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

This Sudoku Puzzle has 66 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Single, Full House, Uniqueness Test 1, Hidden Rectangle, Finned Swordfish techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 6 / Column 8 → 4 (Hidden Single)
2. Row 9 / Column 3 → 1 (Hidden Single)
3. Row 7 / Column 7 → 2 (Hidden Single)
4. Row 2 / Column 8 → 2 (Hidden Single)
5. Row 4 / Column 8 → 1 (Hidden Single)
6. Locked Candidates Type 1 (Pointing): 2 in b1 => r56c3<>2
7. Locked Candidates Type 1 (Pointing): 6 in b1 => r1c79<>6
8. Locked Candidates Type 1 (Pointing): 7 in b3 => r89c7<>7
9. Locked Candidates Type 1 (Pointing): 6 in b6 => r5c1356<>6
10. Locked Candidates Type 1 (Pointing): 9 in b6 => r5c12356<>9
11. Locked Candidates Type 2 (Claiming): 6 in c8 => r89c7,r9c9<>6
12. Row 8 / Column 7 → 8 (Naked Single)
13. Row 9 / Column 7 → 4 (Naked Single)
14. Row 1 / Column 9 → 8 (Hidden Single)
15. Row 9 / Column 4 → 8 (Hidden Single)
16. Row 7 / Column 1 → 4 (Hidden Single)
17. Row 3 / Column 1 → 9 (Naked Single)
18. Row 3 / Column 3 → 2 (Naked Single)
19. Row 3 / Column 9 → 4 (Naked Single)
20. Row 2 / Column 2 → 4 (Hidden Single)
21. Row 1 / Column 6 → 4 (Hidden Single)
22. Row 7 / Column 3 → 8 (Hidden Single)
23. Row 4 / Column 1 → 8 (Hidden Single)
24. Row 6 / Column 6 → 8 (Hidden Single)
25. Row 1 / Column 1 → 6 (Hidden Single)
26. Row 1 / Column 3 → 3 (Full House)
27. Row 5 / Column 3 → 5 (Naked Single)
28. Row 8 / Column 3 → 9 (Naked Single)
29. Row 6 / Column 3 → 6 (Full House)
30. Row 9 / Column 5 → 9 (Hidden Single)
31. Row 9 / Column 8 → 6 (Hidden Single)
32. Row 8 / Column 8 → 7 (Full House)
33. Row 4 / Column 5 → 6 (Hidden Single)
34. Row 8 / Column 6 → 6 (Hidden Single)
35. Uniqueness Test 1: 6/9 in r2c79,r5c79 => r2c7<>6, r2c7<>9
36. Row 2 / Column 7 → 1 (Naked Single)
37. Row 3 / Column 7 → 7 (Naked Single)
38. Row 1 / Column 7 → 9 (Naked Single)
39. Row 2 / Column 9 → 6 (Full House)
40. Row 5 / Column 7 → 6 (Full House)
41. Row 5 / Column 9 → 9 (Full House)
42. Hidden Rectangle: 2/3 in r5c25,r6c25 => r5c2<>3
43. Finned Swordfish: 3 r268 c246 fr6c5 => r5c6<>3
44. Row 5 / Column 6 → 1 (Naked Single)
45. Row 3 / Column 6 → 5 (Naked Single)
46. Row 3 / Column 5 → 1 (Full House)
47. Row 4 / Column 6 → 9 (Naked Single)
48. Row 2 / Column 6 → 3 (Full House)
49. Row 2 / Column 4 → 9 (Full House)
50. Row 4 / Column 2 → 7 (Naked Single)
51. Row 4 / Column 4 → 5 (Full House)
52. Row 5 / Column 1 → 3 (Naked Single)
53. Row 9 / Column 1 → 7 (Full House)
54. Row 5 / Column 2 → 2 (Naked Single)
55. Row 5 / Column 5 → 7 (Full House)
56. Row 6 / Column 2 → 9 (Full House)
57. Row 8 / Column 4 → 3 (Naked Single)
58. Row 7 / Column 5 → 5 (Full House)
59. Row 8 / Column 2 → 5 (Full House)
60. Row 7 / Column 9 → 3 (Full House)
61. Row 9 / Column 2 → 3 (Full House)
62. Row 9 / Column 9 → 5 (Full House)
63. Row 1 / Column 5 → 2 (Naked Single)
64. Row 1 / Column 4 → 7 (Full House)
65. Row 6 / Column 4 → 2 (Full House)
66. Row 6 / Column 5 → 3 (Full House)