Solution for Evil Sudoku #3181635249744

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

This Sudoku Puzzle has 56 steps and it is solved using Naked Single, Full House, Hidden Single, Naked Pair, undefined, Hidden Rectangle techniques.

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

Solution Steps:

  1. Row 5 / Column 1 → 8 (Naked Single)
  2. Row 5 / Column 9 → 6 (Naked Single)
  3. Row 5 / Column 5 → 7 (Full House)
  4. Row 2 / Column 1 → 9 (Hidden Single)
  5. Row 4 / Column 7 → 5 (Hidden Single)
  6. Row 9 / Column 8 → 8 (Hidden Single)
  7. Row 6 / Column 6 → 9 (Hidden Single)
  8. Row 6 / Column 3 → 7 (Hidden Single)
  9. Row 1 / Column 2 → 6 (Hidden Single)
  10. Row 1 / Column 1 → 2 (Hidden Single)
  11. Row 1 / Column 7 → 3 (Naked Single)
  12. Row 2 / Column 2 → 5 (Hidden Single)
  13. Row 3 / Column 3 → 3 (Hidden Single)
  14. Row 8 / Column 9 → 3 (Hidden Single)
  15. Row 7 / Column 1 → 3 (Hidden Single)
  16. Naked Pair: 1,4 in r8c18 => r8c4<>1, r8c46<>4
  17. X-Wing: 1 r48 c18 => r7c8<>1
  18. X-Wing: 1 r17 c35 => r39c5,r9c3<>1
  19. Hidden Rectangle: 2/9 in r3c79,r9c79 => r9c9<>2
  20. XY-Chain: 1 1- r4c1 -4- r6c2 -1- r3c2 -4- r2c3 -8- r2c9 -2- r6c9 -1 => r4c8,r6c2<>1
  21. Row 4 / Column 8 → 2 (Naked Single)
  22. Row 6 / Column 9 → 1 (Full House)
  23. Row 6 / Column 2 → 4 (Naked Single)
  24. Row 3 / Column 2 → 1 (Full House)
  25. Row 4 / Column 1 → 1 (Full House)
  26. Row 8 / Column 1 → 4 (Full House)
  27. Row 7 / Column 8 → 4 (Naked Single)
  28. Row 8 / Column 8 → 1 (Full House)
  29. Row 9 / Column 9 → 9 (Naked Single)
  30. Row 1 / Column 3 → 8 (Naked Single)
  31. Row 2 / Column 3 → 4 (Full House)
  32. Row 9 / Column 3 → 6 (Naked Single)
  33. Row 7 / Column 3 → 1 (Full House)
  34. Row 1 / Column 6 → 5 (Naked Single)
  35. Row 1 / Column 5 → 1 (Full House)
  36. Row 9 / Column 7 → 2 (Naked Single)
  37. Row 8 / Column 6 → 7 (Naked Single)
  38. Row 3 / Column 7 → 9 (Naked Single)
  39. Row 9 / Column 5 → 4 (Naked Single)
  40. Row 9 / Column 4 → 1 (Full House)
  41. Row 7 / Column 6 → 2 (Naked Single)
  42. Row 8 / Column 7 → 6 (Naked Single)
  43. Row 7 / Column 7 → 7 (Full House)
  44. Row 7 / Column 5 → 6 (Full House)
  45. Row 8 / Column 4 → 5 (Full House)
  46. Row 2 / Column 6 → 8 (Naked Single)
  47. Row 4 / Column 6 → 4 (Full House)
  48. Row 4 / Column 5 → 8 (Naked Single)
  49. Row 4 / Column 4 → 6 (Full House)
  50. Row 6 / Column 4 → 2 (Naked Single)
  51. Row 6 / Column 5 → 5 (Full House)
  52. Row 3 / Column 5 → 2 (Full House)
  53. Row 2 / Column 9 → 2 (Naked Single)
  54. Row 2 / Column 4 → 7 (Full House)
  55. Row 3 / Column 4 → 4 (Full House)
  56. Row 3 / Column 9 → 8 (Full House)
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