Row 1 / Column 4 → 8 (Naked Single)
  42. Row 1 / Column 8 → 6 (Full House)
  43. Row 2 / Column 5 → 6 (Naked Single)
  44. Row 8 / Column 5 → 5 (Full House)
  45. Row 2 / Column 4 → 2 (Full House)
  46. Row 4 / Column 7 → 2 (Naked Single)
  47. Row 4 / Column 9 → 3 (Full House)
  48. Row 6 / Column 8 → 4 (Naked Single)
  49. Row 6 / Column 7 → 6 (Full House)
  50. Row 2 / Column 9 → 4 (Naked Single)
  51. Row 7 / Column 8 → 9 (Naked Single)
  52. Row 2 / Column 7 → 8 (Naked Single)
  53. Row 2 / Column 8 → 3 (Full House)
  54. Row 8 / Column 8 → 8 (Full House)
  55. Row 8 / Column 7 → 4 (Full House)
  56. Row 7 / Column 9 → 2 (Naked Single)
  57. Row 8 / Column 9 → 6 (Full House)
  58. Row 7 / Column 1 → 1 (Naked Single)
  59. Row 7 / Column 4 → 4 (Full House)
  60. Row 8 / Column 4 → 1 (Full House)
  61. Row 8 / Column 1 → 9 (Full House)
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