Solution for Hard Sudoku #1231475298698
3
6
4
5
7
5
8
4
5
8
2
1
2
6
4
3
9
8
3
9
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7
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 1 / Column 4 → 7 (Naked Single)
- Row 2 / Column 4 → 3 (Naked Single)
- Row 3 / Column 4 → 4 (Naked Single)
- Row 6 / Column 4 → 5 (Naked Single)
- Row 7 / Column 4 → 8 (Full House)
- Row 4 / Column 5 → 8 (Hidden Single)
- Row 5 / Column 5 → 3 (Hidden Single)
- Row 6 / Column 3 → 3 (Hidden Single)
- Row 8 / Column 2 → 6 (Hidden Single)
- Row 3 / Column 9 → 3 (Hidden Single)
- Row 7 / Column 6 → 3 (Hidden Single)
- Row 3 / Column 7 → 5 (Hidden Single)
- Row 8 / Column 9 → 8 (Hidden Single)
- Row 9 / Column 1 → 8 (Hidden Single)
- Row 1 / Column 7 → 8 (Hidden Single)
- Row 3 / Column 2 → 8 (Hidden Single)
- Locked Candidates Type 1 (Pointing): 2 in b1 => r78c1<>2
- Locked Candidates Type 1 (Pointing): 6 in b6 => r2c9<>6
- Locked Candidates Type 1 (Pointing): 7 in b7 => r7c5<>7
- Locked Candidates Type 2 (Claiming): 1 in c3 => r7c12,r8c1<>1
- 2-String Kite: 9 in r3c6,r6c1 (connected by r4c6,r6c5) => r3c1<>9
- Turbot Fish: 9 r1c2 =9= r2c1 -9- r6c1 =9= r6c5 => r1c5<>9
- XY-Wing: 1/9/2 in r1c29,r3c1 => r3c8<>2
- XY-Wing: 2/7/9 in r49c6,r9c3 => r4c3<>9
- Row 4 / Column 3 → 4 (Naked Single)
- Row 5 / Column 9 → 4 (Hidden Single)
- Row 5 / Column 8 → 5 (Hidden Single)
- Row 7 / Column 9 → 5 (Hidden Single)
- Row 9 / Column 5 → 5 (Hidden Single)
- Row 6 / Column 7 → 1 (Hidden Single)
- Row 8 / Column 1 → 5 (Hidden Single)
- Row 9 / Column 6 → 7 (Hidden Single)
- Row 4 / Column 6 → 9 (Naked Single)
- Row 6 / Column 5 → 7 (Full House)
- Row 6 / Column 9 → 6 (Naked Single)
- Row 6 / Column 1 → 9 (Full House)
- Row 8 / Column 5 → 4 (Hidden Single)
- Row 7 / Column 1 → 4 (Hidden Single)
- Row 4 / Column 1 → 6 (Hidden Single)
- Row 1 / Column 2 → 9 (Hidden Single)
- Row 1 / Column 9 → 2 (Naked Single)
- Row 1 / Column 5 → 1 (Full House)
- Row 7 / Column 2 → 7 (Naked Single)
- Row 5 / Column 2 → 1 (Full House)
- Row 5 / Column 1 → 7 (Full House)
- Row 2 / Column 7 → 7 (Naked Single)
- Row 4 / Column 7 → 2 (Full House)
- Row 4 / Column 9 → 7 (Full House)
- Row 2 / Column 9 → 9 (Full House)
- Row 3 / Column 6 → 2 (Naked Single)
- Row 8 / Column 6 → 1 (Full House)
- Row 7 / Column 5 → 2 (Full House)
- Row 8 / Column 3 → 2 (Full House)
- Row 2 / Column 5 → 6 (Naked Single)
- Row 3 / Column 5 → 9 (Full House)
- Row 3 / Column 1 → 1 (Naked Single)
- Row 2 / Column 1 → 2 (Full House)
- Row 2 / Column 8 → 1 (Full House)
- Row 3 / Column 8 → 6 (Full House)
- Row 7 / Column 8 → 9 (Naked Single)
- Row 7 / Column 3 → 1 (Full House)
- Row 9 / Column 3 → 9 (Full House)
- Row 9 / Column 8 → 2 (Full House)
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