Solution for Hard Sudoku #3248752163918
5
9
8
1
6
7
3
4
2
2
7
4
9
3
5
1
8
6
1
6
3
4
8
2
9
5
7
6
7
5
9
2
4
8
1
3
8
4
9
5
1
3
6
2
7
3
2
1
6
7
8
5
9
4
4
3
9
2
8
6
7
5
1
7
5
8
3
9
1
4
6
2
2
1
6
7
4
5
8
3
9
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 2 / Column 8 → 8 (Hidden Single)
- Locked Triple: 5,7,8 in r7c456 => r7c3,r9c5<>5, r7c37,r8c46,r9c5<>7, r8c46<>8
- Row 9 / Column 5 → 6 (Naked Single)
- Row 3 / Column 5 → 8 (Naked Single)
- Locked Candidates Type 1 (Pointing): 1 in b2 => r3c7<>1
- Locked Candidates Type 1 (Pointing): 1 in b8 => r8c23<>1
- Locked Candidates Type 1 (Pointing): 3 in b8 => r8c8<>3
- Naked Pair: 5,7 in r17c5 => r46c5<>5, r6c5<>7
- X-Wing: 2 r37 c37 => r2c37,r458c3,r568c7<>2
- Skyscraper: 2 in r2c9,r5c8 (connected by r25c2) => r46c9<>2
- Row 2 / Column 9 → 2 (Hidden Single)
- Row 3 / Column 3 → 2 (Hidden Single)
- Row 7 / Column 3 → 9 (Naked Single)
- Row 7 / Column 7 → 2 (Naked Single)
- Row 2 / Column 7 → 4 (Hidden Single)
- Row 8 / Column 7 → 7 (Naked Single)
- Row 8 / Column 3 → 6 (Naked Single)
- Row 8 / Column 8 → 4 (Naked Single)
- Row 9 / Column 8 → 3 (Naked Single)
- Row 9 / Column 9 → 9 (Full House)
- Row 1 / Column 8 → 6 (Naked Single)
- Row 3 / Column 7 → 9 (Naked Single)
- Row 4 / Column 8 → 2 (Naked Single)
- Row 5 / Column 8 → 7 (Full House)
- Row 1 / Column 7 → 1 (Naked Single)
- Row 1 / Column 9 → 3 (Full House)
- Row 3 / Column 4 → 1 (Naked Single)
- Row 3 / Column 6 → 6 (Full House)
- Row 4 / Column 5 → 4 (Naked Single)
- Row 6 / Column 7 → 5 (Naked Single)
- Row 5 / Column 7 → 6 (Full House)
- Row 8 / Column 4 → 3 (Naked Single)
- Row 4 / Column 9 → 1 (Naked Single)
- Row 6 / Column 9 → 4 (Full House)
- Row 6 / Column 5 → 2 (Naked Single)
- Row 5 / Column 4 → 5 (Naked Single)
- Row 8 / Column 6 → 1 (Naked Single)
- Row 4 / Column 3 → 5 (Naked Single)
- Row 6 / Column 1 → 8 (Naked Single)
- Row 4 / Column 4 → 8 (Naked Single)
- Row 4 / Column 1 → 6 (Full House)
- Row 5 / Column 2 → 2 (Naked Single)
- Row 5 / Column 3 → 4 (Naked Single)
- Row 5 / Column 6 → 3 (Full House)
- Row 6 / Column 2 → 1 (Full House)
- Row 6 / Column 6 → 7 (Full House)
- Row 2 / Column 3 → 7 (Naked Single)
- Row 9 / Column 3 → 1 (Full House)
- Row 8 / Column 1 → 2 (Naked Single)
- Row 8 / Column 2 → 8 (Full House)
- Row 7 / Column 4 → 7 (Naked Single)
- Row 2 / Column 4 → 9 (Full House)
- Row 9 / Column 2 → 5 (Naked Single)
- Row 9 / Column 1 → 7 (Full House)
- Row 1 / Column 1 → 5 (Full House)
- Row 2 / Column 6 → 5 (Naked Single)
- Row 2 / Column 2 → 6 (Full House)
- Row 1 / Column 2 → 9 (Full House)
- Row 1 / Column 5 → 7 (Full House)
- Row 7 / Column 5 → 5 (Full House)
- Row 7 / Column 6 → 8 (Full House)
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