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

This Sudoku Puzzle has 49 steps and it is solved using Locked Candidates Type 1 (Pointing), Empty Rectangle, undefined, Naked Pair, Hidden Single, Naked Single, Skyscraper, Full House techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Locked Candidates Type 1 (Pointing): 5 in b6 => r7c8<>5
2. Empty Rectangle: 8 in b4 (r14c6) => r1c3<>8
3. XY-Chain: 4 4- r2c1 -8- r2c7 -9- r9c7 -5- r9c1 -4 => r147c1<>4
4. 2-String Kite: 4 in r2c1,r7c5 (connected by r7c3,r9c1) => r2c5<>4
5. Locked Candidates Type 1 (Pointing): 4 in b2 => r1c23<>4
6. 2-String Kite: 4 in r4c3,r9c6 (connected by r7c3,r9c1) => r4c6<>4
7. Naked Pair: 8,9 in r4c6,r5c4 => r46c5,r6c4<>9, r6c4<>8
8. Row 6 / Column 8 → 8 (Hidden Single)
9. XY-Wing: 4/9/6 in r47c5,r7c8 => r4c8<>6
10. XY-Chain: 9 9- r2c7 -8- r2c1 -4- r9c1 -5- r9c7 -9- r9c6 -4- r7c5 -9 => r2c5,r7c7<>9
11. Row 2 / Column 5 → 1 (Naked Single)
12. Skyscraper: 9 in r2c7,r6c9 (connected by r26c2) => r13c9<>9
13. Row 6 / Column 9 → 9 (Hidden Single)
14. Row 4 / Column 8 → 5 (Naked Single)
15. Row 5 / Column 8 → 6 (Full House)
16. Row 7 / Column 8 → 9 (Full House)
17. Row 7 / Column 5 → 4 (Naked Single)
18. Row 9 / Column 6 → 9 (Full House)
19. Row 9 / Column 7 → 5 (Naked Single)
20. Row 7 / Column 7 → 6 (Full House)
21. Row 9 / Column 1 → 4 (Full House)
22. Row 4 / Column 5 → 6 (Naked Single)
23. Row 4 / Column 6 → 8 (Naked Single)
24. Row 1 / Column 6 → 4 (Full House)
25. Row 2 / Column 1 → 8 (Naked Single)
26. Row 6 / Column 5 → 7 (Naked Single)
27. Row 3 / Column 5 → 9 (Full House)
28. Row 4 / Column 1 → 3 (Naked Single)
29. Row 5 / Column 4 → 9 (Naked Single)
30. Row 6 / Column 4 → 4 (Full House)
31. Row 6 / Column 2 → 6 (Full House)
32. Row 2 / Column 7 → 9 (Naked Single)
33. Row 3 / Column 7 → 8 (Full House)
34. Row 2 / Column 2 → 4 (Full House)
35. Row 1 / Column 4 → 8 (Naked Single)
36. Row 3 / Column 4 → 7 (Full House)
37. Row 3 / Column 3 → 5 (Naked Single)
38. Row 1 / Column 1 → 6 (Naked Single)
39. Row 7 / Column 1 → 5 (Full House)
40. Row 7 / Column 3 → 3 (Full House)
41. Row 5 / Column 2 → 5 (Naked Single)
42. Row 5 / Column 3 → 8 (Full House)
43. Row 4 / Column 2 → 9 (Naked Single)
44. Row 4 / Column 3 → 4 (Full House)
45. Row 1 / Column 3 → 9 (Full House)
46. Row 3 / Column 2 → 1 (Naked Single)
47. Row 1 / Column 2 → 3 (Full House)
48. Row 1 / Column 9 → 1 (Full House)
49. Row 3 / Column 9 → 6 (Full House)
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