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

This Sudoku Puzzle has 48 steps and it is solved using Naked Single, Full House, Hidden Single, Uniqueness Test 1, Avoidable Rectangle Type 1 techniques.

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

Solution Steps:

  1. Row 4 / Column 7 → 8 (Naked Single)
  2. Row 3 / Column 3 → 9 (Naked Single)
  3. Row 3 / Column 7 → 4 (Naked Single)
  4. Row 5 / Column 7 → 5 (Full House)
  5. Row 4 / Column 9 → 7 (Naked Single)
  6. Row 9 / Column 8 → 7 (Naked Single)
  7. Row 8 / Column 9 → 5 (Full House)
  8. Row 1 / Column 9 → 9 (Naked Single)
  9. Row 3 / Column 4 → 2 (Naked Single)
  10. Row 3 / Column 9 → 6 (Naked Single)
  11. Row 5 / Column 9 → 4 (Full House)
  12. Row 5 / Column 8 → 1 (Full House)
  13. Row 3 / Column 1 → 7 (Full House)
  14. Row 4 / Column 5 → 6 (Naked Single)
  15. Row 5 / Column 3 → 8 (Naked Single)
  16. Row 5 / Column 4 → 9 (Naked Single)
  17. Row 5 / Column 2 → 6 (Naked Single)
  18. Row 5 / Column 6 → 7 (Full House)
  19. Row 8 / Column 1 → 8 (Hidden Single)
  20. Row 2 / Column 6 → 9 (Hidden Single)
  21. Row 7 / Column 5 → 7 (Hidden Single)
  22. Row 6 / Column 2 → 9 (Hidden Single)
  23. Row 8 / Column 2 → 7 (Hidden Single)
  24. Row 9 / Column 5 → 3 (Hidden Single)
  25. Row 9 / Column 3 → 5 (Naked Single)
  26. Row 9 / Column 2 → 4 (Full House)
  27. Uniqueness Test 1: 1/3 in r1c23,r7c23 => r1c2<>1, r1c2<>3
  28. Row 1 / Column 3 → 3 (Hidden Single)
  29. Row 7 / Column 3 → 1 (Full House)
  30. Row 7 / Column 2 → 3 (Full House)
  31. Row 1 / Column 1 → 1 (Hidden Single)
  32. Row 4 / Column 1 → 2 (Naked Single)
  33. Row 2 / Column 1 → 4 (Full House)
  34. Row 4 / Column 2 → 1 (Full House)
  35. Uniqueness Test 1: 1/4 in r6c46,r8c46 => r6c4<>1, r6c4<>4
  36. Row 6 / Column 4 → 8 (Naked Single)
  37. Row 1 / Column 4 → 4 (Naked Single)
  38. Row 8 / Column 4 → 1 (Full House)
  39. Row 8 / Column 6 → 4 (Full House)
  40. Row 6 / Column 6 → 1 (Full House)
  41. Row 6 / Column 5 → 4 (Full House)
  42. Avoidable Rectangle Type 1: 2/1 in r1c12,r4c12 => r1c2<>2
  43. Row 1 / Column 2 → 5 (Naked Single)
  44. Row 2 / Column 2 → 2 (Full House)
  45. Row 1 / Column 5 → 8 (Naked Single)
  46. Row 1 / Column 8 → 2 (Full House)
  47. Row 2 / Column 8 → 8 (Full House)
  48. Row 2 / Column 5 → 5 (Full House)
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