Solution for Hard Sudoku #1356197234818
9
2
4
8
3
5
6
1
7
3
8
6
1
7
2
9
5
4
5
7
1
4
6
9
8
3
2
7
8
2
1
4
6
5
9
3
6
9
3
5
2
7
8
4
1
1
4
5
9
8
3
6
2
7
2
5
8
3
6
9
4
7
1
4
3
9
7
1
8
2
6
5
7
1
6
2
5
4
3
9
8
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 2 → 6 (Hidden Single)
- Locked Triple: 1,6,9 in r456c7 => r37c7,r46c8,r5c9<>1, r3c7,r5c9<>9, r46c8<>6
- Row 5 / Column 9 → 3 (Naked Single)
- Row 5 / Column 3 → 6 (Naked Single)
- Locked Candidates Type 1 (Pointing): 2 in b4 => r7c3<>2
- Locked Candidates Type 1 (Pointing): 2 in b6 => r23c8<>2
- Locked Candidates Type 1 (Pointing): 4 in b6 => r8c8<>4
- Naked Pair: 1,9 in r5c17 => r5c46<>9, r5c6<>1
- X-Wing: 7 c37 r37 => r3c2458,r7c2568<>7
- Skyscraper: 7 in r8c5,r9c2 (connected by r2c25) => r9c46<>7
- Row 9 / Column 2 → 7 (Hidden Single)
- Row 3 / Column 3 → 7 (Hidden Single)
- Row 3 / Column 7 → 8 (Naked Single)
- Row 7 / Column 7 → 7 (Naked Single)
- Row 7 / Column 2 → 5 (Hidden Single)
- Row 7 / Column 8 → 1 (Naked Single)
- Row 3 / Column 8 → 3 (Naked Single)
- Row 8 / Column 8 → 5 (Naked Single)
- Row 8 / Column 9 → 4 (Naked Single)
- Row 9 / Column 9 → 8 (Full House)
- Row 8 / Column 1 → 3 (Naked Single)
- Row 7 / Column 3 → 8 (Naked Single)
- Row 8 / Column 4 → 7 (Naked Single)
- Row 8 / Column 5 → 1 (Full House)
- Row 4 / Column 3 → 2 (Naked Single)
- Row 6 / Column 3 → 3 (Full House)
- Row 7 / Column 1 → 2 (Naked Single)
- Row 9 / Column 1 → 4 (Full House)
- Row 5 / Column 4 → 5 (Naked Single)
- Row 4 / Column 8 → 4 (Naked Single)
- Row 7 / Column 6 → 9 (Naked Single)
- Row 7 / Column 5 → 3 (Full House)
- Row 5 / Column 6 → 7 (Naked Single)
- Row 9 / Column 4 → 2 (Naked Single)
- Row 9 / Column 6 → 5 (Full House)
- Row 4 / Column 5 → 9 (Naked Single)
- Row 6 / Column 8 → 2 (Naked Single)
- Row 1 / Column 6 → 6 (Naked Single)
- Row 3 / Column 4 → 9 (Naked Single)
- Row 2 / Column 5 → 7 (Naked Single)
- Row 3 / Column 5 → 5 (Naked Single)
- Row 6 / Column 5 → 4 (Full House)
- Row 4 / Column 4 → 6 (Naked Single)
- Row 6 / Column 6 → 1 (Full House)
- Row 2 / Column 6 → 2 (Full House)
- Row 1 / Column 4 → 3 (Full House)
- Row 1 / Column 8 → 7 (Naked Single)
- Row 2 / Column 8 → 6 (Full House)
- Row 3 / Column 2 → 1 (Naked Single)
- Row 3 / Column 9 → 2 (Full House)
- Row 4 / Column 7 → 1 (Naked Single)
- Row 4 / Column 2 → 8 (Full House)
- Row 6 / Column 2 → 9 (Naked Single)
- Row 2 / Column 2 → 3 (Full House)
- Row 5 / Column 1 → 1 (Full House)
- Row 5 / Column 7 → 9 (Full House)
- Row 6 / Column 7 → 6 (Full House)
- Row 2 / Column 9 → 9 (Naked Single)
- Row 1 / Column 9 → 1 (Full House)
- Row 1 / Column 1 → 9 (Full House)
- Row 2 / Column 1 → 8 (Full House)
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