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

This Sudoku Puzzle has 71 steps and it is solved using Hidden Single, Naked Single, Full House, Locked Pair, Locked Candidates Type 1 (Pointing), Naked Triple, Locked Candidates Type 2 (Claiming), Uniqueness Test 3, Sue de Coq, Uniqueness Test 6, undefined techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 5 / Column 9 → 1 (Hidden Single)
2. Row 8 / Column 6 → 3 (Hidden Single)
3. Row 8 / Column 9 → 9 (Naked Single)
4. Row 7 / Column 9 → 5 (Naked Single)
5. Row 9 / Column 9 → 3 (Naked Single)
6. Row 2 / Column 9 → 2 (Naked Single)
7. Row 6 / Column 9 → 6 (Full House)
8. Row 1 / Column 8 → 9 (Hidden Single)
9. Row 3 / Column 6 → 2 (Hidden Single)
10. Row 3 / Column 4 → 7 (Hidden Single)
11. Row 8 / Column 1 → 7 (Hidden Single)
12. Locked Pair: 3,4 in r46c8 => r46c7,r79c8<>4, r46c7<>3
13. Row 4 / Column 8 → 3 (Hidden Single)
14. Row 6 / Column 8 → 4 (Naked Single)
15. Locked Candidates Type 1 (Pointing): 5 in b2 => r1c2<>5
16. Locked Candidates Type 1 (Pointing): 9 in b2 => r2c13<>9
17. Locked Candidates Type 1 (Pointing): 1 in b3 => r79c7<>1
18. Locked Candidates Type 1 (Pointing): 8 in b3 => r79c7<>8
19. Naked Triple: 2,3,5 in r6c127 => r6c35<>2, r6c45<>5
20. Row 6 / Column 3 → 7 (Naked Single)
21. Naked Triple: 4,8,9 in r689c4 => r124c4<>4, r12c4<>8, r2c4<>9
22. Locked Candidates Type 2 (Claiming): 4 in c4 => r7c6,r9c5<>4
23. Uniqueness Test 3: 8/9 in r6c45,r9c45 => r9c123<>4
24. Sue de Coq: r4c45 - {24567} (r4c7 - {25}, r45c6 - {467}) => r5c5<>4, r4c3<>2
25. Sue de Coq: r12c3 - {1468} (r4c3 - {46}, r3c123 - {1589}) => r1c2<>1, r1c2<>8, r5c3<>4, r59c3<>6
26. Row 5 / Column 3 → 2 (Naked Single)
27. Row 5 / Column 5 → 5 (Naked Single)
28. Row 4 / Column 4 → 6 (Naked Single)
29. Row 2 / Column 4 → 1 (Naked Single)
30. Row 4 / Column 3 → 4 (Naked Single)
31. Row 5 / Column 6 → 4 (Naked Single)
32. Row 5 / Column 2 → 6 (Full House)
33. Row 1 / Column 4 → 5 (Naked Single)
34. Row 4 / Column 6 → 7 (Naked Single)
35. Row 4 / Column 5 → 2 (Naked Single)
36. Row 4 / Column 7 → 5 (Full House)
37. Row 6 / Column 7 → 2 (Full House)
38. Row 9 / Column 2 → 2 (Hidden Single)
39. Row 9 / Column 1 → 6 (Hidden Single)
40. Row 9 / Column 5 → 7 (Hidden Single)
41. Row 9 / Column 7 → 4 (Naked Single)
42. Row 7 / Column 7 → 7 (Naked Single)
43. Row 8 / Column 4 → 4 (Hidden Single)
44. Row 8 / Column 2 → 8 (Full House)
45. Uniqueness Test 6: 6/8 in r1c36,r2c36 => r1c3,r2c6<>6
46. Row 1 / Column 6 → 6 (Hidden Single)
47. Row 2 / Column 3 → 6 (Hidden Single)
48. XY-Chain: 1 1- r3c2 -5- r6c2 -3- r1c2 -4- r1c5 -8- r6c5 -9- r6c4 -8- r9c4 -9- r9c3 -1 => r13c3,r7c2<>1
49. Row 1 / Column 3 → 8 (Naked Single)
50. Row 7 / Column 2 → 4 (Naked Single)
51. Row 1 / Column 5 → 4 (Naked Single)
52. Row 3 / Column 3 → 9 (Naked Single)
53. Row 9 / Column 3 → 1 (Full House)
54. Row 7 / Column 1 → 9 (Full House)
55. Row 1 / Column 2 → 3 (Naked Single)
56. Row 1 / Column 7 → 1 (Full House)
57. Row 3 / Column 1 → 5 (Naked Single)
58. Row 9 / Column 8 → 8 (Naked Single)
59. Row 7 / Column 8 → 1 (Full House)
60. Row 7 / Column 6 → 8 (Full House)
61. Row 9 / Column 4 → 9 (Full House)
62. Row 2 / Column 6 → 9 (Full House)
63. Row 6 / Column 4 → 8 (Full House)
64. Row 2 / Column 5 → 8 (Full House)
65. Row 6 / Column 5 → 9 (Full House)
66. Row 2 / Column 1 → 4 (Naked Single)
67. Row 3 / Column 2 → 1 (Full House)
68. Row 6 / Column 2 → 5 (Full House)
69. Row 3 / Column 7 → 8 (Full House)
70. Row 6 / Column 1 → 3 (Full House)
71. Row 2 / Column 7 → 3 (Full House)