Solution for Evil Sudoku #1217713524895

1
8
3
4
2
1
7
3
7
1
7
2
5
8
7
1
1
3
7
8
1
4
1
7
5
4

This Sudoku Puzzle has 54 steps and it is solved using Hidden Single, Locked Pair, Naked Single, Full House, Give Up techniques.

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Solution Steps:

  1. Row 2 / Column 4 → 1 (Hidden Single)
  2. Row 7 / Column 8 → 1 (Hidden Single)
  3. Row 8 / Column 8 → 7 (Hidden Single)
  4. Row 5 / Column 9 → 7 (Hidden Single)
  5. Row 7 / Column 1 → 4 (Hidden Single)
  6. Row 8 / Column 7 → 8 (Hidden Single)
  7. Locked Pair: 6,9 in r46c4 => r379c4,r46c6,r5c5<>6, r379c4,r46c6,r5c5<>9
  8. Row 3 / Column 4 → 8 (Naked Single)
  9. Row 7 / Column 4 → 2 (Naked Single)
  10. Row 5 / Column 5 → 3 (Naked Single)
  11. Row 6 / Column 6 → 4 (Naked Single)
  12. Row 9 / Column 4 → 2 (Naked Single)
  13. Row 4 / Column 6 → 4 (Naked Single)
  14. Row 9 / Column 5 → 8 (Hidden Single)
  15. Row 1 / Column 9 → 8 (Hidden Single)
  16. Row 5 / Column 7 → 4 (Hidden Single)
  17. Row 3 / Column 9 → 2 (Hidden Single)
  18. Row 1 / Column 3 → 4 (Hidden Single)
  19. Row 6 / Column 7 → 2 (Hidden Single)
  20. Locked Pair: 6,9 in r79c9 => r2c9,r79c7<>6, r2c9,r79c7<>9
  21. Row 2 / Column 9 → 9 (Naked Single)
  22. Row 7 / Column 7 → 3 (Naked Single)
  23. Row 9 / Column 7 → 3 (Naked Single)
  24. Row 7 / Column 9 → 6 (Naked Single)
  25. Row 9 / Column 9 → 6 (Naked Single)
  26. Row 1 / Column 1 → 2 (Hidden Single)
  27. Row 2 / Column 7 → 5 (Hidden Single)
  28. Row 1 / Column 8 → 6 (Naked Single)
  29. Row 2 / Column 8 → 6 (Naked Single)
  30. Row 5 / Column 8 → 9 (Naked Single)
  31. Row 2 / Column 2 → 3 (Naked Single)
  32. Row 2 / Column 3 → 3 (Naked Single)
  33. Row 5 / Column 1 → 6 (Naked Single)
  34. Row 5 / Column 2 → 2 (Full House)
  35. Row 5 / Column 3 → 2 (Full House)
  36. Row 8 / Column 6 → 3 (Hidden Single)
  37. Row 8 / Column 1 → 9 (Naked Single)
  38. Row 3 / Column 1 → 5 (Full House)
  39. Row 8 / Column 2 → 6 (Full House)
  40. Row 8 / Column 3 → 6 (Full House)
  41. Row 9 / Column 1 → 5 (Full House)
  42. Row 9 / Column 2 → 5 (Naked Single)
  43. Row 3 / Column 2 → 9 (Naked Single)
  44. Row 3 / Column 3 → 9 (Naked Single)
  45. Row 3 / Column 5 → 6 (Naked Single)
  46. Row 3 / Column 6 → 6 (Naked Single)
  47. Row 4 / Column 2 → 8 (Naked Single)
  48. Row 6 / Column 2 → 8 (Naked Single)
  49. Row 4 / Column 8 → 5 (Full House)
  50. Row 6 / Column 8 → 5 (Full House)
  51. Row 4 / Column 3 → 5 (Naked Single)
  52. Row 4 / Column 4 → 6 (Hidden Single)
  53. Row 6 / Column 4 → 9 (Naked Single)
  54. Give Up: Don't know how to proceed!
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