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

This Sudoku Puzzle has 42 steps and it is solved using Locked Pair, Locked Candidates Type 1 (Pointing), Swordfish, Naked Pair, Skyscraper, Naked Single, Full House techniques.

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

Solution Steps:

  1. Locked Pair: 2,5 in r3c45 => r2c5,r3c8<>2
  2. Locked Candidates Type 1 (Pointing): 1 in b6 => r6c3<>1
  3. Locked Candidates Type 1 (Pointing): 4 in b9 => r12c7<>4
  4. Swordfish: 4 c247 r479 => r47c6,r7c5,r9c3<>4
  5. Naked Pair: 1,6 in r39c3 => r8c3<>6
  6. Skyscraper: 6 in r1c1,r9c3 (connected by r19c7) => r3c3,r7c1<>6
  7. Row 3 / Column 3 → 1 (Naked Single)
  8. Row 2 / Column 1 → 7 (Naked Single)
  9. Row 1 / Column 1 → 6 (Full House)
  10. Row 3 / Column 8 → 6 (Naked Single)
  11. Row 9 / Column 3 → 6 (Naked Single)
  12. Row 2 / Column 5 → 4 (Naked Single)
  13. Row 1 / Column 7 → 3 (Naked Single)
  14. Row 1 / Column 6 → 7 (Naked Single)
  15. Row 1 / Column 9 → 4 (Full House)
  16. Row 2 / Column 9 → 2 (Naked Single)
  17. Row 2 / Column 7 → 1 (Full House)
  18. Row 4 / Column 9 → 3 (Full House)
  19. Row 8 / Column 5 → 2 (Naked Single)
  20. Row 6 / Column 7 → 2 (Naked Single)
  21. Row 6 / Column 8 → 1 (Full House)
  22. Row 4 / Column 1 → 1 (Naked Single)
  23. Row 7 / Column 1 → 3 (Full House)
  24. Row 3 / Column 5 → 5 (Naked Single)
  25. Row 3 / Column 4 → 2 (Full House)
  26. Row 7 / Column 5 → 7 (Full House)
  27. Row 8 / Column 8 → 3 (Naked Single)
  28. Row 7 / Column 8 → 2 (Full House)
  29. Row 6 / Column 6 → 4 (Naked Single)
  30. Row 6 / Column 3 → 3 (Full House)
  31. Row 4 / Column 2 → 4 (Full House)
  32. Row 8 / Column 3 → 4 (Full House)
  33. Row 8 / Column 6 → 6 (Full House)
  34. Row 9 / Column 7 → 4 (Naked Single)
  35. Row 7 / Column 7 → 6 (Full House)
  36. Row 4 / Column 4 → 5 (Naked Single)
  37. Row 4 / Column 6 → 2 (Full House)
  38. Row 7 / Column 6 → 5 (Full House)
  39. Row 7 / Column 2 → 1 (Naked Single)
  40. Row 7 / Column 4 → 4 (Full House)
  41. Row 9 / Column 4 → 1 (Full House)
  42. Row 9 / Column 2 → 2 (Full House)
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