Solution for Evil Sudoku #4223768514939

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

This Sudoku Puzzle has 56 steps and it is solved using Hidden Single, Full House, Locked Candidates Type 1 (Pointing), Naked Triple, undefined, Naked Single techniques.

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Solution Steps:

  1. Row 6 / Column 3 → 7 (Hidden Single)
  2. Row 4 / Column 4 → 7 (Hidden Single)
  3. Row 3 / Column 5 → 2 (Hidden Single)
  4. Row 7 / Column 3 → 9 (Hidden Single)
  5. Row 9 / Column 6 → 2 (Hidden Single)
  6. Row 2 / Column 9 → 2 (Hidden Single)
  7. Row 8 / Column 8 → 2 (Hidden Single)
  8. Row 9 / Column 2 → 7 (Hidden Single)
  9. Row 4 / Column 2 → 6 (Hidden Single)
  10. Row 6 / Column 6 → 6 (Hidden Single)
  11. Row 7 / Column 5 → 4 (Hidden Single)
  12. Row 1 / Column 6 → 9 (Hidden Single)
  13. Row 8 / Column 7 → 8 (Hidden Single)
  14. Row 9 / Column 1 → 6 (Hidden Single)
  15. Row 5 / Column 8 → 6 (Hidden Single)
  16. Row 3 / Column 3 → 6 (Hidden Single)
  17. Row 5 / Column 2 → 1 (Hidden Single)
  18. Row 7 / Column 4 → 6 (Hidden Single)
  19. Row 1 / Column 4 → 1 (Hidden Single)
  20. Row 3 / Column 6 → 4 (Hidden Single)
  21. Row 8 / Column 6 → 1 (Hidden Single)
  22. Row 7 / Column 6 → 3 (Full House)
  23. Row 9 / Column 4 → 5 (Full House)
  24. Row 9 / Column 7 → 3 (Full House)
  25. Locked Candidates Type 1 (Pointing): 9 in b4 => r3c1<>9
  26. Naked Triple: 1,3,5 in r4c79,r6c8 => r5c9<>3
  27. W-Wing: 1/5 in r4c7,r7c8 connected by 5 in r47c9 => r6c8,r7c7<>1
  28. Row 6 / Column 8 → 3 (Naked Single)
  29. Row 1 / Column 8 → 8 (Naked Single)
  30. Row 4 / Column 9 → 5 (Naked Single)
  31. Row 6 / Column 1 → 9 (Naked Single)
  32. Row 6 / Column 5 → 1 (Full House)
  33. Row 2 / Column 8 → 5 (Naked Single)
  34. Row 7 / Column 8 → 1 (Full House)
  35. Row 4 / Column 7 → 1 (Naked Single)
  36. Row 4 / Column 5 → 3 (Full House)
  37. Row 5 / Column 5 → 9 (Full House)
  38. Row 7 / Column 9 → 7 (Naked Single)
  39. Row 7 / Column 7 → 5 (Full House)
  40. Row 3 / Column 7 → 9 (Naked Single)
  41. Row 5 / Column 9 → 4 (Naked Single)
  42. Row 1 / Column 9 → 3 (Full House)
  43. Row 2 / Column 7 → 4 (Full House)
  44. Row 5 / Column 7 → 7 (Full House)
  45. Row 1 / Column 3 → 4 (Full House)
  46. Row 3 / Column 2 → 3 (Naked Single)
  47. Row 2 / Column 2 → 9 (Naked Single)
  48. Row 8 / Column 2 → 4 (Full House)
  49. Row 2 / Column 3 → 8 (Naked Single)
  50. Row 2 / Column 4 → 3 (Full House)
  51. Row 3 / Column 4 → 8 (Full House)
  52. Row 3 / Column 1 → 5 (Full House)
  53. Row 5 / Column 3 → 3 (Naked Single)
  54. Row 5 / Column 1 → 8 (Full House)
  55. Row 8 / Column 1 → 3 (Full House)
  56. Row 8 / Column 3 → 5 (Full House)
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