Solution for Hard Sudoku #2118295473698
8
3
5
4
9
7
2
1
6
6
2
9
3
5
1
8
7
4
1
7
4
6
8
2
5
9
3
9
8
1
5
2
4
6
7
3
2
6
7
9
1
3
5
4
8
4
3
5
7
6
8
2
1
9
7
4
8
1
6
9
3
5
2
1
3
2
4
8
5
7
9
6
9
5
6
3
2
7
8
4
1
This Sudoku Puzzle has 63 steps and it is solved using Naked Single, Full House, Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), undefined, Turbot Fish techniques.
Naked Single
Explanation
Hidden Single
Explanation
Locked Candidates
Explanation
Locked Candidates
Explanation
Full House
Explanation
Solution Steps:
- Row 6 / Column 9 → 9 (Naked Single)
- Row 6 / Column 8 → 1 (Naked Single)
- Row 6 / Column 4 → 5 (Naked Single)
- Row 6 / Column 7 → 2 (Naked Single)
- Row 6 / Column 3 → 3 (Full House)
- Row 5 / Column 6 → 3 (Hidden Single)
- Row 7 / Column 4 → 1 (Hidden Single)
- Row 8 / Column 2 → 6 (Hidden Single)
- Row 5 / Column 5 → 1 (Hidden Single)
- Row 1 / Column 7 → 1 (Hidden Single)
- Row 4 / Column 3 → 1 (Hidden Single)
- Row 3 / Column 7 → 5 (Hidden Single)
- Row 1 / Column 2 → 3 (Hidden Single)
- Row 9 / Column 1 → 3 (Hidden Single)
- Row 3 / Column 9 → 3 (Hidden Single)
- Row 8 / Column 7 → 3 (Hidden Single)
- Locked Candidates Type 1 (Pointing): 6 in b2 => r1c8<>6
- Locked Candidates Type 1 (Pointing): 9 in b7 => r5c3<>9
- Locked Candidates Type 1 (Pointing): 4 in b9 => r9c23<>4
- Locked Candidates Type 2 (Claiming): 8 in r7 => r89c3,r9c2<>8
- 2-String Kite: 7 in r4c7,r9c4 (connected by r4c6,r5c4) => r9c7<>7
- Turbot Fish: 7 r5c4 =7= r9c4 -7- r9c8 =7= r8c9 => r5c9<>7
- XY-Wing: 7/8/4 in r18c9,r9c7 => r2c7<>4
- XY-Wing: 4/9/7 in r4c16,r7c1 => r7c6<>7
- Row 7 / Column 6 → 2 (Naked Single)
- Row 1 / Column 5 → 2 (Hidden Single)
- Row 1 / Column 3 → 5 (Hidden Single)
- Row 2 / Column 5 → 5 (Hidden Single)
- Row 5 / Column 1 → 5 (Hidden Single)
- Row 9 / Column 2 → 5 (Hidden Single)
- Row 3 / Column 4 → 8 (Hidden Single)
- Row 5 / Column 4 → 9 (Hidden Single)
- Row 4 / Column 6 → 7 (Full House)
- Row 1 / Column 4 → 6 (Naked Single)
- Row 9 / Column 4 → 7 (Full House)
- Row 4 / Column 1 → 9 (Hidden Single)
- Row 9 / Column 3 → 2 (Hidden Single)
- Row 5 / Column 2 → 2 (Hidden Single)
- Row 9 / Column 6 → 6 (Hidden Single)
- Row 8 / Column 9 → 7 (Hidden Single)
- Row 1 / Column 9 → 4 (Naked Single)
- Row 5 / Column 9 → 8 (Full House)
- Row 8 / Column 3 → 9 (Naked Single)
- Row 8 / Column 5 → 8 (Full House)
- Row 9 / Column 5 → 9 (Full House)
- Row 1 / Column 6 → 9 (Naked Single)
- Row 1 / Column 8 → 7 (Full House)
- Row 3 / Column 6 → 4 (Full House)
- Row 3 / Column 8 → 9 (Full House)
- Row 4 / Column 7 → 4 (Naked Single)
- Row 4 / Column 2 → 8 (Full House)
- Row 5 / Column 3 → 4 (Full House)
- Row 7 / Column 2 → 4 (Full House)
- Row 5 / Column 8 → 6 (Naked Single)
- Row 5 / Column 7 → 7 (Full House)
- Row 9 / Column 7 → 8 (Naked Single)
- Row 2 / Column 7 → 6 (Full House)
- Row 2 / Column 8 → 8 (Full House)
- Row 9 / Column 8 → 4 (Full House)
- Row 2 / Column 3 → 7 (Naked Single)
- Row 2 / Column 1 → 4 (Full House)
- Row 7 / Column 1 → 7 (Full House)
- Row 7 / Column 3 → 8 (Full House)
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