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

This Sudoku Puzzle has 45 steps and it is solved using Naked Single, Full House, Hidden Single, Locked Candidates Type 1 (Pointing), Uniqueness Test 1, Hidden Rectangle, AIC, Naked Triple, Hidden Pair, Uniqueness Test 4, Empty Rectangle, Uniqueness Test 6, Discontinuous Nice Loop, Give Up techniques.

Try To Solve This Puzzle

## Solution Steps:

1. Row 3 / Column 2 → 8 (Naked Single)
2. Row 2 / Column 3 → 4 (Naked Single)
3. Row 2 / Column 2 → 9 (Full House)
4. Row 8 / Column 1 → 2 (Naked Single)
5. Row 4 / Column 1 → 9 (Full House)
6. Row 8 / Column 3 → 8 (Naked Single)
7. Row 8 / Column 9 → 4 (Naked Single)
8. Row 1 / Column 4 → 8 (Hidden Single)
9. Row 5 / Column 4 → 4 (Hidden Single)
10. Row 1 / Column 5 → 6 (Hidden Single)
11. Row 1 / Column 9 → 3 (Naked Single)
12. Row 1 / Column 7 → 9 (Naked Single)
13. Row 1 / Column 8 → 4 (Full House)
14. Row 3 / Column 8 → 6 (Hidden Single)
15. Row 5 / Column 8 → 9 (Hidden Single)
16. Locked Candidates Type 1 (Pointing): 1 in b3 => r56c7<>1
17. Locked Candidates Type 1 (Pointing): 2 in b3 => r57c7<>2
18. Uniqueness Test 1: 1/2 in r2c47,r3c47 => r2c4<>1, r2c4<>2
19. Hidden Rectangle: 1/4 in r7c25,r9c25 => r9c5<>1
20. AIC: 1 1- r2c5 -3- r2c4 =3= r9c4 =2= r3c4 =1= r3c7 -1 => r2c7,r3c4<>1
21. Row 2 / Column 7 → 2 (Naked Single)
22. Row 3 / Column 7 → 1 (Full House)
23. Row 3 / Column 4 → 2 (Full House)
24. Naked Triple: 1,3,4 in r79c5,r9c4 => r79c6<>1
25. Hidden Pair: 1,4 in r7c25 => r7c5<>3
26. Locked Candidates Type 1 (Pointing): 3 in b8 => r9c8<>3
27. Uniqueness Test 1: 2/8 in r7c68,r9c68 => r7c8<>2, r7c8<>8
28. Row 7 / Column 8 → 3 (Naked Single)
29. Uniqueness Test 4: 1/4 in r7c25,r9c25 => r9c2<>1
30. Empty Rectangle: 1 in b5 (r9c34) => r6c3<>1
31. Uniqueness Test 6: 1/3 in r2c45,r9c45 => r2c4,r9c5<>3
32. Row 2 / Column 4 → 5 (Naked Single)
33. Row 9 / Column 5 → 4 (Naked Single)
34. Row 2 / Column 6 → 1 (Naked Single)
35. Row 2 / Column 5 → 3 (Full House)
36. Row 7 / Column 5 → 1 (Full House)
37. Row 8 / Column 4 → 9 (Naked Single)
38. Row 8 / Column 6 → 5 (Full House)
39. Row 9 / Column 2 → 6 (Naked Single)
40. Row 6 / Column 6 → 9 (Naked Single)
41. Row 7 / Column 2 → 4 (Naked Single)
42. Row 9 / Column 3 → 1 (Full House)
43. Row 9 / Column 4 → 3 (Naked Single)
44. Discontinuous Nice Loop: 7 r6c9 -7- r5c7 -3- r5c3 =3= r6c3 =6= r6c9 => r6c9<>7
45. Give Up: Don't know how to proceed!
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