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

This Sudoku Puzzle has 40 steps and it is solved using Locked Candidates Type 1 (Pointing), Naked Single, Hidden Single, Full House techniques.

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

Solution Steps:

  1. Locked Candidates Type 1 (Pointing): 9 in b8 => r456c4<>9
  2. Row 6 / Column 4 → 6 (Naked Single)
  3. Row 5 / Column 8 → 6 (Hidden Single)
  4. Row 1 / Column 8 → 2 (Naked Single)
  5. Row 3 / Column 8 → 5 (Naked Single)
  6. Row 7 / Column 8 → 7 (Full House)
  7. Row 3 / Column 7 → 3 (Naked Single)
  8. Row 3 / Column 3 → 6 (Full House)
  9. Row 1 / Column 7 → 9 (Naked Single)
  10. Row 1 / Column 9 → 6 (Full House)
  11. Row 5 / Column 7 → 5 (Naked Single)
  12. Row 4 / Column 7 → 4 (Naked Single)
  13. Row 7 / Column 7 → 2 (Full House)
  14. Row 5 / Column 3 → 3 (Naked Single)
  15. Row 6 / Column 9 → 9 (Naked Single)
  16. Row 4 / Column 9 → 7 (Full House)
  17. Row 1 / Column 3 → 7 (Naked Single)
  18. Row 7 / Column 3 → 5 (Full House)
  19. Row 1 / Column 1 → 3 (Full House)
  20. Row 5 / Column 2 → 9 (Naked Single)
  21. Row 6 / Column 5 → 5 (Naked Single)
  22. Row 6 / Column 1 → 4 (Full House)
  23. Row 4 / Column 1 → 5 (Full House)
  24. Row 4 / Column 4 → 3 (Naked Single)
  25. Row 4 / Column 5 → 9 (Full House)
  26. Row 8 / Column 5 → 3 (Full House)
  27. Row 7 / Column 6 → 1 (Naked Single)
  28. Row 8 / Column 1 → 7 (Naked Single)
  29. Row 8 / Column 9 → 5 (Full House)
  30. Row 5 / Column 6 → 7 (Naked Single)
  31. Row 5 / Column 4 → 1 (Full House)
  32. Row 9 / Column 6 → 5 (Full House)
  33. Row 7 / Column 2 → 3 (Naked Single)
  34. Row 9 / Column 2 → 1 (Full House)
  35. Row 7 / Column 4 → 9 (Naked Single)
  36. Row 9 / Column 4 → 7 (Full House)
  37. Row 9 / Column 1 → 9 (Naked Single)
  38. Row 9 / Column 9 → 3 (Full House)
  39. Row 7 / Column 9 → 4 (Full House)
  40. Row 7 / Column 1 → 6 (Full House)
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