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.

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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