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

This Sudoku Puzzle has 46 steps and it is solved using Naked Single, Locked Candidates Type 1 (Pointing), Naked Pair, Turbot Fish, Empty Rectangle, Full House, Skyscraper, Hidden Single techniques.

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

Solution Steps:

  1. Row 4 / Column 8 → 8 (Naked Single)
  2. Locked Candidates Type 1 (Pointing): 1 in b3 => r6c7<>1
  3. Locked Candidates Type 1 (Pointing): 5 in b3 => r6c7<>5
  4. Naked Pair: 1,5 in r3c27 => r3c6<>5
  5. Turbot Fish: 5 r2c6 =5= r1c4 -5- r4c4 =5= r4c2 => r2c2<>5
  6. Empty Rectangle: 5 in b1 (r4c24) => r1c4<>5
  7. Row 1 / Column 4 → 3 (Naked Single)
  8. Row 2 / Column 5 → 4 (Naked Single)
  9. Row 2 / Column 6 → 5 (Naked Single)
  10. Row 2 / Column 7 → 1 (Naked Single)
  11. Row 2 / Column 2 → 3 (Full House)
  12. Row 3 / Column 7 → 5 (Full House)
  13. Row 3 / Column 2 → 1 (Naked Single)
  14. Skyscraper: 4 in r4c4,r9c6 (connected by r49c2) => r56c6,r8c4<>4
  15. Row 8 / Column 4 → 8 (Naked Single)
  16. Row 9 / Column 6 → 4 (Hidden Single)
  17. Row 9 / Column 2 → 7 (Naked Single)
  18. Row 1 / Column 2 → 5 (Naked Single)
  19. Row 1 / Column 1 → 7 (Full House)
  20. Row 4 / Column 2 → 4 (Full House)
  21. Row 4 / Column 4 → 5 (Full House)
  22. Row 8 / Column 3 → 3 (Naked Single)
  23. Row 9 / Column 5 → 3 (Naked Single)
  24. Row 9 / Column 3 → 8 (Full House)
  25. Row 5 / Column 3 → 7 (Full House)
  26. Row 7 / Column 1 → 4 (Full House)
  27. Row 7 / Column 5 → 7 (Full House)
  28. Row 8 / Column 7 → 4 (Naked Single)
  29. Row 6 / Column 7 → 3 (Full House)
  30. Row 5 / Column 6 → 6 (Naked Single)
  31. Row 7 / Column 9 → 1 (Naked Single)
  32. Row 7 / Column 8 → 3 (Full House)
  33. Row 8 / Column 9 → 6 (Naked Single)
  34. Row 8 / Column 8 → 7 (Full House)
  35. Row 6 / Column 1 → 5 (Naked Single)
  36. Row 5 / Column 1 → 3 (Full House)
  37. Row 3 / Column 6 → 8 (Naked Single)
  38. Row 3 / Column 5 → 6 (Full House)
  39. Row 6 / Column 5 → 8 (Full House)
  40. Row 6 / Column 6 → 7 (Full House)
  41. Row 5 / Column 8 → 1 (Naked Single)
  42. Row 6 / Column 8 → 6 (Full House)
  43. Row 6 / Column 9 → 4 (Naked Single)
  44. Row 5 / Column 9 → 5 (Full House)
  45. Row 5 / Column 4 → 4 (Full House)
  46. Row 6 / Column 4 → 1 (Full House)
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