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

This Sudoku Puzzle has 45 steps and it is solved using Locked Candidates Type 2 (Claiming), Naked Triple, Skyscraper, Naked Single, Full House, Empty Rectangle, Naked Pair, Turbot Fish, undefined, Hidden Single techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Locked Candidates Type 2 (Claiming): 6 in c7 => r456c9,r6c8<>6
2. Naked Triple: 3,6,8 in r6c268 => r6c19<>3, r6c1<>6, r6c19<>8
3. Skyscraper: 5 in r7c9,r9c4 (connected by r1c49) => r7c5,r9c8<>5
4. Row 7 / Column 5 → 6 (Naked Single)
5. Row 7 / Column 9 → 5 (Full House)
6. Row 9 / Column 8 → 6 (Full House)
7. Skyscraper: 6 in r2c1,r6c2 (connected by r26c6) => r1c2,r45c1<>6
8. Empty Rectangle: 8 in b6 (r3c69) => r6c6<>8
9. Naked Pair: 3,6 in r4c4,r6c6 => r4c56,r5c56<>3, r45c6<>6
10. Turbot Fish: 8 r2c1 =8= r1c2 -8- r6c2 =8= r6c8 => r2c8<>8
11. W-Wing: 3/6 in r3c3,r6c6 connected by 6 in r2c16 => r3c6<>3
12. XYZ-Wing: 3/5/8 in r1c28,r2c8 => r1c9<>3
13. XY-Wing: 3/8/6 in r1c29,r3c3 => r3c9<>6
14. Row 1 / Column 9 → 6 (Hidden Single)
15. Row 4 / Column 4 → 6 (Hidden Single)
16. Row 4 / Column 7 → 4 (Naked Single)
17. Row 5 / Column 7 → 6 (Full House)
18. Row 6 / Column 6 → 3 (Naked Single)
19. Row 4 / Column 6 → 8 (Naked Single)
20. Row 6 / Column 8 → 8 (Naked Single)
21. Row 3 / Column 6 → 6 (Naked Single)
22. Row 4 / Column 5 → 1 (Naked Single)
23. Row 6 / Column 2 → 6 (Naked Single)
24. Row 2 / Column 6 → 5 (Naked Single)
25. Row 5 / Column 6 → 4 (Full House)
26. Row 5 / Column 5 → 5 (Full House)
27. Row 3 / Column 3 → 3 (Naked Single)
28. Row 3 / Column 9 → 8 (Full House)
29. Row 8 / Column 3 → 6 (Full House)
30. Row 8 / Column 1 → 3 (Full House)
31. Row 1 / Column 4 → 3 (Naked Single)
32. Row 2 / Column 5 → 8 (Full House)
33. Row 9 / Column 5 → 3 (Full House)
34. Row 9 / Column 4 → 5 (Full House)
35. Row 2 / Column 8 → 3 (Naked Single)
36. Row 1 / Column 8 → 5 (Full House)
37. Row 1 / Column 2 → 8 (Full House)
38. Row 2 / Column 1 → 6 (Full House)
39. Row 5 / Column 2 → 3 (Full House)
40. Row 4 / Column 1 → 9 (Naked Single)
41. Row 4 / Column 9 → 3 (Full House)
42. Row 5 / Column 9 → 1 (Naked Single)
43. Row 5 / Column 1 → 8 (Full House)
44. Row 6 / Column 1 → 1 (Full House)
45. Row 6 / Column 9 → 9 (Full House)