Solution for Hard Sudoku #3112876943518
8
6
1
7
2
3
9
4
5
2
5
4
9
6
8
3
1
7
3
9
7
1
4
5
6
8
2
1
3
8
4
5
7
6
9
2
4
7
2
6
9
1
8
3
5
9
5
6
2
3
8
4
7
1
2
8
6
3
1
9
5
7
4
7
4
3
5
8
6
1
2
9
5
1
9
7
2
4
8
6
3
This Sudoku Puzzle has 61 steps and it is solved using Hidden Single, Locked Triple, Naked Single, Locked Candidates Type 1 (Pointing), Naked Pair, undefined, Skyscraper, Full House techniques.
Naked Single
Explanation
Hidden Single
Explanation
Locked Candidates
Explanation
Full House
Explanation
Solution Steps:
- Row 8 / Column 8 → 2 (Hidden Single)
- Locked Triple: 2,7,8 in r456c3 => r3c3,r5c1<>7, r37c3,r46c2,r5c1<>8, r46c2<>2
- Row 5 / Column 1 → 4 (Naked Single)
- Row 5 / Column 7 → 2 (Naked Single)
- Locked Candidates Type 1 (Pointing): 3 in b4 => r8c2<>3
- Locked Candidates Type 1 (Pointing): 9 in b4 => r23c2<>9
- Locked Candidates Type 1 (Pointing): 9 in b6 => r7c7<>9
- Naked Pair: 7,8 in r5c39 => r5c46<>7, r5c4<>8
- X-Wing: 6 c37 r37 => r3c2568,r7c2458<>6
- Skyscraper: 6 in r8c5,r9c8 (connected by r2c58) => r9c46<>6
- Row 9 / Column 8 → 6 (Hidden Single)
- Row 3 / Column 7 → 6 (Hidden Single)
- Row 3 / Column 3 → 5 (Naked Single)
- Row 7 / Column 3 → 6 (Naked Single)
- Row 7 / Column 8 → 1 (Hidden Single)
- Row 7 / Column 2 → 8 (Naked Single)
- Row 3 / Column 2 → 4 (Naked Single)
- Row 8 / Column 1 → 3 (Naked Single)
- Row 8 / Column 2 → 1 (Naked Single)
- Row 9 / Column 1 → 5 (Full House)
- Row 8 / Column 9 → 4 (Naked Single)
- Row 7 / Column 7 → 5 (Naked Single)
- Row 8 / Column 6 → 6 (Naked Single)
- Row 8 / Column 5 → 8 (Full House)
- Row 4 / Column 7 → 9 (Naked Single)
- Row 6 / Column 7 → 4 (Full House)
- Row 7 / Column 9 → 9 (Naked Single)
- Row 9 / Column 9 → 3 (Full House)
- Row 5 / Column 6 → 1 (Naked Single)
- Row 4 / Column 2 → 3 (Naked Single)
- Row 7 / Column 4 → 7 (Naked Single)
- Row 7 / Column 5 → 4 (Full House)
- Row 5 / Column 4 → 6 (Naked Single)
- Row 9 / Column 6 → 9 (Naked Single)
- Row 9 / Column 4 → 1 (Full House)
- Row 4 / Column 5 → 7 (Naked Single)
- Row 6 / Column 2 → 9 (Naked Single)
- Row 1 / Column 4 → 2 (Naked Single)
- Row 3 / Column 6 → 7 (Naked Single)
- Row 2 / Column 5 → 6 (Naked Single)
- Row 3 / Column 5 → 1 (Naked Single)
- Row 6 / Column 5 → 3 (Full House)
- Row 4 / Column 6 → 2 (Naked Single)
- Row 6 / Column 4 → 8 (Full House)
- Row 2 / Column 4 → 9 (Full House)
- Row 1 / Column 6 → 4 (Full House)
- Row 1 / Column 2 → 6 (Naked Single)
- Row 2 / Column 2 → 2 (Full House)
- Row 3 / Column 8 → 8 (Naked Single)
- Row 3 / Column 1 → 9 (Full House)
- Row 4 / Column 3 → 8 (Naked Single)
- Row 4 / Column 8 → 5 (Full House)
- Row 6 / Column 8 → 7 (Naked Single)
- Row 2 / Column 8 → 4 (Full House)
- Row 5 / Column 9 → 8 (Full House)
- Row 5 / Column 3 → 7 (Full House)
- Row 6 / Column 3 → 2 (Full House)
- Row 2 / Column 1 → 7 (Naked Single)
- Row 1 / Column 1 → 8 (Full House)
- Row 1 / Column 9 → 7 (Full House)
- Row 2 / Column 9 → 5 (Full House)
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