Solution for Evil Sudoku #3337281954644

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

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

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Solution Steps:

  1. Row 5 / Column 1 → 2 (Naked Single)
  2. Row 5 / Column 9 → 3 (Naked Single)
  3. Row 5 / Column 5 → 6 (Full House)
  4. Row 6 / Column 3 → 1 (Hidden Single)
  5. Row 4 / Column 7 → 6 (Hidden Single)
  6. Row 9 / Column 8 → 2 (Hidden Single)
  7. Row 1 / Column 2 → 3 (Hidden Single)
  8. Row 4 / Column 4 → 4 (Hidden Single)
  9. Row 8 / Column 9 → 4 (Hidden Single)
  10. Row 8 / Column 8 → 1 (Hidden Single)
  11. Row 9 / Column 9 → 9 (Hidden Single)
  12. Row 9 / Column 3 → 8 (Naked Single)
  13. Row 2 / Column 1 → 8 (Hidden Single)
  14. Row 7 / Column 7 → 8 (Hidden Single)
  15. Row 3 / Column 9 → 8 (Hidden Single)
  16. Naked Pair: 5,7 in r2c29 => r2c46<>5, r2c6<>7
  17. X-Wing: 7 r26 c29 => r3c2<>7
  18. X-Wing: 7 r39 c57 => r1c57,r7c5<>7
  19. Hidden Rectangle: 4/9 in r1c13,r7c13 => r1c1<>9
  20. XY-Chain: 5 5- r2c9 -7- r6c9 -5- r4c8 -7- r4c1 -9- r8c1 -3- r8c7 -5 => r13c7<>5
  21. Row 1 / Column 7 → 2 (Naked Single)
  22. Row 3 / Column 7 → 7 (Naked Single)
  23. Row 2 / Column 9 → 5 (Full House)
  24. Row 6 / Column 9 → 7 (Full House)
  25. Row 4 / Column 8 → 5 (Full House)
  26. Row 7 / Column 8 → 7 (Full House)
  27. Row 9 / Column 7 → 3 (Naked Single)
  28. Row 8 / Column 7 → 5 (Full House)
  29. Row 2 / Column 2 → 7 (Naked Single)
  30. Row 6 / Column 2 → 9 (Naked Single)
  31. Row 3 / Column 2 → 5 (Full House)
  32. Row 4 / Column 1 → 7 (Full House)
  33. Row 9 / Column 4 → 1 (Naked Single)
  34. Row 9 / Column 5 → 7 (Full House)
  35. Row 1 / Column 1 → 4 (Naked Single)
  36. Row 2 / Column 4 → 6 (Naked Single)
  37. Row 1 / Column 3 → 9 (Naked Single)
  38. Row 2 / Column 3 → 2 (Naked Single)
  39. Row 2 / Column 6 → 1 (Full House)
  40. Row 3 / Column 3 → 6 (Full House)
  41. Row 7 / Column 3 → 4 (Full House)
  42. Row 3 / Column 4 → 9 (Naked Single)
  43. Row 3 / Column 5 → 2 (Full House)
  44. Row 1 / Column 5 → 5 (Naked Single)
  45. Row 1 / Column 6 → 7 (Full House)
  46. Row 4 / Column 6 → 9 (Naked Single)
  47. Row 4 / Column 5 → 1 (Full House)
  48. Row 8 / Column 4 → 3 (Naked Single)
  49. Row 6 / Column 4 → 5 (Full House)
  50. Row 6 / Column 5 → 3 (Naked Single)
  51. Row 7 / Column 5 → 9 (Full House)
  52. Row 6 / Column 6 → 2 (Full House)
  53. Row 7 / Column 6 → 5 (Naked Single)
  54. Row 8 / Column 6 → 6 (Full House)
  55. Row 8 / Column 1 → 9 (Full House)
  56. Row 7 / Column 1 → 3 (Full House)
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