Solution for Evil Sudoku #2156491783243

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

This Sudoku Puzzle has 60 steps and it is solved using Naked Single, Hidden Single, Full House, Locked Candidates Type 1 (Pointing), undefined, Naked Pair, Empty Rectangle techniques.

Naked Single Explanation
Hidden Single Explanation
Locked Candidates Explanation
Full House Explanation
Try To Solve This Puzzle

Solution Steps:

  1. Row 7 / Column 4 → 8 (Naked Single)
  2. Row 8 / Column 4 → 1 (Naked Single)
  3. Row 2 / Column 2 → 1 (Hidden Single)
  4. Row 5 / Column 6 → 2 (Hidden Single)
  5. Row 3 / Column 6 → 5 (Hidden Single)
  6. Row 4 / Column 6 → 6 (Naked Single)
  7. Row 4 / Column 5 → 1 (Naked Single)
  8. Row 8 / Column 6 → 7 (Naked Single)
  9. Row 2 / Column 6 → 4 (Full House)
  10. Row 4 / Column 7 → 5 (Naked Single)
  11. Row 4 / Column 1 → 9 (Full House)
  12. Row 5 / Column 2 → 8 (Hidden Single)
  13. Row 6 / Column 9 → 9 (Hidden Single)
  14. Row 2 / Column 4 → 9 (Hidden Single)
  15. Row 5 / Column 7 → 1 (Hidden Single)
  16. Row 9 / Column 3 → 1 (Hidden Single)
  17. Row 6 / Column 5 → 4 (Hidden Single)
  18. Row 3 / Column 3 → 9 (Hidden Single)
  19. Row 1 / Column 8 → 9 (Hidden Single)
  20. Row 7 / Column 3 → 7 (Hidden Single)
  21. Row 1 / Column 7 → 8 (Hidden Single)
  22. Row 9 / Column 8 → 8 (Hidden Single)
  23. Row 8 / Column 8 → 5 (Hidden Single)
  24. Locked Candidates Type 1 (Pointing): 4 in b1 => r1c9<>4
  25. X-Wing: 2 r27 c18 => r9c1<>2
  26. X-Wing: 6 r27 c17 => r159c1,r9c7<>6
  27. Row 5 / Column 3 → 6 (Hidden Single)
  28. Naked Pair: 3,5 in r59c1 => r12c1<>3, r1c1<>5
  29. Row 1 / Column 1 → 4 (Naked Single)
  30. Row 8 / Column 3 → 4 (Hidden Single)
  31. Empty Rectangle: 3 in b1 (r8c29) => r1c9<>3
  32. XY-Wing: 2/7/6 in r1c9,r2c18 => r1c2,r2c7<>6
  33. Row 1 / Column 9 → 6 (Hidden Single)
  34. Row 2 / Column 1 → 6 (Hidden Single)
  35. Row 7 / Column 1 → 2 (Naked Single)
  36. Row 7 / Column 8 → 4 (Naked Single)
  37. Row 7 / Column 7 → 6 (Full House)
  38. Row 5 / Column 8 → 7 (Naked Single)
  39. Row 2 / Column 8 → 2 (Full House)
  40. Row 5 / Column 9 → 4 (Full House)
  41. Row 3 / Column 9 → 3 (Naked Single)
  42. Row 2 / Column 7 → 7 (Naked Single)
  43. Row 3 / Column 7 → 4 (Full House)
  44. Row 3 / Column 2 → 2 (Full House)
  45. Row 2 / Column 5 → 3 (Full House)
  46. Row 9 / Column 7 → 3 (Full House)
  47. Row 1 / Column 5 → 7 (Full House)
  48. Row 8 / Column 9 → 2 (Naked Single)
  49. Row 9 / Column 9 → 7 (Full House)
  50. Row 9 / Column 1 → 5 (Naked Single)
  51. Row 5 / Column 1 → 3 (Full House)
  52. Row 5 / Column 4 → 5 (Full House)
  53. Row 6 / Column 3 → 5 (Full House)
  54. Row 6 / Column 4 → 3 (Full House)
  55. Row 1 / Column 3 → 3 (Full House)
  56. Row 1 / Column 2 → 5 (Full House)
  57. Row 8 / Column 5 → 6 (Naked Single)
  58. Row 8 / Column 2 → 3 (Full House)
  59. Row 9 / Column 2 → 6 (Full House)
  60. Row 9 / Column 5 → 2 (Full House)
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