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

This Sudoku Puzzle has 64 steps and it is solved using Naked Single, Full House, Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Triple, undefined, Bivalue Universal Grave + 1 techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 9 / Column 6 → 2 (Naked Single)
2. Row 7 / Column 8 → 7 (Naked Single)
3. Row 7 / Column 9 → 2 (Naked Single)
4. Row 8 / Column 7 → 6 (Naked Single)
5. Row 8 / Column 9 → 5 (Full House)
6. Row 1 / Column 7 → 4 (Naked Single)
7. Row 9 / Column 5 → 6 (Hidden Single)
8. Row 5 / Column 7 → 7 (Hidden Single)
9. Row 3 / Column 7 → 9 (Naked Single)
10. Row 6 / Column 7 → 2 (Full House)
11. Row 8 / Column 3 → 2 (Hidden Single)
12. Row 9 / Column 3 → 1 (Hidden Single)
13. Row 3 / Column 3 → 7 (Hidden Single)
14. Row 2 / Column 9 → 7 (Hidden Single)
15. Row 4 / Column 2 → 2 (Hidden Single)
16. Row 6 / Column 1 → 7 (Hidden Single)
17. Locked Candidates Type 1 (Pointing): 6 in b3 => r46c8<>6
18. Locked Candidates Type 1 (Pointing): 9 in b7 => r4c1<>9
19. Locked Candidates Type 2 (Claiming): 5 in c3 => r4c1,r56c2<>5
20. Naked Triple: 3,5,6 in r1c128 => r1c45<>3, r1c45<>5, r1c4<>6
21. Locked Candidates Type 1 (Pointing): 5 in b2 => r3c2<>5
22. XYZ-Wing: 3/5/6 in r1c12,r4c1 => r2c1<>3
23. XY-Chain: 8 8- r3c6 -3- r3c8 -6- r1c8 -3- r1c2 -5- r9c2 -8 => r3c2<>8
24. Row 9 / Column 2 → 8 (Hidden Single)
25. Row 9 / Column 1 → 5 (Full House)
26. Row 2 / Column 1 → 8 (Hidden Single)
27. Row 1 / Column 2 → 5 (Hidden Single)
28. Row 7 / Column 1 → 4 (Hidden Single)
29. Row 7 / Column 3 → 3 (Naked Single)
30. Row 8 / Column 1 → 9 (Full House)
31. Row 8 / Column 4 → 3 (Full House)
32. Locked Candidates Type 2 (Claiming): 3 in r2 => r3c56<>3
33. Row 3 / Column 6 → 8 (Naked Single)
34. Row 6 / Column 4 → 8 (Hidden Single)
35. Row 4 / Column 8 → 8 (Hidden Single)
36. Row 4 / Column 3 → 5 (Hidden Single)
37. XY-Wing: 4/6/9 in r5c2,r6c39 => r6c2<>9
38. Row 5 / Column 2 → 9 (Hidden Single)
39. Row 5 / Column 8 → 4 (Hidden Single)
40. Row 6 / Column 8 → 5 (Naked Single)
41. Bivalue Universal Grave + 1 => r2c5<>3, r2c5<>4
42. Row 2 / Column 5 → 9 (Naked Single)
43. Row 2 / Column 4 → 6 (Naked Single)
44. Row 2 / Column 6 → 3 (Naked Single)
45. Row 2 / Column 3 → 4 (Full House)
46. Row 4 / Column 6 → 9 (Full House)
47. Row 6 / Column 3 → 6 (Full House)
48. Row 6 / Column 5 → 3 (Naked Single)
49. Row 7 / Column 5 → 1 (Naked Single)
50. Row 7 / Column 4 → 9 (Full House)
51. Row 3 / Column 4 → 5 (Naked Single)
52. Row 3 / Column 2 → 3 (Naked Single)
53. Row 6 / Column 2 → 4 (Full House)
54. Row 4 / Column 1 → 3 (Full House)
55. Row 4 / Column 9 → 6 (Full House)
56. Row 6 / Column 9 → 9 (Full House)
57. Row 1 / Column 1 → 6 (Full House)
58. Row 1 / Column 5 → 2 (Naked Single)
59. Row 3 / Column 5 → 4 (Naked Single)
60. Row 3 / Column 8 → 6 (Full House)
61. Row 1 / Column 8 → 3 (Full House)
62. Row 1 / Column 4 → 1 (Full House)
63. Row 5 / Column 4 → 2 (Full House)
64. Row 5 / Column 5 → 5 (Full House)