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

This Sudoku Puzzle has 69 steps and it is solved using Naked Single, Hidden Single, Full House, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), undefined, Uniqueness Test 3, Finned Swordfish, Bivalue Universal Grave + 1 techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 9 / Column 3 → 5 (Naked Single)
2. Row 5 / Column 3 → 2 (Hidden Single)
3. Row 8 / Column 8 → 2 (Hidden Single)
4. Row 2 / Column 3 → 8 (Hidden Single)
5. Row 1 / Column 7 → 8 (Hidden Single)
6. Row 3 / Column 1 → 5 (Hidden Single)
7. Row 4 / Column 2 → 7 (Hidden Single)
8. Row 8 / Column 2 → 6 (Hidden Single)
9. Row 7 / Column 3 → 3 (Naked Single)
10. Row 3 / Column 3 → 6 (Naked Single)
11. Row 1 / Column 3 → 7 (Full House)
12. Row 2 / Column 9 → 5 (Hidden Single)
13. Row 2 / Column 8 → 7 (Hidden Single)
14. Row 5 / Column 4 → 7 (Hidden Single)
15. Row 2 / Column 2 → 9 (Hidden Single)
16. Locked Candidates Type 1 (Pointing): 1 in b3 => r3c5<>1
17. Locked Candidates Type 1 (Pointing): 6 in b3 => r1c5<>6
18. Locked Candidates Type 1 (Pointing): 2 in b6 => r3c7<>2
19. Locked Candidates Type 2 (Claiming): 3 in r2 => r1c56,r3c5<>3
20. Locked Candidates Type 2 (Claiming): 1 in r8 => r7c56,r9c5<>1
21. Locked Candidates Type 2 (Claiming): 9 in r8 => r7c56,r9c5<>9
22. Locked Candidates Type 2 (Claiming): 4 in c4 => r4c56,r5c56,r6c56<>4
23. 2-String Kite: 3 in r1c8,r6c2 (connected by r1c1,r3c2) => r6c8<>3
24. Uniqueness Test 3: 1/9 in r7c19,r9c19 => r7c7<>6
25. Locked Candidates Type 2 (Claiming): 6 in c7 => r46c8,r5c9<>6
26. Finned Swordfish: 4 r159 c159 fr1c6 => r3c5<>4
27. Row 3 / Column 5 → 2 (Naked Single)
28. Row 3 / Column 9 → 1 (Naked Single)
29. Row 3 / Column 7 → 3 (Naked Single)
30. Row 3 / Column 2 → 4 (Full House)
31. Row 1 / Column 1 → 3 (Full House)
32. Row 6 / Column 2 → 3 (Full House)
33. Row 1 / Column 8 → 6 (Naked Single)
34. Row 1 / Column 9 → 2 (Full House)
35. Row 7 / Column 8 → 4 (Naked Single)
36. Row 6 / Column 8 → 5 (Naked Single)
37. Row 4 / Column 8 → 3 (Full House)
38. Row 7 / Column 6 → 5 (Naked Single)
39. Row 9 / Column 9 → 9 (Naked Single)
40. Row 7 / Column 5 → 7 (Naked Single)
41. Row 5 / Column 9 → 4 (Naked Single)
42. Row 7 / Column 9 → 6 (Full House)
43. Row 9 / Column 1 → 1 (Naked Single)
44. Row 7 / Column 1 → 9 (Full House)
45. Row 7 / Column 7 → 1 (Full House)
46. Row 9 / Column 7 → 7 (Full House)
47. Row 9 / Column 5 → 4 (Full House)
48. Row 1 / Column 5 → 9 (Naked Single)
49. Row 1 / Column 6 → 4 (Full House)
50. Row 6 / Column 5 → 6 (Naked Single)
51. Row 5 / Column 5 → 3 (Naked Single)
52. Row 2 / Column 5 → 1 (Naked Single)
53. Row 4 / Column 5 → 5 (Full House)
54. Row 2 / Column 4 → 6 (Naked Single)
55. Row 2 / Column 6 → 3 (Full House)
56. Bivalue Universal Grave + 1 => r6c6<>2, r6c6<>8
57. Row 6 / Column 6 → 9 (Naked Single)
58. Row 5 / Column 6 → 8 (Naked Single)
59. Row 6 / Column 4 → 4 (Naked Single)
60. Row 6 / Column 7 → 2 (Naked Single)
61. Row 6 / Column 1 → 8 (Full House)
62. Row 8 / Column 6 → 1 (Naked Single)
63. Row 4 / Column 6 → 2 (Full House)
64. Row 4 / Column 4 → 1 (Full House)
65. Row 8 / Column 4 → 9 (Full House)
66. Row 5 / Column 1 → 6 (Naked Single)
67. Row 4 / Column 1 → 4 (Full House)
68. Row 4 / Column 7 → 6 (Full House)
69. Row 5 / Column 7 → 9 (Full House)