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

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

Try To Solve This Puzzle

## Solution Steps:

1. Row 1 / Column 5 → 2 (Hidden Single)
2. Row 6 / Column 4 → 1 (Hidden Single)
3. Row 9 / Column 1 → 1 (Hidden Single)
4. Row 5 / Column 7 → 1 (Hidden Single)
5. Row 7 / Column 4 → 2 (Hidden Single)
6. Row 9 / Column 9 → 2 (Hidden Single)
7. Row 2 / Column 5 → 1 (Hidden Single)
8. Locked Candidates Type 1 (Pointing): 4 in b1 => r56c3<>4
9. Row 5 / Column 5 → 4 (Hidden Single)
10. Row 3 / Column 3 → 4 (Hidden Single)
11. Row 1 / Column 6 → 4 (Hidden Single)
12. Row 7 / Column 5 → 9 (Hidden Single)
13. Row 8 / Column 2 → 9 (Hidden Single)
14. Locked Candidates Type 1 (Pointing): 7 in b1 => r7c1<>7
15. Locked Candidates Type 1 (Pointing): 3 in b2 => r2c128<>3
16. Locked Candidates Type 1 (Pointing): 3 in b3 => r7c9<>3
17. Locked Candidates Type 2 (Claiming): 3 in c2 => r7c13,r9c3<>3
18. XYZ-Wing: 6/7/8 in r2c8,r3c57 => r3c9<>6
19. Grouped AIC: 8 8- r7c9 -6- r7c123 =6= r9c23 -6- r9c5 -8- r8c46 =8= r8c7 -8 => r79c7<>8
20. Grouped Discontinuous Nice Loop: 6 r3c1 -6- r3c5 =6= r2c46 -6- r2c8 -7- r2c1 =7= r3c1 => r3c1<>6
21. Grouped AIC: 6 6- r3c7 =6= r3c5 =8= r9c5 -8- r8c46 =8= r8c7 -8- r7c9 -6 => r1c9,r789c7<>6
22. Discontinuous Nice Loop: 6 r7c3 -6- r7c9 -8- r8c7 -7- r8c6 =7= r9c6 -7- r9c3 =7= r7c3 => r7c3<>6
23. Discontinuous Nice Loop: 6 r7c8 -6- r7c9 -8- r8c7 -7- r8c6 =7= r9c6 =3= r9c2 -3- r7c2 =3= r7c8 => r7c8<>6
24. Grouped Discontinuous Nice Loop: 6 r1c7 -6- r3c7 =6= r3c5 =8= r9c5 -8- r8c46 =8= r8c7 -8- r7c9 -6- r5c9 -9- r1c9 =9= r1c7 => r1c7<>6
25. Locked Candidates Type 2 (Claiming): 6 in r1 => r2c12<>6
26. Naked Triple: 3,8,9 in r1c79,r3c9 => r3c7<>8
27. Grouped AIC: 6 6- r2c8 =6= r3c7 -6- r3c5 =6= r9c5 -6- r8c46 =6= r8c8 -6 => r46c8<>6
28. Locked Pair: 2,4 in r46c8 => r4c7,r7c8<>4
29. Row 7 / Column 7 → 4 (Hidden Single)
30. Row 9 / Column 7 → 5 (Hidden Single)
31. AIC: 6 6- r2c8 -7- r7c8 =7= r7c3 =5= r5c3 -5- r5c4 -6- r5c9 =6= r4c7 -6- r3c7 =6= r3c5 -6 => r2c46,r3c7<>6
32. Row 3 / Column 7 → 7 (Naked Single)
33. Row 2 / Column 8 → 6 (Naked Single)
34. Row 8 / Column 7 → 8 (Naked Single)
35. Row 1 / Column 7 → 9 (Naked Single)
36. Row 4 / Column 7 → 6 (Full House)
37. Row 7 / Column 9 → 6 (Naked Single)
38. Row 5 / Column 9 → 9 (Naked Single)
39. Row 3 / Column 5 → 6 (Hidden Single)
40. Row 9 / Column 5 → 8 (Full House)
41. Row 2 / Column 1 → 7 (Hidden Single)
42. Row 2 / Column 2 → 5 (Hidden Single)
43. Locked Candidates Type 1 (Pointing): 6 in b7 => r9c6<>6
44. Naked Triple: 4,6,8 in r46c2,r6c3 => r46c1<>8, r5c13,r6c1<>6
45. Row 5 / Column 4 → 6 (Hidden Single)
46. Row 8 / Column 4 → 3 (Naked Single)
47. Row 2 / Column 4 → 8 (Naked Single)
48. Row 2 / Column 6 → 3 (Full House)
49. Row 4 / Column 4 → 5 (Full House)
50. Row 8 / Column 8 → 7 (Naked Single)
51. Row 7 / Column 8 → 3 (Full House)
52. Row 8 / Column 6 → 6 (Full House)
53. Row 9 / Column 6 → 7 (Full House)
54. Row 7 / Column 2 → 8 (Naked Single)
55. Row 9 / Column 3 → 6 (Naked Single)
56. Row 9 / Column 2 → 3 (Full House)
57. Row 4 / Column 2 → 4 (Naked Single)
58. Row 6 / Column 2 → 6 (Full House)
59. Row 7 / Column 1 → 5 (Naked Single)
60. Row 7 / Column 3 → 7 (Full House)
61. Row 6 / Column 3 → 8 (Naked Single)
62. Row 4 / Column 8 → 2 (Naked Single)
63. Row 6 / Column 8 → 4 (Full House)
64. Row 5 / Column 1 → 3 (Naked Single)
65. Row 5 / Column 3 → 5 (Full House)
66. Row 1 / Column 3 → 3 (Full House)
67. Row 6 / Column 6 → 9 (Naked Single)
68. Row 4 / Column 6 → 8 (Full House)
69. Row 4 / Column 1 → 9 (Full House)
70. Row 6 / Column 1 → 2 (Full House)
71. Row 3 / Column 1 → 8 (Naked Single)
72. Row 1 / Column 1 → 6 (Full House)
73. Row 1 / Column 9 → 8 (Full House)
74. Row 3 / Column 9 → 3 (Full House)