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

This Sudoku Puzzle has 65 steps and it is solved using Naked Single, Hidden Single, Locked Pair, Locked Candidates Type 1 (Pointing), Naked Pair, Hidden Pair, undefined, Swordfish, Naked Triple, Full House techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 3 / Column 1 → 2 (Naked Single)
2. Row 3 / Column 4 → 8 (Hidden Single)
3. Row 9 / Column 6 → 2 (Hidden Single)
4. Row 7 / Column 6 → 9 (Hidden Single)
5. Row 2 / Column 5 → 2 (Hidden Single)
6. Row 1 / Column 7 → 2 (Hidden Single)
7. Locked Pair: 4,7 in r5c46 => r46c5,r5c237<>7, r46c5<>4
8. Row 5 / Column 2 → 2 (Naked Single)
9. Row 5 / Column 8 → 9 (Naked Single)
10. Row 8 / Column 5 → 4 (Hidden Single)
11. Row 6 / Column 8 → 2 (Hidden Single)
12. Row 4 / Column 3 → 9 (Hidden Single)
13. Locked Candidates Type 1 (Pointing): 5 in b5 => r37c5<>5
14. Locked Candidates Type 1 (Pointing): 6 in b5 => r37c5<>6
15. Locked Candidates Type 1 (Pointing): 1 in b8 => r2c4<>1
16. Naked Pair: 5,7 in r7c2,r9c3 => r8c3<>5
17. Naked Pair: 3,8 in r58c3 => r6c3<>3
18. Hidden Pair: 1,6 in r7c48 => r7c4<>3, r7c48<>5, r7c4<>7
19. X-Wing: 8 r58 c37 => r4c7<>8
20. Hidden Pair: 4,8 in r4c19 => r4c9<>5
21. Swordfish: 3 r258 c347 => r6c7<>3
22. Naked Triple: 1,5,7 in r4c78,r6c7 => r6c9<>5
23. Naked Triple: 1,5,7 in r469c7 => r28c7<>5
24. Locked Candidates Type 1 (Pointing): 5 in b3 => r3c26<>5
25. Row 7 / Column 2 → 5 (Hidden Single)
26. Row 7 / Column 9 → 8 (Naked Single)
27. Row 9 / Column 3 → 7 (Naked Single)
28. Row 4 / Column 9 → 4 (Naked Single)
29. Row 7 / Column 1 → 3 (Naked Single)
30. Row 8 / Column 3 → 8 (Full House)
31. Row 8 / Column 7 → 6 (Naked Single)
32. Row 4 / Column 1 → 8 (Naked Single)
33. Row 6 / Column 1 → 4 (Full House)
34. Row 6 / Column 9 → 3 (Naked Single)
35. Row 3 / Column 9 → 5 (Full House)
36. Row 7 / Column 5 → 7 (Naked Single)
37. Row 5 / Column 3 → 3 (Naked Single)
38. Row 2 / Column 7 → 3 (Naked Single)
39. Row 3 / Column 8 → 6 (Full House)
40. Row 7 / Column 8 → 1 (Naked Single)
41. Row 4 / Column 8 → 5 (Full House)
42. Row 7 / Column 4 → 6 (Full House)
43. Row 9 / Column 7 → 5 (Full House)
44. Row 9 / Column 4 → 1 (Full House)
45. Row 8 / Column 6 → 5 (Naked Single)
46. Row 8 / Column 4 → 3 (Full House)
47. Row 5 / Column 7 → 8 (Naked Single)
48. Row 3 / Column 5 → 3 (Naked Single)
49. Row 3 / Column 2 → 1 (Naked Single)
50. Row 3 / Column 6 → 7 (Full House)
51. Row 4 / Column 5 → 6 (Naked Single)
52. Row 6 / Column 5 → 5 (Full House)
53. Row 2 / Column 4 → 5 (Naked Single)
54. Row 5 / Column 6 → 4 (Naked Single)
55. Row 5 / Column 4 → 7 (Full House)
56. Row 1 / Column 4 → 4 (Full House)
57. Row 4 / Column 2 → 7 (Naked Single)
58. Row 4 / Column 7 → 1 (Full House)
59. Row 6 / Column 2 → 6 (Full House)
60. Row 6 / Column 7 → 7 (Full House)
61. Row 6 / Column 3 → 1 (Full House)
62. Row 2 / Column 3 → 6 (Naked Single)
63. Row 1 / Column 3 → 5 (Full House)
64. Row 1 / Column 6 → 6 (Full House)
65. Row 2 / Column 6 → 1 (Full House)