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

This Sudoku Puzzle has 43 steps and it is solved using Naked Single, Locked Pair, Full House techniques.

Naked Single Explanation
Full House Explanation
Try To Solve This Puzzle

Solution Steps:

  1. Row 6 / Column 4 → 4 (Naked Single)
  2. Locked Pair: 4,8 in r23c2 => r1c12,r45c2<>4, r456c2<>8
  3. Row 1 / Column 2 → 7 (Naked Single)
  4. Row 5 / Column 2 → 3 (Naked Single)
  5. Row 5 / Column 7 → 2 (Naked Single)
  6. Row 6 / Column 9 → 8 (Naked Single)
  7. Row 6 / Column 1 → 6 (Naked Single)
  8. Row 6 / Column 6 → 7 (Naked Single)
  9. Row 1 / Column 1 → 1 (Naked Single)
  10. Row 5 / Column 5 → 8 (Naked Single)
  11. Row 4 / Column 5 → 3 (Full House)
  12. Row 6 / Column 3 → 2 (Naked Single)
  13. Row 9 / Column 6 → 1 (Naked Single)
  14. Row 1 / Column 3 → 6 (Naked Single)
  15. Row 5 / Column 1 → 4 (Naked Single)
  16. Row 4 / Column 1 → 8 (Full House)
  17. Row 7 / Column 5 → 4 (Naked Single)
  18. Row 7 / Column 6 → 8 (Full House)
  19. Row 3 / Column 6 → 4 (Full House)
  20. Row 9 / Column 4 → 6 (Naked Single)
  21. Row 3 / Column 4 → 1 (Full House)
  22. Row 9 / Column 5 → 7 (Full House)
  23. Row 5 / Column 9 → 1 (Naked Single)
  24. Row 2 / Column 5 → 5 (Naked Single)
  25. Row 3 / Column 2 → 8 (Naked Single)
  26. Row 2 / Column 2 → 4 (Full House)
  27. Row 2 / Column 8 → 8 (Full House)
  28. Row 4 / Column 9 → 4 (Naked Single)
  29. Row 1 / Column 9 → 2 (Full House)
  30. Row 5 / Column 3 → 7 (Naked Single)
  31. Row 4 / Column 3 → 1 (Full House)
  32. Row 5 / Column 8 → 6 (Full House)
  33. Row 1 / Column 5 → 9 (Naked Single)
  34. Row 3 / Column 5 → 6 (Full House)
  35. Row 3 / Column 8 → 9 (Full House)
  36. Row 1 / Column 7 → 5 (Naked Single)
  37. Row 1 / Column 8 → 4 (Full House)
  38. Row 6 / Column 8 → 5 (Naked Single)
  39. Row 4 / Column 8 → 7 (Full House)
  40. Row 4 / Column 7 → 9 (Naked Single)
  41. Row 4 / Column 2 → 5 (Full House)
  42. Row 6 / Column 2 → 9 (Full House)
  43. Row 6 / Column 7 → 3 (Full House)
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