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

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

Try To Solve This Puzzle

## Solution Steps:

1. Row 5 / Column 5 → 7 (Hidden Single)
2. Row 6 / Column 7 → 8 (Hidden Single)
3. Row 5 / Column 3 → 8 (Hidden Single)
4. Row 3 / Column 4 → 2 (Hidden Single)
5. Row 4 / Column 6 → 1 (Hidden Single)
6. Row 6 / Column 4 → 3 (Hidden Single)
7. Locked Pair: 4,5 in r13c5 => r2c46,r3c6,r7c5<>4, r2c46,r3c6,r79c5<>5
8. Locked Pair: 4,7 in r8c46 => r7c6,r8c23<>4, r7c6,r8c238,r9c4<>7
9. Locked Candidates Type 1 (Pointing): 6 in b9 => r9c123<>6
10. Locked Candidates Type 2 (Claiming): 6 in c1 => r13c3,r23c2<>6
11. Locked Candidates Type 2 (Claiming): 1 in c8 => r7c79,r9c79<>1
12. Hidden Pair: 1,3 in r78c8 => r7c8<>2, r7c8<>7
13. Locked Candidates Type 1 (Pointing): 7 in b9 => r123c7<>7
14. Naked Pair: 1,3 in r7c58 => r7c123<>3, r7c2<>1
15. Hidden Rectangle: 1/4 in r3c79,r5c79 => r3c7<>4
16. XY-Chain: 5 5- r2c8 -7- r2c4 -8- r9c4 -5- r4c4 -4- r6c6 -5 => r6c8<>5
17. Row 6 / Column 8 → 9 (Naked Single)
18. Naked Triple: 3,4,5 in r5c12,r6c2 => r4c23<>4, r4c23<>5
19. 2-String Kite: 5 in r6c2,r9c4 (connected by r4c4,r6c6) => r9c2<>5
20. Empty Rectangle: 4 in b4 (r2c27) => r5c7<>4
21. Locked Candidates Type 1 (Pointing): 4 in b6 => r13c9<>4
22. XY-Chain: 5 5- r2c8 -7- r2c4 -8- r9c4 -5- r7c6 -8- r7c9 -2- r4c9 -4- r5c9 -1- r5c7 -5 => r123c7,r4c8<>5
23. Row 4 / Column 8 → 2 (Naked Single)
24. Row 4 / Column 9 → 4 (Naked Single)
25. Row 4 / Column 4 → 5 (Naked Single)
26. Row 6 / Column 6 → 4 (Full House)
27. Row 6 / Column 2 → 5 (Full House)
28. Row 5 / Column 9 → 1 (Naked Single)
29. Row 5 / Column 7 → 5 (Full House)
30. Row 9 / Column 4 → 8 (Naked Single)
31. Row 8 / Column 6 → 7 (Naked Single)
32. Row 2 / Column 4 → 7 (Naked Single)
33. Row 8 / Column 4 → 4 (Full House)
34. Row 7 / Column 6 → 5 (Naked Single)
35. Row 3 / Column 6 → 6 (Naked Single)
36. Row 2 / Column 6 → 8 (Full House)
37. Row 2 / Column 2 → 4 (Naked Single)
38. Row 2 / Column 8 → 5 (Naked Single)
39. Row 2 / Column 7 → 6 (Full House)
40. Row 3 / Column 7 → 1 (Naked Single)
41. Row 3 / Column 9 → 9 (Naked Single)
42. Row 5 / Column 2 → 3 (Naked Single)
43. Row 5 / Column 1 → 4 (Full House)
44. Row 1 / Column 8 → 7 (Naked Single)
45. Row 1 / Column 9 → 2 (Naked Single)
46. Row 1 / Column 7 → 4 (Full House)
47. Row 3 / Column 2 → 7 (Naked Single)
48. Row 7 / Column 1 → 9 (Naked Single)
49. Row 7 / Column 9 → 8 (Naked Single)
50. Row 9 / Column 9 → 6 (Full House)
51. Row 1 / Column 5 → 5 (Naked Single)
52. Row 3 / Column 5 → 4 (Full House)
53. Row 7 / Column 2 → 2 (Naked Single)
54. Row 1 / Column 1 → 6 (Naked Single)
55. Row 1 / Column 3 → 9 (Full House)
56. Row 7 / Column 7 → 7 (Naked Single)
57. Row 9 / Column 7 → 2 (Full House)
58. Row 9 / Column 2 → 1 (Naked Single)
59. Row 4 / Column 3 → 6 (Naked Single)
60. Row 4 / Column 2 → 9 (Full House)
61. Row 8 / Column 2 → 6 (Full House)
62. Row 7 / Column 3 → 4 (Naked Single)
63. Row 9 / Column 5 → 3 (Naked Single)
64. Row 7 / Column 5 → 1 (Full House)
65. Row 7 / Column 8 → 3 (Full House)
66. Row 8 / Column 8 → 1 (Full House)
67. Row 8 / Column 3 → 3 (Full House)
68. Row 9 / Column 1 → 5 (Naked Single)
69. Row 3 / Column 1 → 3 (Full House)
70. Row 3 / Column 3 → 5 (Full House)
71. Row 9 / Column 3 → 7 (Full House)