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

This Sudoku Puzzle has 42 steps and it is solved using Naked Single, Full House, Hidden Single, Locked Candidates Type 1 (Pointing) techniques.

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

Solution Steps:

  1. Row 7 / Column 6 → 7 (Naked Single)
  2. Row 1 / Column 6 → 5 (Naked Single)
  3. Row 5 / Column 6 → 6 (Naked Single)
  4. Row 3 / Column 6 → 8 (Naked Single)
  5. Row 8 / Column 6 → 9 (Full House)
  6. Row 5 / Column 1 → 5 (Naked Single)
  7. Row 4 / Column 1 → 9 (Naked Single)
  8. Row 6 / Column 1 → 6 (Naked Single)
  9. Row 3 / Column 9 → 2 (Hidden Single)
  10. Row 3 / Column 4 → 6 (Naked Single)
  11. Row 3 / Column 3 → 5 (Full House)
  12. Row 2 / Column 3 → 6 (Naked Single)
  13. Row 6 / Column 5 → 9 (Hidden Single)
  14. Locked Candidates Type 1 (Pointing): 3 in b9 => r5c8<>3
  15. Row 5 / Column 8 → 7 (Naked Single)
  16. Row 5 / Column 4 → 3 (Full House)
  17. Row 1 / Column 8 → 1 (Naked Single)
  18. Row 7 / Column 4 → 2 (Naked Single)
  19. Row 7 / Column 8 → 3 (Full House)
  20. Row 1 / Column 1 → 4 (Naked Single)
  21. Row 2 / Column 1 → 1 (Full House)
  22. Row 1 / Column 4 → 7 (Naked Single)
  23. Row 1 / Column 5 → 2 (Full House)
  24. Row 2 / Column 5 → 4 (Full House)
  25. Row 6 / Column 4 → 5 (Naked Single)
  26. Row 4 / Column 5 → 7 (Full House)
  27. Row 8 / Column 5 → 5 (Naked Single)
  28. Row 9 / Column 5 → 3 (Full House)
  29. Row 6 / Column 7 → 8 (Naked Single)
  30. Row 9 / Column 4 → 8 (Naked Single)
  31. Row 8 / Column 4 → 4 (Full House)
  32. Row 4 / Column 3 → 3 (Naked Single)
  33. Row 4 / Column 9 → 5 (Full House)
  34. Row 6 / Column 9 → 3 (Full House)
  35. Row 6 / Column 3 → 7 (Full House)
  36. Row 8 / Column 8 → 8 (Naked Single)
  37. Row 8 / Column 9 → 7 (Full House)
  38. Row 2 / Column 9 → 8 (Full House)
  39. Row 9 / Column 7 → 5 (Naked Single)
  40. Row 2 / Column 7 → 7 (Full House)
  41. Row 2 / Column 8 → 5 (Full House)
  42. Row 9 / Column 8 → 2 (Full House)
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