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

This Sudoku Puzzle has 24 steps and it is solved using Locked Candidates Type 2 (Claiming), Skyscraper, Naked Single, Full House techniques.

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

Solution Steps:

  1. Locked Candidates Type 2 (Claiming): 1 in c3 => r4c1<>1
  2. Skyscraper: 1 in r3c2,r9c1 (connected by r39c9) => r1c1,r7c2<>1
  3. Row 7 / Column 2 → 3 (Naked Single)
  4. Row 7 / Column 4 → 1 (Full House)
  5. Row 9 / Column 1 → 1 (Full House)
  6. Row 8 / Column 4 → 3 (Full House)
  7. Row 9 / Column 9 → 3 (Full House)
  8. Row 2 / Column 9 → 2 (Naked Single)
  9. Row 2 / Column 3 → 3 (Full House)
  10. Row 3 / Column 9 → 1 (Full House)
  11. Row 1 / Column 1 → 2 (Naked Single)
  12. Row 4 / Column 1 → 3 (Full House)
  13. Row 6 / Column 3 → 1 (Naked Single)
  14. Row 4 / Column 3 → 2 (Full House)
  15. Row 4 / Column 8 → 1 (Full House)
  16. Row 6 / Column 7 → 3 (Full House)
  17. Row 3 / Column 2 → 8 (Naked Single)
  18. Row 1 / Column 2 → 1 (Full House)
  19. Row 3 / Column 5 → 2 (Full House)
  20. Row 1 / Column 5 → 8 (Full House)
  21. Row 8 / Column 8 → 4 (Naked Single)
  22. Row 1 / Column 8 → 3 (Full House)
  23. Row 1 / Column 7 → 4 (Full House)
  24. Row 8 / Column 7 → 1 (Full House)
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