Solution for Hard Sudoku #2173542168998
3
8
2
1
4
6
5
7
9
9
5
4
8
2
7
3
6
1
7
6
1
9
3
5
2
4
8
4
3
7
2
5
1
9
6
8
5
9
6
4
7
8
2
1
3
1
8
2
6
9
3
5
7
4
6
1
3
7
9
4
8
2
5
7
8
5
1
3
2
6
4
9
4
2
9
8
5
6
3
1
7
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 → 4 (Naked Single)
- Row 6 / Column 8 → 7 (Naked Single)
- Row 6 / Column 4 → 2 (Naked Single)
- Row 6 / Column 7 → 5 (Naked Single)
- Row 6 / Column 3 → 8 (Full House)
- Row 5 / Column 6 → 8 (Hidden Single)
- Row 7 / Column 4 → 7 (Hidden Single)
- Row 8 / Column 2 → 9 (Hidden Single)
- Row 5 / Column 5 → 7 (Hidden Single)
- Row 1 / Column 7 → 7 (Hidden Single)
- Row 4 / Column 3 → 7 (Hidden Single)
- Row 3 / Column 7 → 2 (Hidden Single)
- Row 1 / Column 2 → 8 (Hidden Single)
- Row 9 / Column 1 → 8 (Hidden Single)
- Row 3 / Column 9 → 8 (Hidden Single)
- Row 8 / Column 7 → 8 (Hidden Single)
- Locked Candidates Type 1 (Pointing): 9 in b2 => r1c8<>9
- Locked Candidates Type 1 (Pointing): 4 in b7 => r5c3<>4
- Locked Candidates Type 1 (Pointing): 1 in b9 => r9c23<>1
- Locked Candidates Type 2 (Claiming): 3 in r7 => r89c3,r9c2<>3
- 2-String Kite: 6 in r4c7,r9c4 (connected by r4c6,r5c4) => r9c7<>6
- Turbot Fish: 6 r5c4 =6= r9c4 -6- r9c8 =6= r8c9 => r5c9<>6
- XY-Wing: 3/6/1 in r18c9,r9c7 => r2c7<>1
- XY-Wing: 1/4/6 in r4c16,r7c1 => r7c6<>6
- Row 7 / Column 6 → 5 (Naked Single)
- Row 1 / Column 5 → 5 (Hidden Single)
- Row 1 / Column 3 → 2 (Hidden Single)
- Row 2 / Column 5 → 2 (Hidden Single)
- Row 5 / Column 1 → 2 (Hidden Single)
- Row 9 / Column 2 → 2 (Hidden Single)
- Row 3 / Column 4 → 3 (Hidden Single)
- Row 5 / Column 4 → 4 (Hidden Single)
- Row 4 / Column 6 → 6 (Full House)
- Row 1 / Column 4 → 9 (Naked Single)
- Row 9 / Column 4 → 6 (Full House)
- Row 4 / Column 1 → 4 (Hidden Single)
- Row 9 / Column 3 → 5 (Hidden Single)
- Row 5 / Column 2 → 5 (Hidden Single)
- Row 9 / Column 6 → 9 (Hidden Single)
- Row 8 / Column 9 → 6 (Hidden Single)
- Row 1 / Column 9 → 1 (Naked Single)
- Row 5 / Column 9 → 3 (Full House)
- Row 8 / Column 3 → 4 (Naked Single)
- Row 8 / Column 5 → 3 (Full House)
- Row 9 / Column 5 → 4 (Full House)
- Row 1 / Column 6 → 4 (Naked Single)
- Row 1 / Column 8 → 6 (Full House)
- Row 3 / Column 6 → 1 (Full House)
- Row 3 / Column 8 → 4 (Full House)
- Row 4 / Column 7 → 1 (Naked Single)
- Row 4 / Column 2 → 3 (Full House)
- Row 5 / Column 3 → 1 (Full House)
- Row 7 / Column 2 → 1 (Full House)
- Row 5 / Column 8 → 9 (Naked Single)
- Row 5 / Column 7 → 6 (Full House)
- Row 9 / Column 7 → 3 (Naked Single)
- Row 2 / Column 7 → 9 (Full House)
- Row 2 / Column 8 → 3 (Full House)
- Row 9 / Column 8 → 1 (Full House)
- Row 2 / Column 3 → 6 (Naked Single)
- Row 2 / Column 1 → 1 (Full House)
- Row 7 / Column 1 → 6 (Full House)
- Row 7 / Column 3 → 3 (Full House)
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