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

This Sudoku Puzzle has 39 steps and it is solved using Locked Candidates Type 1 (Pointing), Naked Pair, Hidden Single, Naked Single, Full House, Skyscraper, Locked Pair techniques.

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

Solution Steps:

  1. Locked Candidates Type 1 (Pointing): 2 in b7 => r13c3<>2
  2. Naked Pair: 8,9 in r8c57 => r8c38<>8, r8c8<>9
  3. Row 1 / Column 8 → 9 (Hidden Single)
  4. Row 9 / Column 8 → 8 (Hidden Single)
  5. Row 8 / Column 7 → 9 (Naked Single)
  6. Row 9 / Column 5 → 1 (Naked Single)
  7. Row 5 / Column 7 → 5 (Naked Single)
  8. Row 5 / Column 9 → 9 (Full House)
  9. Row 8 / Column 5 → 8 (Naked Single)
  10. Row 7 / Column 5 → 9 (Full House)
  11. Row 7 / Column 7 → 4 (Naked Single)
  12. Row 9 / Column 7 → 7 (Naked Single)
  13. Row 2 / Column 7 → 6 (Naked Single)
  14. Row 2 / Column 9 → 4 (Hidden Single)
  15. Row 1 / Column 2 → 6 (Hidden Single)
  16. Naked Pair: 3,5 in r7c29 => r7c3<>3, r7c3<>5
  17. Skyscraper: 3 in r2c8,r7c9 (connected by r27c2) => r3c9,r8c8<>3
  18. Row 8 / Column 8 → 2 (Naked Single)
  19. Row 2 / Column 8 → 3 (Full House)
  20. Row 8 / Column 3 → 3 (Full House)
  21. Row 2 / Column 2 → 5 (Full House)
  22. Row 7 / Column 2 → 5 (Full House)
  23. Row 2 / Column 5 → 2 (Full House)
  24. Row 9 / Column 9 → 5 (Naked Single)
  25. Row 7 / Column 9 → 3 (Full House)
  26. Row 9 / Column 3 → 2 (Full House)
  27. Row 3 / Column 5 → 7 (Naked Single)
  28. Row 1 / Column 5 → 5 (Full House)
  29. Row 3 / Column 9 → 2 (Naked Single)
  30. Row 1 / Column 9 → 7 (Full House)
  31. Row 1 / Column 1 → 2 (Hidden Single)
  32. Locked Pair: 1,8 in r13c3 => r3c1,r7c3<>1, r3c1,r7c3<>8
  33. Row 7 / Column 3 → 8 (Naked Single)
  34. Row 3 / Column 1 → 8 (Naked Single)
  35. Row 1 / Column 3 → 1 (Naked Single)
  36. Row 1 / Column 7 → 8 (Full House)
  37. Row 3 / Column 7 → 1 (Full House)
  38. Row 3 / Column 3 → 1 (Naked Single)
  39. Row 7 / Column 1 → 1 (Naked Single)
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