Solution for Evil Sudoku #1221713524895

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

This Sudoku Puzzle has 47 steps and it is solved using Hidden Single, Locked Pair, Naked Single, Full House, Give Up techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 7 / Column 1 → 4 (Hidden Single)
  2. Locked Pair: 6,9 in r46c4 => r2379c4,r46c6,r5c5<>6, r2379c4,r46c6,r5c5<>9
  3. Row 7 / Column 4 → 2 (Naked Single)
  4. Row 5 / Column 5 → 3 (Naked Single)
  5. Row 6 / Column 6 → 4 (Naked Single)
  6. Row 4 / Column 6 → 4 (Naked Single)
  7. Row 8 / Column 8 → 2 (Hidden Single)
  8. Row 9 / Column 2 → 2 (Hidden Single)
  9. Row 5 / Column 7 → 4 (Hidden Single)
  10. Row 3 / Column 3 → 2 (Hidden Single)
  11. Row 8 / Column 6 → 7 (Hidden Single)
  12. Row 9 / Column 4 → 8 (Naked Single)
  13. Row 3 / Column 4 → 1 (Naked Single)
  14. Row 2 / Column 4 → 7 (Naked Single)
  15. Row 5 / Column 8 → 7 (Hidden Single)
  16. Row 9 / Column 9 → 7 (Hidden Single)
  17. Row 8 / Column 7 → 8 (Hidden Single)
  18. Row 9 / Column 1 → 5 (Hidden Single)
  19. Row 3 / Column 2 → 4 (Hidden Single)
  20. Row 1 / Column 3 → 7 (Hidden Single)
  21. Row 7 / Column 6 → 3 (Hidden Single)
  22. Row 9 / Column 7 → 3 (Hidden Single)
  23. Row 8 / Column 1 → 3 (Hidden Single)
  24. Row 1 / Column 9 → 4 (Hidden Single)
  25. Row 7 / Column 5 → 5 (Hidden Single)
  26. Row 9 / Column 5 → 6 (Hidden Single)
  27. Row 3 / Column 9 → 8 (Hidden Single)
  28. Row 3 / Column 5 → 9 (Naked Single)
  29. Row 1 / Column 5 → 8 (Full House)
  30. Row 3 / Column 1 → 6 (Naked Single)
  31. Row 1 / Column 1 → 9 (Full House)
  32. Row 3 / Column 6 → 5 (Full House)
  33. Row 5 / Column 1 → 9 (Full House)
  34. Row 1 / Column 6 → 6 (Full House)
  35. Row 1 / Column 8 → 5 (Full House)
  36. Row 5 / Column 2 → 6 (Naked Single)
  37. Row 5 / Column 3 → 6 (Naked Single)
  38. Row 8 / Column 2 → 9 (Full House)
  39. Row 8 / Column 3 → 9 (Full House)
  40. Row 5 / Column 9 → 6 (Naked Single)
  41. Row 6 / Column 7 → 5 (Hidden Single)
  42. Row 6 / Column 2 → 8 (Naked Single)
  43. Row 6 / Column 8 → 9 (Naked Single)
  44. Row 6 / Column 4 → 6 (Full House)
  45. Row 4 / Column 4 → 9 (Full House)
  46. Row 4 / Column 8 → 8 (Naked Single)
  47. Give Up: Don't know how to proceed!
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