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

This Sudoku Puzzle has 59 steps and it is solved using Hidden Single, Naked Single, Full House, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Turbot Fish, undefined, Bivalue Universal Grave + 1 techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 6 / Column 3 → 8 (Hidden Single)
2. Row 5 / Column 7 → 7 (Hidden Single)
3. Row 5 / Column 6 → 1 (Hidden Single)
4. Row 1 / Column 7 → 8 (Hidden Single)
5. Row 3 / Column 5 → 2 (Hidden Single)
6. Row 8 / Column 4 → 2 (Hidden Single)
7. Row 7 / Column 8 → 1 (Hidden Single)
8. Row 7 / Column 6 → 4 (Hidden Single)
9. Row 7 / Column 5 → 9 (Naked Single)
10. Row 7 / Column 4 → 3 (Naked Single)
11. Row 9 / Column 4 → 7 (Full House)
12. Row 7 / Column 7 → 6 (Naked Single)
13. Row 7 / Column 1 → 5 (Full House)
14. Row 1 / Column 9 → 2 (Hidden Single)
15. Row 4 / Column 7 → 2 (Hidden Single)
16. Row 3 / Column 4 → 6 (Hidden Single)
17. Row 5 / Column 4 → 9 (Full House)
18. Row 8 / Column 8 → 5 (Hidden Single)
19. Row 2 / Column 9 → 6 (Hidden Single)
20. Row 3 / Column 9 → 1 (Hidden Single)
21. Locked Candidates Type 1 (Pointing): 3 in b4 => r1c1<>3
22. Locked Candidates Type 1 (Pointing): 4 in b6 => r9c9<>4
23. Locked Candidates Type 2 (Claiming): 6 in r5 => r46c1<>6
24. Turbot Fish: 9 r1c8 =9= r2c7 -9- r8c7 =9= r8c1 => r1c1<>9
25. Row 1 / Column 1 → 4 (Naked Single)
26. Row 5 / Column 1 → 6 (Naked Single)
27. Row 9 / Column 3 → 6 (Hidden Single)
28. Row 2 / Column 3 → 1 (Hidden Single)
29. Locked Candidates Type 1 (Pointing): 9 in b1 => r9c2<>9
30. W-Wing: 9/3 in r1c8,r3c6 connected by 3 in r2c67 => r1c6<>9
31. Row 1 / Column 8 → 9 (Hidden Single)
32. Row 2 / Column 7 → 3 (Full House)
33. Row 6 / Column 9 → 9 (Hidden Single)
34. Row 9 / Column 9 → 3 (Naked Single)
35. Bivalue Universal Grave + 1 => r4c2<>1, r4c2<>5
36. Row 4 / Column 2 → 4 (Naked Single)
37. Row 4 / Column 5 → 6 (Naked Single)
38. Row 6 / Column 5 → 4 (Full House)
39. Row 4 / Column 9 → 5 (Naked Single)
40. Row 5 / Column 9 → 4 (Full House)
41. Row 5 / Column 3 → 5 (Full House)
42. Row 6 / Column 2 → 7 (Naked Single)
43. Row 9 / Column 2 → 1 (Naked Single)
44. Row 4 / Column 8 → 3 (Naked Single)
45. Row 4 / Column 1 → 1 (Full House)
46. Row 6 / Column 1 → 3 (Full House)
47. Row 6 / Column 8 → 6 (Full House)
48. Row 1 / Column 3 → 3 (Naked Single)
49. Row 1 / Column 6 → 5 (Full House)
50. Row 3 / Column 2 → 9 (Naked Single)
51. Row 2 / Column 2 → 5 (Full House)
52. Row 3 / Column 3 → 7 (Full House)
53. Row 2 / Column 6 → 9 (Full House)
54. Row 3 / Column 6 → 3 (Full House)
55. Row 8 / Column 3 → 4 (Full House)
56. Row 9 / Column 1 → 9 (Naked Single)
57. Row 8 / Column 1 → 7 (Full House)
58. Row 8 / Column 7 → 9 (Full House)
59. Row 9 / Column 7 → 4 (Full House)