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

This Sudoku Puzzle has 37 steps and it is solved using Locked Candidates Type 2 (Claiming), Naked Pair, Hidden Single, undefined, Swordfish, Naked Single, Full House techniques.

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

Solution Steps:

  1. Locked Candidates Type 2 (Claiming): 3 in c2 => r8c1,r9c3<>3
  2. Naked Pair: 5,8 in r8c1,r9c3 => r7c13<>5, r89c2<>8
  3. Row 7 / Column 7 → 5 (Hidden Single)
  4. X-Wing: 9 r15 c37 => r36c3<>9
  5. Swordfish: 8 r159 c237 => r6c3<>8
  6. W-Wing: 9/8 in r1c7,r5c3 connected by 8 in r9c37 => r1c3,r5c7<>9
  7. Row 1 / Column 7 → 9 (Hidden Single)
  8. Row 3 / Column 9 → 6 (Naked Single)
  9. Row 2 / Column 9 → 8 (Full House)
  10. Row 2 / Column 1 → 6 (Full House)
  11. Row 3 / Column 3 → 3 (Naked Single)
  12. Row 3 / Column 1 → 9 (Full House)
  13. Row 7 / Column 1 → 1 (Naked Single)
  14. Row 6 / Column 3 → 5 (Naked Single)
  15. Row 4 / Column 1 → 3 (Naked Single)
  16. Row 4 / Column 9 → 1 (Full House)
  17. Row 7 / Column 9 → 4 (Naked Single)
  18. Row 9 / Column 2 → 3 (Naked Single)
  19. Row 9 / Column 3 → 8 (Naked Single)
  20. Row 6 / Column 1 → 8 (Naked Single)
  21. Row 8 / Column 1 → 5 (Full House)
  22. Row 5 / Column 7 → 8 (Naked Single)
  23. Row 9 / Column 7 → 1 (Full House)
  24. Row 9 / Column 4 → 5 (Full House)
  25. Row 8 / Column 4 → 3 (Full House)
  26. Row 7 / Column 5 → 7 (Naked Single)
  27. Row 7 / Column 3 → 6 (Full House)
  28. Row 8 / Column 2 → 7 (Full House)
  29. Row 8 / Column 5 → 4 (Full House)
  30. Row 8 / Column 9 → 9 (Naked Single)
  31. Row 6 / Column 9 → 3 (Full House)
  32. Row 6 / Column 8 → 9 (Full House)
  33. Row 8 / Column 8 → 8 (Full House)
  34. Row 1 / Column 3 → 7 (Naked Single)
  35. Row 5 / Column 3 → 9 (Full House)
  36. Row 5 / Column 2 → 1 (Full House)
  37. Row 1 / Column 2 → 8 (Full House)
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