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

This Sudoku Puzzle has 71 steps and it is solved using Hidden Single, Locked Pair, Locked Candidates Type 1 (Pointing), Naked Single, Locked Candidates Type 2 (Claiming), Naked Triple, Hidden Rectangle, undefined, Full House techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 1 / Column 3 → 9 (Hidden Single)
2. Row 6 / Column 6 → 6 (Hidden Single)
3. Row 2 / Column 5 → 7 (Hidden Single)
4. Row 1 / Column 2 → 7 (Hidden Single)
5. Row 3 / Column 2 → 5 (Hidden Single)
6. Row 2 / Column 2 → 2 (Hidden Single)
7. Locked Pair: 3,9 in r89c5 => r46c5,r7c46,r9c46<>3, r4c5,r79c6<>9
8. Locked Candidates Type 1 (Pointing): 8 in b1 => r2c79<>8
9. Locked Candidates Type 1 (Pointing): 1 in b2 => r4c6<>1
10. Locked Candidates Type 1 (Pointing): 2 in b3 => r1c46<>2
11. Locked Candidates Type 1 (Pointing): 8 in b5 => r5c23<>8
12. Row 5 / Column 2 → 3 (Naked Single)
13. Row 4 / Column 1 → 5 (Naked Single)
14. Row 5 / Column 4 → 8 (Naked Single)
15. Row 6 / Column 1 → 8 (Naked Single)
16. Row 5 / Column 6 → 9 (Naked Single)
17. Row 4 / Column 6 → 3 (Hidden Single)
18. Row 2 / Column 3 → 8 (Hidden Single)
19. Row 4 / Column 7 → 9 (Hidden Single)
20. Locked Candidates Type 1 (Pointing): 5 in b8 => r9c79<>5
21. Locked Candidates Type 2 (Claiming): 8 in r8 => r7c79,r9c79<>8
22. Naked Triple: 1,3,5 in r1c468 => r1c79<>3, r1c9<>1
23. Naked Triple: 3,6,9 in r8c135 => r8c79<>3, r8c7<>6
24. Locked Candidates Type 2 (Claiming): 6 in r8 => r7c1<>6
25. Naked Triple: 3,4,6 in r279c7 => r6c7<>3
26. Hidden Rectangle: 3/7 in r6c89,r7c89 => r7c9<>3
27. XY-Chain: 3 3- r1c8 -1- r1c6 -5- r1c4 -3- r3c4 -2- r7c4 -6- r7c7 -3 => r2c7,r79c8<>3
28. Locked Candidates Type 2 (Claiming): 3 in c7 => r9c9<>3
29. W-Wing: 1/4 in r2c6,r9c9 connected by 4 in r29c7 => r2c9<>1
30. Row 2 / Column 6 → 1 (Hidden Single)
31. Row 1 / Column 6 → 5 (Naked Single)
32. Row 1 / Column 4 → 3 (Naked Single)
33. Row 9 / Column 6 → 8 (Naked Single)
34. Row 1 / Column 8 → 1 (Naked Single)
35. Row 3 / Column 4 → 2 (Naked Single)
36. Row 3 / Column 6 → 4 (Full House)
37. Row 7 / Column 6 → 2 (Full House)
38. Row 9 / Column 2 → 1 (Naked Single)
39. Row 7 / Column 2 → 8 (Full House)
40. Row 7 / Column 4 → 6 (Naked Single)
41. Row 9 / Column 4 → 5 (Full House)
42. Row 9 / Column 9 → 4 (Naked Single)
43. Row 7 / Column 7 → 3 (Naked Single)
44. Row 2 / Column 9 → 3 (Naked Single)
45. Row 4 / Column 9 → 2 (Naked Single)
46. Row 7 / Column 1 → 9 (Naked Single)
47. Row 9 / Column 7 → 6 (Naked Single)
48. Row 2 / Column 1 → 6 (Naked Single)
49. Row 2 / Column 7 → 4 (Full House)
50. Row 3 / Column 3 → 3 (Full House)
51. Row 3 / Column 8 → 6 (Full House)
52. Row 8 / Column 1 → 3 (Full House)
53. Row 8 / Column 3 → 6 (Full House)
54. Row 1 / Column 9 → 8 (Naked Single)
55. Row 1 / Column 7 → 2 (Full House)
56. Row 4 / Column 5 → 1 (Naked Single)
57. Row 4 / Column 3 → 4 (Full House)
58. Row 6 / Column 5 → 2 (Full House)
59. Row 6 / Column 7 → 5 (Naked Single)
60. Row 8 / Column 7 → 8 (Full House)
61. Row 7 / Column 8 → 7 (Naked Single)
62. Row 7 / Column 9 → 1 (Full House)
63. Row 9 / Column 8 → 9 (Naked Single)
64. Row 8 / Column 9 → 5 (Full House)
65. Row 8 / Column 5 → 9 (Full House)
66. Row 6 / Column 9 → 7 (Full House)
67. Row 9 / Column 5 → 3 (Full House)
68. Row 5 / Column 3 → 7 (Naked Single)
69. Row 5 / Column 8 → 4 (Full House)
70. Row 6 / Column 8 → 3 (Full House)
71. Row 6 / Column 3 → 1 (Full House)