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

This Sudoku Puzzle has 74 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), undefined, Continuous Nice Loop, Sue de Coq, Discontinuous Nice Loop, Naked Single, Full House techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 6 / Column 9 → 1 (Hidden Single)
2. Row 4 / Column 4 → 3 (Hidden Single)
3. Row 4 / Column 3 → 7 (Hidden Single)
4. Row 8 / Column 4 → 7 (Hidden Single)
5. Row 5 / Column 5 → 7 (Hidden Single)
6. Row 9 / Column 9 → 7 (Hidden Single)
7. Row 6 / Column 5 → 2 (Hidden Single)
8. Row 3 / Column 5 → 4 (Hidden Single)
9. Row 2 / Column 8 → 4 (Hidden Single)
10. Row 2 / Column 6 → 1 (Hidden Single)
11. Row 1 / Column 9 → 2 (Hidden Single)
12. Row 2 / Column 1 → 7 (Hidden Single)
13. Row 3 / Column 8 → 7 (Hidden Single)
14. Locked Candidates Type 1 (Pointing): 5 in b6 => r78c8<>5
15. Locked Candidates Type 1 (Pointing): 8 in b8 => r1c5<>8
16. Locked Candidates Type 2 (Claiming): 9 in r9 => r7c13,r8c12<>9
17. 2-String Kite: 4 in r5c7,r8c1 (connected by r8c9,r9c7) => r5c1<>4
18. Locked Candidates Type 1 (Pointing): 4 in b4 => r9c3<>4
19. XYZ-Wing: 2/6/8 in r2c23,r4c2 => r3c2<>8
20. Continuous Nice Loop: 1/5/6/8/9 3= r3c2 =1= r3c3 -1- r7c3 =1= r7c5 =6= r1c5 -6- r2c4 =6= r2c2 =2= r8c2 =3= r3c2 =1 => r9c3<>1, r7c5<>5, r3c24<>6, r28c2,r7c5<>8, r3c2<>9
21. XY-Wing: 2/6/8 in r2c23,r4c2 => r6c3<>8
22. Locked Candidates Type 1 (Pointing): 8 in b4 => r9c2<>8
23. Sue de Coq: r89c2 - {1239} (r3c2 - {13}, r789c1,r9c3 - {24589}) => r7c3<>2, r7c3<>5, r7c3<>8
24. XY-Chain: 5 5- r4c8 -8- r4c2 -6- r2c2 -2- r2c3 -8- r2c4 -6- r6c4 -5 => r4c6,r6c8<>5
25. Row 4 / Column 8 → 5 (Hidden Single)
26. Discontinuous Nice Loop: 8 r3c1 -8- r3c4 -5- r1c5 -6- r7c5 -1- r7c3 =1= r3c3 =9= r3c1 => r3c1<>8
27. Discontinuous Nice Loop: 8 r3c3 -8- r3c4 -5- r1c5 -6- r7c5 -1- r7c3 =1= r3c3 => r3c3<>8
28. Discontinuous Nice Loop: 6 r4c6 -6- r6c4 =6= r2c4 =8= r2c3 =2= r5c3 =4= r6c3 -4- r6c6 =4= r4c6 => r4c6<>6
29. Row 4 / Column 6 → 4 (Naked Single)
30. Row 6 / Column 3 → 4 (Hidden Single)
31. Locked Candidates Type 1 (Pointing): 6 in b5 => r6c2<>6
32. XY-Chain: 9 9- r5c3 -2- r2c3 -8- r2c4 -6- r2c2 -2- r8c2 -3- r3c2 -1- r9c2 -9- r6c2 -8- r6c8 -9 => r5c89,r6c2<>9
33. Row 5 / Column 8 → 3 (Naked Single)
34. Row 6 / Column 2 → 8 (Naked Single)
35. Row 4 / Column 2 → 6 (Naked Single)
36. Row 4 / Column 9 → 8 (Full House)
37. Row 6 / Column 8 → 9 (Naked Single)
38. Row 2 / Column 2 → 2 (Naked Single)
39. Row 2 / Column 3 → 8 (Naked Single)
40. Row 2 / Column 4 → 6 (Full House)
41. Row 8 / Column 2 → 3 (Naked Single)
42. Row 1 / Column 5 → 5 (Naked Single)
43. Row 3 / Column 4 → 8 (Full House)
44. Row 6 / Column 4 → 5 (Full House)
45. Row 6 / Column 6 → 6 (Full House)
46. Row 3 / Column 2 → 1 (Naked Single)
47. Row 9 / Column 2 → 9 (Full House)
48. Row 7 / Column 3 → 1 (Naked Single)
49. Row 1 / Column 1 → 6 (Naked Single)
50. Row 1 / Column 3 → 3 (Naked Single)
51. Row 1 / Column 7 → 8 (Full House)
52. Row 8 / Column 5 → 8 (Naked Single)
53. Row 9 / Column 3 → 5 (Naked Single)
54. Row 7 / Column 5 → 6 (Naked Single)
55. Row 9 / Column 5 → 1 (Full House)
56. Row 8 / Column 8 → 2 (Naked Single)
57. Row 7 / Column 8 → 8 (Full House)
58. Row 3 / Column 3 → 9 (Naked Single)
59. Row 3 / Column 1 → 5 (Full House)
60. Row 5 / Column 3 → 2 (Full House)
61. Row 5 / Column 1 → 9 (Full House)
62. Row 9 / Column 7 → 4 (Naked Single)
63. Row 9 / Column 1 → 8 (Full House)
64. Row 8 / Column 1 → 4 (Naked Single)
65. Row 7 / Column 1 → 2 (Full House)
66. Row 5 / Column 7 → 6 (Naked Single)
67. Row 5 / Column 9 → 4 (Full House)
68. Row 8 / Column 9 → 9 (Naked Single)
69. Row 8 / Column 6 → 5 (Full House)
70. Row 7 / Column 6 → 9 (Full House)
71. Row 3 / Column 7 → 3 (Naked Single)
72. Row 3 / Column 9 → 6 (Full House)
73. Row 7 / Column 9 → 3 (Full House)
74. Row 7 / Column 7 → 5 (Full House)