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

This Sudoku Puzzle has 74 steps and it is solved using Naked Single, Full House, Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Hidden Triple, undefined, Uniqueness Test 3, Hidden Rectangle techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 2 / Column 5 → 3 (Naked Single)
2. Row 2 / Column 4 → 9 (Naked Single)
3. Row 2 / Column 6 → 4 (Naked Single)
4. Row 2 / Column 2 → 6 (Naked Single)
5. Row 2 / Column 8 → 7 (Full House)
6. Row 6 / Column 2 → 1 (Hidden Single)
7. Row 6 / Column 9 → 7 (Hidden Single)
8. Row 6 / Column 8 → 4 (Hidden Single)
9. Locked Candidates Type 1 (Pointing): 3 in b6 => r5c123<>3
10. Locked Candidates Type 1 (Pointing): 3 in b4 => r4c46<>3
11. Locked Candidates Type 1 (Pointing): 4 in b9 => r7c123<>4
12. Locked Candidates Type 2 (Claiming): 5 in r6 => r4c46,r5c5<>5
13. Hidden Triple: 1,6,7 in r789c1 => r78c1<>3, r789c1<>5, r789c1<>9, r8c1<>4
14. Row 8 / Column 2 → 4 (Hidden Single)
15. Locked Candidates Type 1 (Pointing): 3 in b7 => r7c4<>3
16. W-Wing: 5/6 in r4c8,r8c5 connected by 6 in r4c4,r5c5 => r8c8<>5
17. Locked Candidates Type 2 (Claiming): 5 in r8 => r7c45,r9c56<>5
18. XY-Wing: 5/8/2 in r14c6,r3c4 => r4c4<>2
19. Row 4 / Column 6 → 2 (Hidden Single)
20. Uniqueness Test 3: 3/5 in r6c46,r8c46 => r8c5<>6
21. Row 8 / Column 5 → 5 (Naked Single)
22. Hidden Rectangle: 6/7 in r7c15,r9c15 => r9c5<>6
23. 2-String Kite: 6 in r4c8,r7c5 (connected by r4c4,r5c5) => r7c8<>6
24. XY-Chain: 6 6- r5c5 -8- r1c5 -1- r3c5 -2- r3c4 -5- r6c4 -3- r8c4 -6 => r4c4,r7c5<>6
25. Row 4 / Column 4 → 8 (Naked Single)
26. Row 5 / Column 5 → 6 (Naked Single)
27. Row 5 / Column 9 → 3 (Naked Single)
28. Row 5 / Column 7 → 5 (Naked Single)
29. Row 4 / Column 8 → 6 (Full House)
30. Row 5 / Column 2 → 8 (Hidden Single)
31. Row 7 / Column 8 → 5 (Hidden Single)
32. Locked Candidates Type 2 (Claiming): 9 in c2 => r79c3<>9
33. XY-Wing: 1/9/6 in r8c18,r9c7 => r9c1<>6
34. Locked Candidates Type 2 (Claiming): 6 in r9 => r7c79<>6
35. XY-Chain: 4 4- r3c9 -1- r3c5 -2- r3c4 -5- r6c4 -3- r8c4 -6- r8c1 -1- r8c8 -9- r7c7 -4 => r13c7,r7c9<>4
36. Row 7 / Column 9 → 8 (Naked Single)
37. Row 7 / Column 7 → 4 (Hidden Single)
38. Row 7 / Column 2 → 9 (Hidden Single)
39. Row 9 / Column 2 → 5 (Naked Single)
40. Row 4 / Column 2 → 3 (Full House)
41. Row 4 / Column 1 → 5 (Full House)
42. Row 9 / Column 3 → 2 (Naked Single)
43. Row 7 / Column 3 → 3 (Naked Single)
44. Hidden Rectangle: 3/9 in r1c17,r3c17 => r1c1<>9
45. XY-Chain: 9 9- r1c8 -1- r1c5 -8- r9c5 -7- r9c1 -1- r9c9 -6- r9c7 -9 => r13c7,r8c8<>9
46. Row 3 / Column 7 → 3 (Naked Single)
47. Row 8 / Column 8 → 1 (Naked Single)
48. Row 1 / Column 8 → 9 (Full House)
49. Row 1 / Column 7 → 6 (Naked Single)
50. Row 9 / Column 7 → 9 (Full House)
51. Row 9 / Column 9 → 6 (Full House)
52. Row 8 / Column 1 → 6 (Naked Single)
53. Row 9 / Column 6 → 8 (Naked Single)
54. Row 7 / Column 1 → 7 (Naked Single)
55. Row 9 / Column 1 → 1 (Full House)
56. Row 9 / Column 5 → 7 (Full House)
57. Row 8 / Column 4 → 3 (Naked Single)
58. Row 8 / Column 6 → 9 (Full House)
59. Row 1 / Column 6 → 5 (Naked Single)
60. Row 6 / Column 6 → 3 (Full House)
61. Row 6 / Column 4 → 5 (Full House)
62. Row 7 / Column 5 → 2 (Naked Single)
63. Row 7 / Column 4 → 6 (Full House)
64. Row 3 / Column 4 → 2 (Full House)
65. Row 1 / Column 3 → 4 (Naked Single)
66. Row 3 / Column 5 → 1 (Naked Single)
67. Row 1 / Column 5 → 8 (Full House)
68. Row 1 / Column 1 → 3 (Naked Single)
69. Row 1 / Column 9 → 1 (Full House)
70. Row 3 / Column 9 → 4 (Full House)
71. Row 3 / Column 1 → 9 (Naked Single)
72. Row 3 / Column 3 → 5 (Full House)
73. Row 5 / Column 3 → 9 (Full House)
74. Row 5 / Column 1 → 4 (Full House)