Solution for Hard Sudoku #1254921368718
9
2
3
1
4
6
5
8
7
5
6
1
8
7
3
9
2
4
4
8
7
9
5
2
1
3
6
4
3
8
7
1
5
6
9
2
6
1
9
2
3
8
4
5
7
2
7
5
6
9
4
8
1
3
8
5
1
3
6
9
2
7
4
3
4
6
7
8
2
1
9
5
7
2
9
5
4
1
3
6
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 8 → 4 (Hidden Single)
- Locked Triple: 2,4,9 in r3c456 => r1c5,r3c3<>2, r1c5,r2c46,r3c37<>9, r2c46<>4
- Row 1 / Column 5 → 6 (Naked Single)
- Row 7 / Column 5 → 4 (Naked Single)
- Locked Candidates Type 1 (Pointing): 3 in b2 => r2c23<>3
- Locked Candidates Type 1 (Pointing): 8 in b2 => r2c8<>8
- Locked Candidates Type 1 (Pointing): 3 in b8 => r7c7<>3
- Naked Pair: 2,9 in r39c5 => r46c5<>2, r4c5<>9
- X-Wing: 1 r37 c37 => r2c37,r458c7,r568c3<>1
- Skyscraper: 1 in r5c8,r8c9 (connected by r58c2) => r46c9<>1
- Row 8 / Column 9 → 1 (Hidden Single)
- Row 7 / Column 3 → 1 (Hidden Single)
- Row 3 / Column 3 → 7 (Naked Single)
- Row 3 / Column 7 → 1 (Naked Single)
- Row 8 / Column 7 → 5 (Hidden Single)
- Row 2 / Column 7 → 9 (Naked Single)
- Row 1 / Column 8 → 8 (Naked Single)
- Row 2 / Column 3 → 6 (Naked Single)
- Row 2 / Column 8 → 5 (Naked Single)
- Row 1 / Column 9 → 7 (Full House)
- Row 9 / Column 8 → 6 (Naked Single)
- Row 6 / Column 8 → 1 (Naked Single)
- Row 5 / Column 8 → 9 (Full House)
- Row 7 / Column 7 → 7 (Naked Single)
- Row 6 / Column 5 → 5 (Naked Single)
- Row 7 / Column 4 → 3 (Naked Single)
- Row 7 / Column 6 → 6 (Full House)
- Row 9 / Column 7 → 3 (Naked Single)
- Row 9 / Column 9 → 8 (Full House)
- Row 4 / Column 5 → 1 (Naked Single)
- Row 6 / Column 9 → 3 (Naked Single)
- Row 4 / Column 9 → 5 (Full House)
- Row 2 / Column 4 → 8 (Naked Single)
- Row 4 / Column 7 → 2 (Naked Single)
- Row 5 / Column 7 → 6 (Full House)
- Row 6 / Column 3 → 2 (Naked Single)
- Row 2 / Column 6 → 3 (Naked Single)
- Row 5 / Column 4 → 2 (Naked Single)
- Row 4 / Column 1 → 4 (Naked Single)
- Row 5 / Column 2 → 1 (Naked Single)
- Row 5 / Column 3 → 5 (Naked Single)
- Row 5 / Column 6 → 8 (Full House)
- Row 6 / Column 4 → 4 (Naked Single)
- Row 4 / Column 6 → 9 (Full House)
- Row 4 / Column 2 → 3 (Full House)
- Row 6 / Column 1 → 6 (Full House)
- Row 8 / Column 3 → 9 (Naked Single)
- Row 1 / Column 3 → 3 (Full House)
- Row 2 / Column 1 → 1 (Naked Single)
- Row 2 / Column 2 → 4 (Full House)
- Row 3 / Column 4 → 9 (Naked Single)
- Row 8 / Column 4 → 7 (Full House)
- Row 8 / Column 6 → 2 (Naked Single)
- Row 3 / Column 6 → 4 (Full House)
- Row 3 / Column 5 → 2 (Full House)
- Row 8 / Column 2 → 6 (Full House)
- Row 9 / Column 5 → 9 (Full House)
- Row 1 / Column 2 → 2 (Naked Single)
- Row 1 / Column 1 → 9 (Full House)
- Row 9 / Column 1 → 2 (Full House)
- Row 9 / Column 2 → 7 (Full House)
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