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

This Sudoku Puzzle has 88 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Hidden Pair, undefined, Skyscraper, Naked Pair, Naked Triple, Empty Rectangle, Naked Single, Finned Swordfish, Swordfish, Sue de Coq, Discontinuous Nice Loop, AIC, Full House techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 2 / Column 5 → 2 (Hidden Single)
2. Row 1 / Column 9 → 4 (Hidden Single)
3. Row 4 / Column 9 → 3 (Hidden Single)
4. Row 2 / Column 1 → 5 (Hidden Single)
5. Row 1 / Column 8 → 2 (Hidden Single)
6. Row 3 / Column 8 → 3 (Hidden Single)
7. Locked Candidates Type 1 (Pointing): 2 in b7 => r5c2<>2
8. Locked Candidates Type 2 (Claiming): 6 in r2 => r3c7<>6
9. Hidden Pair: 2,8 in r7c7,r9c9 => r7c7,r9c9<>1, r7c7<>5, r9c9<>6, r9c9<>9
10. Locked Candidates Type 1 (Pointing): 6 in b9 => r8c56<>6
11. X-Wing: 5 c57 r68 => r6c4,r8c6<>5
12. Skyscraper: 8 in r1c1,r3c5 (connected by r4c15) => r1c46,r3c3<>8
13. Locked Candidates Type 1 (Pointing): 8 in b2 => r3c7<>8
14. Locked Candidates Type 1 (Pointing): 8 in b3 => r2c3<>8
15. Naked Pair: 1,7 in r2c8,r3c7 => r2c79<>1, r2c7<>7
16. Naked Triple: 5,6,7 in r1c246 => r1c13<>7
17. Empty Rectangle: 1 in b9 (r2c38) => r8c3<>1
18. W-Wing: 1/7 in r2c3,r5c2 connected by 7 in r25c8 => r3c2,r456c3<>1
19. Sashimi X-Wing: 7 c28 r25 fr1c2 fr3c2 => r2c3<>7
20. Row 2 / Column 3 → 1 (Naked Single)
21. Row 2 / Column 8 → 7 (Naked Single)
22. Row 3 / Column 7 → 1 (Naked Single)
23. Finned Swordfish: 1 r468 c169 fr4c4 fr6c4 => r5c6<>1
24. XY-Chain: 7 7- r5c2 -1- r7c2 -2- r7c7 -8- r2c7 -6- r8c7 -5- r6c7 -7 => r6c13<>7
25. Naked Triple: 1,4,9 in r6c139 => r6c4<>1, r6c4<>4, r6c45<>9
26. Row 4 / Column 4 → 4 (Hidden Single)
27. Swordfish: 1 r468 c169 => r5c9,r7c16,r9c16<>1
28. Sue de Coq: r46c1 - {14789} (r179c1 - {3489}, r5c2 - {17}) => r45c3<>7, r8c1<>3, r8c1<>9
29. XY-Chain: 6 6- r1c2 -7- r5c2 -1- r7c2 -2- r7c7 -8- r2c7 -6- r8c7 -5- r6c7 -7- r6c4 -6 => r1c4<>6
30. XY-Wing: 6/7/5 in r16c4,r6c5 => r5c4<>5
31. Discontinuous Nice Loop: 7/8/9 r4c6 =1= r4c1 =8= r1c1 =3= r1c3 -3- r8c3 =3= r8c6 =1= r4c6 => r4c6<>7, r4c6<>8, r4c6<>9
32. Row 4 / Column 6 → 1 (Naked Single)
33. Sue de Coq: r5c46 - {5789} (r5c39 - {289}, r6c45 - {567}) => r5c8<>9
34. Locked Candidates Type 1 (Pointing): 9 in b6 => r8c9<>9
35. Sue de Coq: r7c46 - {13589} (r7c27 - {128}, r8c56 - {359}) => r9c46<>9, r7c8<>1
36. Sue de Coq: r789c1 - {13479} (r14c1 - {3789}, r79c2 - {124}) => r6c1<>9
37. XY-Chain: 1 1- r7c2 -2- r7c7 -8- r2c7 -6- r8c7 -5- r7c8 -9- r9c8 -1 => r9c2<>1
38. XY-Chain: 6 6- r6c4 -7- r6c7 -5- r8c7 -6- r2c7 -8- r7c7 -2- r9c9 -8- r9c6 -6 => r9c4<>6
39. Row 9 / Column 6 → 6 (Hidden Single)
40. Row 1 / Column 2 → 6 (Hidden Single)
41. Locked Candidates Type 1 (Pointing): 7 in b1 => r3c46<>7
42. AIC: 3/8 8- r1c1 =8= r4c1 -8- r4c5 =8= r3c5 -8- r3c6 -9- r8c6 -3- r8c3 =3= r1c3 -3 => r1c1<>3, r1c3<>8
43. Row 1 / Column 1 → 8 (Naked Single)
44. Row 1 / Column 3 → 3 (Naked Single)
45. Row 7 / Column 1 → 3 (Hidden Single)
46. Row 8 / Column 6 → 3 (Hidden Single)
47. Naked Triple: 4,7,9 in r368c3 => r45c3<>9
48. Skyscraper: 9 in r4c1,r8c3 (connected by r48c5) => r6c3,r9c1<>9
49. Row 6 / Column 3 → 4 (Naked Single)
50. Row 9 / Column 1 → 4 (Naked Single)
51. Row 3 / Column 3 → 7 (Naked Single)
52. Row 3 / Column 2 → 4 (Full House)
53. Row 6 / Column 1 → 1 (Naked Single)
54. Row 9 / Column 2 → 2 (Naked Single)
55. Row 8 / Column 3 → 9 (Naked Single)
56. Row 5 / Column 2 → 7 (Naked Single)
57. Row 7 / Column 2 → 1 (Full House)
58. Row 8 / Column 1 → 7 (Full House)
59. Row 4 / Column 1 → 9 (Full House)
60. Row 6 / Column 9 → 9 (Naked Single)
61. Row 9 / Column 9 → 8 (Naked Single)
62. Row 8 / Column 5 → 5 (Naked Single)
63. Row 4 / Column 5 → 8 (Naked Single)
64. Row 5 / Column 9 → 2 (Naked Single)
65. Row 2 / Column 9 → 6 (Naked Single)
66. Row 2 / Column 7 → 8 (Full House)
67. Row 8 / Column 9 → 1 (Full House)
68. Row 8 / Column 7 → 6 (Full House)
69. Row 7 / Column 7 → 2 (Naked Single)
70. Row 9 / Column 4 → 1 (Naked Single)
71. Row 9 / Column 8 → 9 (Full House)
72. Row 7 / Column 8 → 5 (Full House)
73. Row 5 / Column 8 → 1 (Full House)
74. Row 6 / Column 5 → 6 (Naked Single)
75. Row 3 / Column 5 → 9 (Full House)
76. Row 4 / Column 3 → 2 (Naked Single)
77. Row 4 / Column 7 → 7 (Full House)
78. Row 5 / Column 3 → 8 (Full House)
79. Row 6 / Column 7 → 5 (Full House)
80. Row 6 / Column 4 → 7 (Full House)
81. Row 5 / Column 4 → 9 (Naked Single)
82. Row 5 / Column 6 → 5 (Full House)
83. Row 3 / Column 6 → 8 (Naked Single)
84. Row 3 / Column 4 → 6 (Full House)
85. Row 1 / Column 4 → 5 (Naked Single)
86. Row 7 / Column 4 → 8 (Full House)
87. Row 1 / Column 6 → 7 (Full House)
88. Row 7 / Column 6 → 9 (Full House)