5
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9
2
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9
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9
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1

This Sudoku Puzzle has 51 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Pair, Naked Single, Full House, Naked Pair, Uniqueness Test 1, Uniqueness Test 2, Hidden Rectangle, AIC, Uniqueness Test 4, undefined, Give Up techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 5 / Column 6 → 9 (Hidden Single)
2. Row 4 / Column 3 → 6 (Hidden Single)
3. Row 3 / Column 4 → 6 (Hidden Single)
4. Row 3 / Column 2 → 7 (Hidden Single)
5. Row 9 / Column 1 → 6 (Hidden Single)
6. Row 1 / Column 7 → 1 (Hidden Single)
7. Row 7 / Column 9 → 4 (Hidden Single)
8. Row 5 / Column 1 → 5 (Hidden Single)
9. Row 5 / Column 2 → 4 (Hidden Single)
10. Row 9 / Column 3 → 4 (Hidden Single)
11. Row 8 / Column 3 → 5 (Hidden Single)
12. Locked Candidates Type 1 (Pointing): 1 in b1 => r7c3<>1
13. Locked Candidates Type 1 (Pointing): 3 in b1 => r7c1<>3
14. Locked Candidates Type 1 (Pointing): 9 in b1 => r7c3<>9
15. Locked Pair: 2,8 in r7c13 => r7c247,r89c2<>2, r7c245,r89c2<>8
16. Row 9 / Column 2 → 9 (Naked Single)
17. Locked Candidates Type 1 (Pointing): 3 in b3 => r6c9<>3
18. Locked Candidates Type 1 (Pointing): 5 in b3 => r6c9<>5
19. Locked Candidates Type 1 (Pointing): 9 in b3 => r8c8<>9
20. Locked Candidates Type 1 (Pointing): 7 in b9 => r5c7<>7
21. Row 5 / Column 7 → 2 (Naked Single)
22. Row 5 / Column 4 → 8 (Naked Single)
23. Row 5 / Column 9 → 7 (Full House)
24. Row 9 / Column 7 → 7 (Naked Single)
25. Row 7 / Column 7 → 9 (Naked Single)
26. Row 8 / Column 7 → 6 (Naked Single)
27. Row 8 / Column 5 → 9 (Hidden Single)
28. Locked Candidates Type 1 (Pointing): 2 in b9 => r8c6<>2
29. Locked Candidates Type 1 (Pointing): 8 in b9 => r8c6<>8
30. Naked Pair: 2,8 in r17c3 => r2c3<>8, r3c3<>2
31. Uniqueness Test 1: 2/8 in r1c13,r7c13 => r1c1<>2, r1c1<>8
32. Uniqueness Test 2: 3/5 in r4c57,r6c57 => r13c5,r6c6<>4
33. Hidden Rectangle: 3/4 in r1c16,r3c16 => r3c6<>3
34. AIC: 2 2- r1c3 -8- r2c1 =8= r2c6 =1= r2c3 =9= r2c8 -9- r3c8 -2 => r1c89,r3c1<>2
35. Row 1 / Column 3 → 2 (Hidden Single)
36. Row 7 / Column 3 → 8 (Naked Single)
37. Row 7 / Column 1 → 2 (Naked Single)
38. Row 2 / Column 1 → 8 (Hidden Single)
39. Uniqueness Test 4: 3/4 in r1c16,r3c16 => r1c6<>3
40. AIC: 4 4- r1c1 -3- r1c9 -6- r6c9 -8- r6c2 -2- r6c6 =2= r9c6 =8= r1c6 =4= r3c6 -4 => r1c6,r3c1<>4
41. Row 1 / Column 6 → 8 (Naked Single)
42. Row 3 / Column 1 → 3 (Naked Single)
43. Row 1 / Column 1 → 4 (Full House)
44. Row 3 / Column 6 → 4 (Hidden Single)
45. Row 9 / Column 5 → 8 (Hidden Single)
46. XYZ-Wing: 3/5/7 in r1c5,r2c49 => r2c6<>3
47. Naked Pair: 1,5 in r2c6,r3c5 => r2c4<>5
48. Naked Pair: 3,7 in r27c4 => r4c4<>3
49. XYZ-Wing: 2/3/5 in r4c4,r6c67 => r6c5<>5
50. XY-Chain: 3 3- r1c5 -7- r2c4 -3- r2c9 -5- r2c6 -1- r8c6 -3 => r7c5<>3
51. Give Up: Don't know how to proceed!