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

This Sudoku Puzzle has 50 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 3 / Column 8 → 5 (Naked Single)
  2. Row 2 / Column 7 → 4 (Full House)
  3. Row 2 / Column 6 → 1 (Naked Single)
  4. Row 5 / Column 8 → 6 (Naked Single)
  5. Row 8 / Column 7 → 6 (Naked Single)
  6. Row 2 / Column 1 → 8 (Naked Single)
  7. Row 6 / Column 6 → 9 (Naked Single)
  8. Row 2 / Column 5 → 7 (Naked Single)
  9. Row 3 / Column 6 → 2 (Naked Single)
  10. Row 4 / Column 6 → 6 (Full House)
  11. Row 6 / Column 7 → 8 (Naked Single)
  12. Row 4 / Column 7 → 9 (Naked Single)
  13. Row 5 / Column 7 → 2 (Full House)
  14. Row 6 / Column 2 → 4 (Naked Single)
  15. Row 4 / Column 3 → 1 (Naked Single)
  16. Row 4 / Column 2 → 8 (Naked Single)
  17. Row 5 / Column 1 → 9 (Full House)
  18. Row 6 / Column 8 → 7 (Naked Single)
  19. Row 6 / Column 9 → 1 (Full House)
  20. Row 4 / Column 4 → 7 (Naked Single)
  21. Row 4 / Column 8 → 4 (Full House)
  22. Row 5 / Column 9 → 5 (Full House)
  23. Row 8 / Column 8 → 3 (Full House)
  24. Row 1 / Column 1 → 3 (Naked Single)
  25. Row 3 / Column 1 → 1 (Naked Single)
  26. Row 8 / Column 1 → 4 (Naked Single)
  27. Row 9 / Column 1 → 7 (Full House)
  28. Row 1 / Column 3 → 9 (Naked Single)
  29. Row 8 / Column 4 → 2 (Naked Single)
  30. Row 8 / Column 5 → 5 (Full House)
  31. Row 9 / Column 9 → 4 (Naked Single)
  32. Row 7 / Column 9 → 7 (Full House)
  33. Row 1 / Column 2 → 2 (Naked Single)
  34. Row 1 / Column 4 → 4 (Full House)
  35. Row 9 / Column 3 → 3 (Hidden Single)
  36. Row 7 / Column 5 → 4 (Hidden Single)
  37. Uniqueness Test 1: 5/6 in r2c23,r7c23 => r7c2<>5, r7c2<>6
  38. Row 7 / Column 2 → 9 (Naked Single)
  39. Row 7 / Column 4 → 6 (Naked Single)
  40. Row 7 / Column 3 → 5 (Full House)
  41. Row 9 / Column 2 → 6 (Full House)
  42. Row 2 / Column 3 → 6 (Full House)
  43. Row 2 / Column 2 → 5 (Full House)
  44. Avoidable Rectangle Type 1: 9/6 in r7c24,r9c24 => r9c4<>9
  45. Row 9 / Column 4 → 1 (Naked Single)
  46. Row 9 / Column 5 → 9 (Full House)
  47. Row 5 / Column 4 → 8 (Naked Single)
  48. Row 3 / Column 4 → 9 (Full House)
  49. Row 3 / Column 5 → 8 (Full House)
  50. Row 5 / Column 5 → 1 (Full House)
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