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

This Sudoku Puzzle has 89 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), undefined, Locked Pair, Naked Triple, Empty Rectangle, AIC, Uniqueness Test 4, Hidden Rectangle, Naked Single, Continuous Nice Loop, Locked Triple, Full House techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 6 / Column 7 → 1 (Hidden Single)
2. Row 4 / Column 8 → 2 (Hidden Single)
3. Row 2 / Column 5 → 5 (Hidden Single)
4. Row 8 / Column 9 → 2 (Hidden Single)
5. Row 3 / Column 7 → 8 (Hidden Single)
6. Row 7 / Column 5 → 2 (Hidden Single)
7. Row 7 / Column 4 → 3 (Hidden Single)
8. Row 8 / Column 4 → 4 (Hidden Single)
9. Locked Candidates Type 1 (Pointing): 3 in b2 => r4c6<>3
10. Locked Candidates Type 1 (Pointing): 7 in b2 => r4c6<>7
11. Locked Candidates Type 1 (Pointing): 3 in b6 => r5c5<>3
12. Locked Candidates Type 1 (Pointing): 5 in b7 => r3c2<>5
13. Locked Candidates Type 1 (Pointing): 8 in b8 => r8c1<>8
14. Locked Candidates Type 2 (Claiming): 1 in r7 => r89c2<>1
15. Locked Candidates Type 2 (Claiming): 6 in c4 => r123c6<>6
16. XYZ-Wing: 4/5/6 in r79c7,r9c2 => r9c9<>4
17. Locked Candidates Type 1 (Pointing): 4 in b9 => r45c7<>4
18. Locked Pair: 7,9 in r45c7 => r1c7,r5c9<>7, r1c7,r5c8<>9
19. Locked Candidates Type 1 (Pointing): 4 in b6 => r5c3<>4
20. Naked Triple: 1,6,9 in r9c569 => r9c7<>6
21. Empty Rectangle: 6 in b7 (r17c7) => r1c1<>6
22. AIC: 4 4- r3c1 =4= r7c1 =8= r7c3 -8- r5c3 =8= r5c5 -8- r8c5 -6- r8c1 -7- r8c2 -5- r9c2 -4 => r23c2,r7c1<>4
23. Row 3 / Column 1 → 4 (Hidden Single)
24. Locked Candidates Type 1 (Pointing): 6 in b1 => r7c3<>6
25. Uniqueness Test 4: 3/4 in r2c89,r5c89 => r2c89<>3
26. AIC: 7 7- r1c1 -3- r2c2 =3= r2c6 =8= r8c6 -8- r8c5 -6- r8c1 =6= r7c1 =8= r7c3 -8- r5c3 -7 => r123c3,r6c1<>7
27. Locked Candidates Type 2 (Claiming): 7 in c3 => r46c2<>7
28. XY-Chain: 8 8- r6c1 -3- r1c1 -7- r8c1 -6- r8c5 -8 => r6c5<>8
29. XY-Chain: 6 6- r4c6 -9- r6c4 -8- r6c1 -3- r1c1 -7- r8c1 -6 => r8c6<>6
30. Hidden Rectangle: 6/9 in r4c56,r9c56 => r4c6<>9
31. Row 4 / Column 6 → 6 (Naked Single)
32. Continuous Nice Loop: 3/7 8= r2c6 =3= r2c2 -3- r1c1 -7- r8c1 -6- r8c5 -8- r8c6 =8= r2c6 =3 => r3c2<>3, r2c6<>7
33. AIC: 6 6- r1c7 -5- r9c7 =5= r8c8 =1= r8c6 =8= r2c6 -8- r2c4 -6 => r1c4,r2c9<>6
34. XY-Chain: 2 2- r1c4 -9- r6c4 -8- r6c1 -3- r1c1 -7- r3c2 -2 => r1c3,r3c4<>2
35. Row 1 / Column 4 → 2 (Hidden Single)
36. Hidden Rectangle: 2/7 in r3c23,r6c23 => r6c3<>7
37. Row 6 / Column 5 → 7 (Hidden Single)
38. Row 4 / Column 5 → 3 (Hidden Single)
39. XY-Chain: 2 2- r3c2 -7- r1c1 -3- r6c1 -8- r6c3 -2 => r3c3,r6c2<>2
40. Row 3 / Column 2 → 2 (Hidden Single)
41. Row 6 / Column 3 → 2 (Hidden Single)
42. Locked Triple: 1,5,6 in r123c3 => r2c2,r7c3<>1
43. Row 7 / Column 2 → 1 (Hidden Single)
44. XY-Chain: 5 5- r1c7 -6- r7c7 -4- r7c3 -8- r5c3 -7- r5c7 -9- r5c5 -8- r6c4 -9- r3c4 -6- r3c3 -5 => r1c3,r3c8<>5
45. Row 3 / Column 3 → 5 (Hidden Single)
46. W-Wing: 1/6 in r1c3,r9c9 connected by 6 in r17c7 => r1c9<>1
47. XY-Chain: 3 3- r1c1 -7- r2c2 -3- r2c6 -8- r2c4 -6- r3c4 -9- r3c8 -3 => r1c89<>3
48. Locked Candidates Type 1 (Pointing): 3 in b3 => r3c6<>3
49. XY-Chain: 3 3- r1c1 -7- r1c9 -6- r1c3 -1- r2c3 -6- r2c4 -8- r2c6 -3 => r1c6,r2c2<>3
50. Row 2 / Column 2 → 7 (Naked Single)
51. Row 1 / Column 1 → 3 (Naked Single)
52. Row 8 / Column 2 → 5 (Naked Single)
53. Row 6 / Column 1 → 8 (Naked Single)
54. Row 8 / Column 8 → 1 (Naked Single)
55. Row 9 / Column 2 → 4 (Naked Single)
56. Row 5 / Column 3 → 7 (Naked Single)
57. Row 6 / Column 4 → 9 (Naked Single)
58. Row 5 / Column 5 → 8 (Full House)
59. Row 6 / Column 2 → 3 (Full House)
60. Row 4 / Column 2 → 9 (Full House)
61. Row 4 / Column 3 → 4 (Full House)
62. Row 4 / Column 7 → 7 (Full House)
63. Row 7 / Column 1 → 6 (Naked Single)
64. Row 8 / Column 1 → 7 (Full House)
65. Row 7 / Column 3 → 8 (Full House)
66. Row 7 / Column 7 → 4 (Full House)
67. Row 2 / Column 8 → 4 (Naked Single)
68. Row 8 / Column 6 → 8 (Naked Single)
69. Row 8 / Column 5 → 6 (Full House)
70. Row 9 / Column 5 → 9 (Full House)
71. Row 9 / Column 6 → 1 (Full House)
72. Row 9 / Column 9 → 6 (Naked Single)
73. Row 9 / Column 7 → 5 (Full House)
74. Row 5 / Column 7 → 9 (Naked Single)
75. Row 1 / Column 7 → 6 (Full House)
76. Row 3 / Column 4 → 6 (Naked Single)
77. Row 2 / Column 4 → 8 (Full House)
78. Row 2 / Column 9 → 1 (Naked Single)
79. Row 5 / Column 8 → 3 (Naked Single)
80. Row 5 / Column 9 → 4 (Full House)
81. Row 2 / Column 6 → 3 (Naked Single)
82. Row 2 / Column 3 → 6 (Full House)
83. Row 1 / Column 3 → 1 (Full House)
84. Row 1 / Column 9 → 7 (Naked Single)
85. Row 3 / Column 9 → 3 (Full House)
86. Row 3 / Column 8 → 9 (Naked Single)
87. Row 1 / Column 8 → 5 (Full House)
88. Row 1 / Column 6 → 9 (Full House)
89. Row 3 / Column 6 → 7 (Full House)