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

This Sudoku Puzzle has 31 steps and it is solved using Locked Candidates Type 1 (Pointing), Hidden Single, Naked 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): 2 in b5 => r5c9<>2
  2. Row 4 / Column 9 → 2 (Hidden Single)
  3. Locked Candidates Type 1 (Pointing): 1 in b6 => r8c9<>1
  4. Row 8 / Column 8 → 1 (Hidden Single)
  5. Row 2 / Column 8 → 2 (Naked Single)
  6. Row 7 / Column 8 → 9 (Naked Single)
  7. Row 1 / Column 8 → 3 (Full House)
  8. Row 7 / Column 5 → 2 (Full House)
  9. Row 8 / Column 9 → 3 (Naked Single)
  10. Row 9 / Column 7 → 2 (Full House)
  11. Row 9 / Column 6 → 6 (Naked Single)
  12. Row 8 / Column 6 → 9 (Naked Single)
  13. Row 9 / Column 2 → 4 (Naked Single)
  14. Row 8 / Column 2 → 6 (Full House)
  15. Row 8 / Column 5 → 4 (Full House)
  16. Row 9 / Column 4 → 3 (Full House)
  17. Row 1 / Column 6 → 1 (Naked Single)
  18. Row 1 / Column 7 → 9 (Full House)
  19. Row 5 / Column 6 → 2 (Full House)
  20. Row 3 / Column 5 → 9 (Naked Single)
  21. Row 2 / Column 4 → 4 (Full House)
  22. Row 3 / Column 7 → 4 (Full House)
  23. Row 5 / Column 5 → 3 (Full House)
  24. Row 2 / Column 7 → 1 (Full House)
  25. Row 4 / Column 7 → 3 (Full House)
  26. Row 4 / Column 4 → 9 (Full House)
  27. Row 6 / Column 4 → 1 (Full House)
  28. Row 5 / Column 2 → 9 (Naked Single)
  29. Row 5 / Column 9 → 1 (Full House)
  30. Row 6 / Column 9 → 9 (Full House)
  31. Row 6 / Column 2 → 3 (Full House)
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