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

This Sudoku Puzzle has 84 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Finned Swordfish, Sue de Coq, Discontinuous Nice Loop, Naked Single, Locked Candidates Type 2 (Claiming), Full House, Hidden Pair, undefined, Hidden Rectangle, AIC techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 4 / Column 8 → 6 (Hidden Single)
2. Row 7 / Column 2 → 6 (Hidden Single)
3. Locked Candidates Type 1 (Pointing): 5 in b4 => r5c579<>5
4. Row 8 / Column 5 → 5 (Hidden Single)
5. Locked Candidates Type 1 (Pointing): 9 in b4 => r123c2<>9
6. Locked Candidates Type 1 (Pointing): 2 in b7 => r23c1<>2
7. Finned Swordfish: 1 c357 r579 fr4c7 => r5c9<>1
8. Finned Swordfish: 1 c359 r579 fr4c9 fr6c9 => r5c7<>1
9. Sue de Coq: r4c79 - {1579} (r4c46 - {145}, r5c789,r6c8 - {23789}) => r6c9<>3, r6c9<>8, r6c9<>9, r4c2<>1, r4c2<>4
10. Locked Candidates Type 1 (Pointing): 4 in b4 => r5c5<>4
11. Discontinuous Nice Loop: 7 r2c2 -7- r4c2 -9- r6c2 -1- r6c9 -5- r2c9 =5= r2c1 =1= r2c2 => r2c2<>7
12. Discontinuous Nice Loop: 7 r4c7 -7- r4c2 -9- r6c2 -1- r2c2 =1= r2c1 =5= r2c9 -5- r1c7 =5= r4c7 => r4c7<>7
13. Discontinuous Nice Loop: 7 r5c3 -7- r4c2 -9- r6c2 -1- r6c9 -5- r2c9 =5= r2c1 -5- r5c1 =5= r5c3 => r5c3<>7
14. Discontinuous Nice Loop: 1 r6c2 -1- r6c9 -5- r2c9 =5= r2c1 =1= r2c2 -1- r6c2 => r6c2<>1
15. Row 6 / Column 2 → 9 (Naked Single)
16. Row 4 / Column 2 → 7 (Naked Single)
17. Locked Candidates Type 1 (Pointing): 1 in b4 => r5c5<>1
18. Locked Candidates Type 1 (Pointing): 1 in b5 => r789c6<>1
19. Locked Candidates Type 2 (Claiming): 1 in r8 => r7c13,r9c13<>1
20. Row 5 / Column 3 → 1 (Hidden Single)
21. Row 5 / Column 2 → 4 (Naked Single)
22. Row 5 / Column 1 → 5 (Full House)
23. Row 1 / Column 3 → 5 (Hidden Single)
24. Row 2 / Column 9 → 5 (Hidden Single)
25. Row 6 / Column 9 → 1 (Naked Single)
26. Row 4 / Column 9 → 9 (Naked Single)
27. Row 4 / Column 7 → 5 (Naked Single)
28. Row 4 / Column 4 → 4 (Naked Single)
29. Row 4 / Column 6 → 1 (Full House)
30. Row 6 / Column 4 → 5 (Hidden Single)
31. Locked Candidates Type 1 (Pointing): 7 in b1 => r789c1<>7
32. Locked Candidates Type 2 (Claiming): 7 in r8 => r79c6,r9c4<>7
33. Locked Candidates Type 2 (Claiming): 3 in c4 => r7c56,r89c6,r9c5<>3
34. Hidden Pair: 1,9 in r7c57 => r7c5<>4, r7c7<>7
35. X-Wing: 9 c48 r29 => r2c15,r9c57<>9
36. W-Wing: 8/3 in r1c2,r5c5 connected by 3 in r16c6 => r1c5<>8
37. XYZ-Wing: 4/7/8 in r2c56,r8c6 => r1c6<>4
38. Hidden Rectangle: 2/4 in r7c16,r9c16 => r9c1<>4
39. Finned Swordfish: 8 r168 c268 fr1c7 fr1c9 => r2c8<>8
40. Finned Swordfish: 8 r268 c268 fr2c5 => r1c6<>8
41. AIC: 9 9- r2c4 =9= r2c8 =2= r2c2 =1= r8c2 =8= r8c8 -8- r6c8 -3- r6c6 =3= r1c6 -3- r1c2 -8- r1c7 -9- r7c7 =9= r7c5 -9 => r13c5,r9c4<>9
42. Row 9 / Column 4 → 3 (Naked Single)
43. Row 8 / Column 4 → 7 (Naked Single)
44. Row 2 / Column 4 → 9 (Full House)
45. Row 9 / Column 1 → 2 (Naked Single)
46. Row 8 / Column 6 → 4 (Naked Single)
47. Row 7 / Column 6 → 2 (Naked Single)
48. Row 9 / Column 6 → 6 (Naked Single)
49. Row 9 / Column 5 → 1 (Naked Single)
50. Row 7 / Column 5 → 9 (Full House)
51. Row 7 / Column 7 → 1 (Naked Single)
52. Row 9 / Column 8 → 9 (Hidden Single)
53. Row 2 / Column 8 → 4 (Hidden Single)
54. Row 2 / Column 5 → 8 (Naked Single)
55. Row 2 / Column 6 → 7 (Naked Single)
56. Row 5 / Column 5 → 3 (Naked Single)
57. Row 6 / Column 6 → 8 (Full House)
58. Row 1 / Column 6 → 3 (Full House)
59. Row 6 / Column 8 → 3 (Full House)
60. Row 2 / Column 1 → 1 (Naked Single)
61. Row 2 / Column 2 → 2 (Full House)
62. Row 1 / Column 2 → 8 (Naked Single)
63. Row 8 / Column 8 → 8 (Naked Single)
64. Row 5 / Column 8 → 2 (Full House)
65. Row 8 / Column 1 → 3 (Naked Single)
66. Row 8 / Column 2 → 1 (Full House)
67. Row 3 / Column 2 → 3 (Full House)
68. Row 1 / Column 7 → 9 (Naked Single)
69. Row 1 / Column 9 → 6 (Naked Single)
70. Row 3 / Column 3 → 4 (Naked Single)
71. Row 9 / Column 7 → 7 (Naked Single)
72. Row 7 / Column 1 → 4 (Naked Single)
73. Row 1 / Column 5 → 4 (Naked Single)
74. Row 1 / Column 1 → 7 (Full House)
75. Row 3 / Column 1 → 9 (Full House)
76. Row 3 / Column 5 → 6 (Full House)
77. Row 3 / Column 9 → 8 (Naked Single)
78. Row 3 / Column 7 → 2 (Full House)
79. Row 5 / Column 7 → 8 (Full House)
80. Row 5 / Column 9 → 7 (Full House)
81. Row 7 / Column 3 → 7 (Naked Single)
82. Row 9 / Column 3 → 8 (Full House)
83. Row 9 / Column 9 → 4 (Full House)
84. Row 7 / Column 9 → 3 (Full House)