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

This Sudoku Puzzle has 25 steps and it is solved using Naked Single, Full House, Bivalue Universal Grave + 1 techniques.

Naked Single Explanation
Full House Explanation
Try To Solve This Puzzle

Solution Steps:

  1. Row 1 / Column 8 → 4 (Naked Single)
  2. Row 1 / Column 7 → 9 (Full House)
  3. Row 8 / Column 8 → 1 (Full House)
  4. Row 3 / Column 7 → 1 (Full House)
  5. Row 8 / Column 9 → 4 (Full House)
  6. Row 4 / Column 7 → 4 (Full House)
  7. Row 6 / Column 9 → 1 (Full House)
  8. Row 8 / Column 4 → 9 (Full House)
  9. Row 4 / Column 1 → 9 (Naked Single)
  10. Row 4 / Column 4 → 1 (Full House)
  11. Row 6 / Column 1 → 4 (Full House)
  12. Row 5 / Column 4 → 4 (Full House)
  13. Row 5 / Column 2 → 1 (Full House)
  14. Row 6 / Column 6 → 9 (Full House)
  15. Row 3 / Column 6 → 4 (Naked Single)
  16. Row 2 / Column 6 → 1 (Full House)
  17. Row 3 / Column 5 → 9 (Full House)
  18. Bivalue Universal Grave + 1 => r7c3<>1, r7c3<>9
  19. Row 7 / Column 3 → 4 (Naked Single)
  20. Row 2 / Column 3 → 9 (Naked Single)
  21. Row 9 / Column 3 → 1 (Full House)
  22. Row 7 / Column 2 → 9 (Full House)
  23. Row 7 / Column 5 → 1 (Full House)
  24. Row 2 / Column 2 → 4 (Full House)
  25. Row 9 / Column 5 → 4 (Full House)
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