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

This Sudoku Puzzle has 66 steps and it is solved using Hidden Single, Naked Triple, Naked Single, Locked Candidates Type 2 (Claiming), Hidden Pair, Uniqueness Test 2, undefined, Finned Swordfish, Locked Pair, Full House techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 2 / Column 4 → 8 (Hidden Single)
2. Naked Triple: 1,6,8 in r9c137 => r9c45<>1, r9c5<>6, r9c9<>8
3. Row 9 / Column 9 → 9 (Naked Single)
4. Row 5 / Column 9 → 8 (Hidden Single)
5. Locked Candidates Type 2 (Claiming): 1 in r9 => r7c3,r8c1<>1
6. Hidden Pair: 1,8 in r49c3 => r4c3<>2, r4c3<>3, r9c3<>6
7. Uniqueness Test 2: 2/4 in r6c45,r9c45 => r4c46,r6c1<>1
8. Row 4 / Column 3 → 1 (Hidden Single)
9. Row 9 / Column 3 → 8 (Naked Single)
10. Row 9 / Column 7 → 6 (Naked Single)
11. Row 9 / Column 1 → 1 (Naked Single)
12. Row 4 / Column 2 → 8 (Hidden Single)
13. Row 8 / Column 7 → 8 (Hidden Single)
14. Finned X-Wing: 5 r28 c18 fr2c7 => r1c8<>5
15. Almost Locked Set XZ-Rule: A=r14679c4 {124579}, B=r1278c6 {12679}, X=9, Z=2 => r3c4<>2
16. Almost Locked Set XZ-Rule: A=r4679c4 {12479}, B=r1278c6 {12679}, X=9, Z=2 => r1c4<>2
17. Almost Locked Set XY-Wing: A=r7c9 {57}, B=r12c8,r23c7,r3c9 {234567}, C=r4578c8 {12457}, X,Y=4,5, Z=7 => r1c9<>7
18. Finned Swordfish: 7 r158 c568 fr1c4 => r2c56,r3c5<>7
19. Locked Pair: 2,6 in r2c56 => r1c6,r2c128,r3c5<>6, r1c6,r2c278,r3c5<>2
20. Row 3 / Column 5 → 9 (Naked Single)
21. Row 1 / Column 8 → 6 (Hidden Single)
22. Row 7 / Column 4 → 9 (Hidden Single)
23. Row 5 / Column 6 → 9 (Hidden Single)
24. Row 3 / Column 7 → 2 (Hidden Single)
25. Row 8 / Column 2 → 9 (Hidden Single)
26. Row 4 / Column 6 → 3 (Hidden Single)
27. Row 4 / Column 7 → 7 (Naked Single)
28. Row 2 / Column 6 → 2 (Hidden Single)
29. Row 2 / Column 5 → 6 (Naked Single)
30. Row 5 / Column 5 → 7 (Hidden Single)
31. Row 8 / Column 5 → 1 (Naked Single)
32. Row 6 / Column 4 → 1 (Hidden Single)
33. Row 7 / Column 8 → 1 (Hidden Single)
34. Row 1 / Column 6 → 1 (Hidden Single)
35. Row 1 / Column 4 → 7 (Hidden Single)
36. Row 3 / Column 4 → 5 (Full House)
37. Locked Pair: 2,4 in r45c8 => r2c8,r6c9<>4
38. Row 1 / Column 9 → 4 (Hidden Single)
39. Row 1 / Column 2 → 2 (Naked Single)
40. Row 1 / Column 3 → 5 (Full House)
41. Row 5 / Column 3 → 2 (Hidden Single)
42. Row 5 / Column 8 → 4 (Naked Single)
43. Row 5 / Column 1 → 3 (Full House)
44. Row 4 / Column 8 → 2 (Naked Single)
45. Row 4 / Column 4 → 4 (Full House)
46. Row 6 / Column 5 → 2 (Full House)
47. Row 9 / Column 4 → 2 (Full House)
48. Row 9 / Column 5 → 4 (Full House)
49. Row 8 / Column 1 → 5 (Hidden Single)
50. Row 8 / Column 8 → 7 (Naked Single)
51. Row 2 / Column 8 → 5 (Full House)
52. Row 7 / Column 9 → 5 (Full House)
53. Row 8 / Column 6 → 6 (Full House)
54. Row 7 / Column 6 → 7 (Full House)
55. Row 2 / Column 7 → 3 (Naked Single)
56. Row 3 / Column 9 → 7 (Full House)
57. Row 6 / Column 9 → 3 (Full House)
58. Row 6 / Column 7 → 5 (Full House)
59. Row 2 / Column 2 → 4 (Naked Single)
60. Row 2 / Column 1 → 7 (Full House)
61. Row 3 / Column 1 → 6 (Naked Single)
62. Row 3 / Column 3 → 3 (Full House)
63. Row 6 / Column 1 → 4 (Full House)
64. Row 6 / Column 2 → 6 (Full House)
65. Row 7 / Column 3 → 6 (Full House)
66. Row 7 / Column 2 → 3 (Full House)