2
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9
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1
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1
5
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9
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2
1

This Sudoku Puzzle has 79 steps and it is solved using Locked Candidates Type 1 (Pointing), undefined, Discontinuous Nice Loop, Grouped Discontinuous Nice Loop, Hidden Pair, Empty Rectangle, Hidden Single, Naked Single, Full House, AIC, Naked Triple, Hidden Rectangle techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Locked Candidates Type 1 (Pointing): 2 in b2 => r9c4<>2
2. Locked Candidates Type 1 (Pointing): 2 in b4 => r7c3<>2
3. Locked Candidates Type 1 (Pointing): 5 in b5 => r9c4<>5
4. Locked Candidates Type 1 (Pointing): 6 in b7 => r3c1<>6
5. 2-String Kite: 4 in r4c7,r7c3 (connected by r4c2,r5c3) => r7c7<>4
6. Discontinuous Nice Loop: 1 r2c4 -1- r6c4 -5- r6c8 -2- r2c8 =2= r2c4 => r2c4<>1
7. Discontinuous Nice Loop: 7 r2c5 -7- r2c3 -9- r6c3 =9= r6c6 =1= r6c4 -1- r3c4 =1= r2c5 => r2c5<>7
8. Discontinuous Nice Loop: 5 r9c8 -5- r9c5 =5= r8c5 =1= r2c5 -1- r3c4 =1= r6c4 =5= r6c8 -5- r9c8 => r9c8<>5
9. Grouped Discontinuous Nice Loop: 5 r3c1 -5- r789c1 =5= r7c3 =4= r5c3 -4- r4c2 -8- r5c1 =8= r3c1 => r3c1<>5
10. Locked Candidates Type 1 (Pointing): 5 in b1 => r7c3<>5
11. Hidden Pair: 5,6 in r13c3 => r13c3<>7, r1c3<>9
12. Empty Rectangle: 7 in b9 (r27c3) => r2c8<>7
13. XY-Chain: 1 1- r3c1 -8- r5c1 -9- r6c3 -2- r6c8 -5- r6c4 -1 => r3c4<>1
14. Row 6 / Column 4 → 1 (Hidden Single)
15. Row 6 / Column 6 → 9 (Naked Single)
16. Row 6 / Column 3 → 2 (Naked Single)
17. Row 6 / Column 8 → 5 (Full House)
18. Row 2 / Column 5 → 1 (Hidden Single)
19. Row 4 / Column 4 → 5 (Hidden Single)
20. Row 5 / Column 7 → 2 (Hidden Single)
21. Empty Rectangle: 3 in b8 (r4c67) => r8c7<>3
22. AIC: 4 4- r1c8 =4= r1c9 =9= r1c2 -9- r2c3 =9= r5c3 =4= r5c9 -4- r4c7 =4= r9c7 -4 => r79c8<>4
23. Row 1 / Column 8 → 4 (Hidden Single)
24. X-Wing: 4 r49 c27 => r7c2<>4
25. Discontinuous Nice Loop: 7 r3c2 -7- r2c3 -9- r5c3 =9= r5c1 =8= r3c1 =1= r3c2 => r3c2<>7
26. Discontinuous Nice Loop: 5 r7c9 -5- r7c1 -1- r3c1 -8- r5c1 -9- r5c3 -4- r5c9 =4= r7c9 => r7c9<>5
27. Locked Candidates Type 1 (Pointing): 5 in b9 => r3c7<>5
28. Naked Triple: 1,3,8 in r3c127 => r3c489<>3, r3c48<>8
29. XY-Wing: 3/4/8 in r34c7,r4c2 => r3c2<>8
30. Hidden Rectangle: 2/7 in r2c48,r3c48 => r2c4<>7
31. Discontinuous Nice Loop: 3 r7c7 -3- r3c7 -8- r3c1 =8= r5c1 -8- r4c2 -4- r4c7 -3- r7c7 => r7c7<>3
32. XY-Wing: 1/5/8 in r37c1,r7c7 => r3c7<>8
33. Row 3 / Column 7 → 3 (Naked Single)
34. Row 3 / Column 2 → 1 (Naked Single)
35. Row 4 / Column 7 → 4 (Naked Single)
36. Row 5 / Column 9 → 3 (Full House)
37. Row 3 / Column 1 → 8 (Naked Single)
38. Row 4 / Column 2 → 8 (Naked Single)
39. Row 4 / Column 6 → 3 (Full House)
40. Row 5 / Column 1 → 9 (Naked Single)
41. Row 5 / Column 3 → 4 (Full House)
42. Row 7 / Column 3 → 7 (Naked Single)
43. Row 2 / Column 3 → 9 (Naked Single)
44. Row 7 / Column 2 → 2 (Naked Single)
45. Row 7 / Column 9 → 4 (Naked Single)
46. Row 8 / Column 2 → 9 (Naked Single)
47. Row 2 / Column 9 → 7 (Naked Single)
48. Row 8 / Column 7 → 5 (Naked Single)
49. Row 9 / Column 2 → 4 (Naked Single)
50. Row 2 / Column 2 → 3 (Naked Single)
51. Row 1 / Column 2 → 7 (Full House)
52. Row 3 / Column 8 → 2 (Naked Single)
53. Row 3 / Column 9 → 5 (Naked Single)
54. Row 1 / Column 9 → 9 (Full House)
55. Row 2 / Column 8 → 8 (Full House)
56. Row 2 / Column 4 → 2 (Full House)
57. Row 7 / Column 7 → 8 (Naked Single)
58. Row 9 / Column 7 → 9 (Full House)
59. Row 3 / Column 3 → 6 (Naked Single)
60. Row 1 / Column 3 → 5 (Full House)
61. Row 3 / Column 4 → 7 (Full House)
62. Row 7 / Column 8 → 3 (Naked Single)
63. Row 7 / Column 6 → 1 (Naked Single)
64. Row 7 / Column 1 → 5 (Full House)
65. Row 9 / Column 4 → 8 (Naked Single)
66. Row 8 / Column 6 → 7 (Naked Single)
67. Row 9 / Column 1 → 6 (Naked Single)
68. Row 8 / Column 1 → 1 (Full House)
69. Row 5 / Column 4 → 6 (Naked Single)
70. Row 1 / Column 4 → 3 (Full House)
71. Row 8 / Column 5 → 3 (Naked Single)
72. Row 8 / Column 8 → 6 (Full House)
73. Row 9 / Column 8 → 7 (Full House)
74. Row 9 / Column 5 → 5 (Naked Single)
75. Row 9 / Column 6 → 2 (Full House)
76. Row 5 / Column 6 → 8 (Naked Single)
77. Row 1 / Column 6 → 6 (Full House)
78. Row 1 / Column 5 → 8 (Full House)
79. Row 5 / Column 5 → 7 (Full House)