Solution for Evil Sudoku #2281457293642

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

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

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

Solution Steps:

  1. Row 5 / Column 7 → 7 (Hidden Single)
  2. Row 5 / Column 2 → 5 (Hidden Single)
  3. Row 6 / Column 6 → 4 (Hidden Single)
  4. Row 4 / Column 4 → 7 (Hidden Single)
  5. Row 9 / Column 4 → 4 (Hidden Single)
  6. Row 2 / Column 8 → 1 (Hidden Single)
  7. Row 7 / Column 7 → 3 (Hidden Single)
  8. Row 8 / Column 3 → 7 (Hidden Single)
  9. Row 1 / Column 6 → 5 (Hidden Single)
  10. Row 3 / Column 7 → 5 (Hidden Single)
  11. Row 7 / Column 4 → 6 (Hidden Single)
  12. Row 8 / Column 2 → 4 (Hidden Single)
  13. Row 1 / Column 3 → 4 (Hidden Single)
  14. Row 1 / Column 5 → 3 (Hidden Single)
  15. Row 5 / Column 6 → 3 (Hidden Single)
  16. Row 3 / Column 4 → 1 (Hidden Single)
  17. Row 2 / Column 9 → 4 (Hidden Single)
  18. Locked Candidates Type 1 (Pointing): 9 in b4 => r4c8<>9
  19. Locked Candidates Type 1 (Pointing): 1 in b5 => r9c5<>1
  20. Locked Candidates Type 1 (Pointing): 2 in b6 => r8c8<>2
  21. Naked Pair: 6,8 in r35c3 => r4c3<>8
  22. X-Wing: 6 c27 r69 => r6c89,r9c1<>6
  23. Swordfish: 2 r378 c169 => r29c1,r9c6<>2
  24. Row 9 / Column 1 → 9 (Naked Single)
  25. Row 7 / Column 3 → 1 (Naked Single)
  26. Row 4 / Column 3 → 9 (Naked Single)
  27. Row 9 / Column 6 → 1 (Hidden Single)
  28. Naked Pair: 3,8 in r24c1 => r3c1<>8
  29. Empty Rectangle: 8 in b2 (r35c3) => r5c4<>8
  30. Row 5 / Column 4 → 2 (Naked Single)
  31. Row 2 / Column 2 → 2 (Hidden Single)
  32. Row 3 / Column 1 → 6 (Naked Single)
  33. Row 9 / Column 2 → 6 (Naked Single)
  34. Row 8 / Column 1 → 2 (Full House)
  35. Row 3 / Column 3 → 8 (Naked Single)
  36. Row 2 / Column 1 → 3 (Full House)
  37. Row 3 / Column 6 → 2 (Full House)
  38. Row 5 / Column 3 → 6 (Full House)
  39. Row 4 / Column 1 → 8 (Full House)
  40. Row 5 / Column 8 → 8 (Full House)
  41. Row 9 / Column 7 → 8 (Naked Single)
  42. Row 9 / Column 5 → 2 (Full House)
  43. Row 7 / Column 6 → 9 (Naked Single)
  44. Row 7 / Column 9 → 2 (Full House)
  45. Row 8 / Column 6 → 8 (Full House)
  46. Row 4 / Column 5 → 1 (Naked Single)
  47. Row 6 / Column 5 → 8 (Full House)
  48. Row 6 / Column 9 → 9 (Naked Single)
  49. Row 2 / Column 7 → 9 (Naked Single)
  50. Row 6 / Column 7 → 6 (Full House)
  51. Row 2 / Column 4 → 8 (Full House)
  52. Row 1 / Column 4 → 9 (Full House)
  53. Row 4 / Column 2 → 3 (Naked Single)
  54. Row 4 / Column 8 → 2 (Full House)
  55. Row 6 / Column 8 → 3 (Full House)
  56. Row 6 / Column 2 → 1 (Full House)
  57. Row 8 / Column 9 → 6 (Naked Single)
  58. Row 1 / Column 9 → 8 (Full House)
  59. Row 1 / Column 8 → 6 (Full House)
  60. Row 8 / Column 8 → 9 (Full House)
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