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

This Sudoku Puzzle has 68 steps and it is solved using Hidden Single, Naked Single, Full House, Locked Candidates Type 1 (Pointing), Naked Pair, Uniqueness Test 1, Hidden Rectangle, Finned Swordfish, Sue de Coq, undefined techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 1 / Column 6 → 5 (Hidden Single)
2. Row 8 / Column 3 → 5 (Hidden Single)
3. Row 8 / Column 7 → 6 (Naked Single)
4. Row 8 / Column 8 → 7 (Naked Single)
5. Row 8 / Column 2 → 1 (Naked Single)
6. Row 8 / Column 4 → 4 (Naked Single)
7. Row 8 / Column 6 → 8 (Full House)
8. Row 9 / Column 9 → 3 (Naked Single)
9. Row 7 / Column 8 → 2 (Naked Single)
10. Row 9 / Column 7 → 5 (Full House)
11. Row 3 / Column 9 → 8 (Hidden Single)
12. Row 4 / Column 9 → 4 (Naked Single)
13. Row 1 / Column 9 → 7 (Full House)
14. Row 5 / Column 7 → 8 (Hidden Single)
15. Row 6 / Column 8 → 5 (Hidden Single)
16. Row 6 / Column 7 → 3 (Hidden Single)
17. Row 2 / Column 7 → 9 (Naked Single)
18. Row 1 / Column 7 → 1 (Full House)
19. Row 3 / Column 3 → 1 (Hidden Single)
20. Locked Candidates Type 1 (Pointing): 6 in b5 => r79c6<>6
21. Naked Pair: 1,9 in r4c58 => r4c16<>1, r4c136<>9
22. Row 6 / Column 1 → 1 (Hidden Single)
23. Locked Candidates Type 1 (Pointing): 4 in b4 => r13c2<>4
24. Uniqueness Test 1: 1/9 in r4c58,r5c58 => r5c5<>1, r5c5<>9
25. Hidden Rectangle: 6/8 in r4c13,r7c13 => r7c3<>6
26. Finned Swordfish: 9 r367 c246 fr7c1 fr7c3 => r9c2<>9
27. Sue de Coq: r1c123 - {23469} (r1c5 - {49}, r2c3 - {36}) => r2c1<>6, r3c2<>3, r1c8<>4
28. Naked Pair: 7,9 in r3c24 => r3c6<>7, r3c6<>9
29. W-Wing: 9/7 in r3c2,r7c6 connected by 7 in r2c16 => r7c2<>9
30. Sue de Coq: r456c6 - {124679} (r23c6 - {347}, r4c5,r6c4 - {129}) => r79c6<>7
31. Row 7 / Column 6 → 9 (Naked Single)
32. Row 9 / Column 1 → 9 (Hidden Single)
33. X-Wing: 9 r36 c24 => r15c2<>9
34. 2-String Kite: 7 in r3c4,r7c1 (connected by r2c1,r3c2) => r7c4<>7
35. Row 7 / Column 4 → 6 (Naked Single)
36. Row 9 / Column 2 → 6 (Hidden Single)
37. Row 5 / Column 2 → 4 (Naked Single)
38. Row 5 / Column 5 → 7 (Naked Single)
39. Row 9 / Column 5 → 1 (Naked Single)
40. Row 4 / Column 5 → 9 (Naked Single)
41. Row 1 / Column 5 → 4 (Full House)
42. Row 9 / Column 6 → 2 (Naked Single)
43. Row 9 / Column 4 → 7 (Full House)
44. Row 4 / Column 8 → 1 (Naked Single)
45. Row 5 / Column 8 → 9 (Full House)
46. Row 6 / Column 4 → 2 (Naked Single)
47. Row 3 / Column 4 → 9 (Full House)
48. Row 1 / Column 1 → 6 (Naked Single)
49. Row 3 / Column 6 → 3 (Naked Single)
50. Row 2 / Column 6 → 7 (Full House)
51. Row 4 / Column 6 → 6 (Naked Single)
52. Row 6 / Column 6 → 4 (Naked Single)
53. Row 6 / Column 2 → 9 (Full House)
54. Row 5 / Column 6 → 1 (Full House)
55. Row 5 / Column 3 → 6 (Full House)
56. Row 3 / Column 2 → 7 (Naked Single)
57. Row 3 / Column 8 → 4 (Full House)
58. Row 1 / Column 8 → 3 (Naked Single)
59. Row 2 / Column 8 → 6 (Full House)
60. Row 2 / Column 3 → 3 (Naked Single)
61. Row 2 / Column 1 → 4 (Full House)
62. Row 4 / Column 1 → 8 (Naked Single)
63. Row 4 / Column 3 → 2 (Full House)
64. Row 7 / Column 1 → 7 (Full House)
65. Row 7 / Column 2 → 3 (Naked Single)
66. Row 1 / Column 2 → 2 (Full House)
67. Row 7 / Column 3 → 8 (Full House)
68. Row 1 / Column 3 → 9 (Full House)