Solution for Evil Sudoku #3492316854744

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

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 1 / Column 5 → 9 (Naked Single)
  2. Row 9 / Column 5 → 3 (Naked Single)
  3. Row 5 / Column 5 → 7 (Full House)
  4. Row 3 / Column 4 → 7 (Hidden Single)
  5. Row 1 / Column 8 → 4 (Hidden Single)
  6. Row 6 / Column 4 → 4 (Hidden Single)
  7. Row 2 / Column 9 → 3 (Hidden Single)
  8. Row 8 / Column 1 → 9 (Hidden Single)
  9. Row 7 / Column 6 → 6 (Hidden Single)
  10. Row 1 / Column 9 → 8 (Hidden Single)
  11. Row 7 / Column 9 → 1 (Naked Single)
  12. Row 2 / Column 8 → 6 (Hidden Single)
  13. Row 3 / Column 7 → 1 (Hidden Single)
  14. Row 9 / Column 2 → 1 (Hidden Single)
  15. Row 1 / Column 3 → 1 (Hidden Single)
  16. Naked Pair: 2,5 in r18c2 => r4c2<>2, r46c2<>5
  17. X-Wing: 2 c26 r18 => r8c3<>2
  18. X-Wing: 2 c39 r35 => r35c1,r5c7<>2
  19. Hidden Rectangle: 4/8 in r7c17,r9c17 => r9c1<>8
  20. XY-Chain: 5 5- r1c2 -2- r1c6 -5- r2c4 -2- r9c4 -8- r9c8 -9- r3c8 -5 => r3c13<>5
  21. Row 3 / Column 1 → 3 (Naked Single)
  22. Row 3 / Column 3 → 2 (Naked Single)
  23. Row 1 / Column 2 → 5 (Full House)
  24. Row 1 / Column 6 → 2 (Full House)
  25. Row 2 / Column 4 → 5 (Full House)
  26. Row 2 / Column 7 → 2 (Full House)
  27. Row 3 / Column 9 → 9 (Naked Single)
  28. Row 3 / Column 8 → 5 (Full House)
  29. Row 8 / Column 2 → 2 (Naked Single)
  30. Row 8 / Column 6 → 8 (Naked Single)
  31. Row 8 / Column 3 → 5 (Full House)
  32. Row 9 / Column 4 → 2 (Full House)
  33. Row 6 / Column 9 → 6 (Naked Single)
  34. Row 5 / Column 9 → 2 (Full House)
  35. Row 9 / Column 1 → 4 (Naked Single)
  36. Row 6 / Column 2 → 7 (Naked Single)
  37. Row 7 / Column 1 → 8 (Naked Single)
  38. Row 6 / Column 3 → 8 (Naked Single)
  39. Row 7 / Column 2 → 3 (Naked Single)
  40. Row 4 / Column 2 → 6 (Full House)
  41. Row 7 / Column 3 → 7 (Full House)
  42. Row 7 / Column 7 → 4 (Full House)
  43. Row 5 / Column 3 → 3 (Full House)
  44. Row 5 / Column 1 → 5 (Naked Single)
  45. Row 4 / Column 1 → 2 (Full House)
  46. Row 6 / Column 8 → 9 (Naked Single)
  47. Row 6 / Column 6 → 5 (Full House)
  48. Row 4 / Column 4 → 8 (Naked Single)
  49. Row 5 / Column 4 → 6 (Full House)
  50. Row 5 / Column 6 → 9 (Naked Single)
  51. Row 5 / Column 7 → 8 (Full House)
  52. Row 4 / Column 6 → 3 (Full House)
  53. Row 9 / Column 8 → 8 (Naked Single)
  54. Row 4 / Column 8 → 7 (Full House)
  55. Row 4 / Column 7 → 5 (Full House)
  56. Row 9 / Column 7 → 9 (Full House)
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