Solution for Hard Sudoku #1248693217518
4
7
4
3
5
8
9
2
1
7
5
6
1
2
5
5
8
7
7
4
2
8
7
3
4
9
6
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 → 8 (Hidden Single)
- Locked Triple: 6,8,9 in r3c456 => r1c5,r2c46,r3c37<>6, r1c5,r3c3<>9, r2c46<>8
- Row 1 / Column 5 → 1 (Naked Single)
- Row 7 / Column 5 → 8 (Naked Single)
- Locked Candidates Type 1 (Pointing): 2 in b2 => r2c23<>2
- Locked Candidates Type 1 (Pointing): 7 in b2 => r2c8<>7
- Locked Candidates Type 1 (Pointing): 2 in b8 => r7c7<>2
- Naked Pair: 6,9 in r39c5 => r4c5<>6, r46c5<>9
- X-Wing: 3 r37 c37 => r2c37,r458c7,r568c3<>3
- Skyscraper: 3 in r5c8,r8c9 (connected by r58c2) => r46c9<>3
- Row 8 / Column 9 → 3 (Hidden Single)
- Row 7 / Column 3 → 3 (Hidden Single)
- Row 3 / Column 3 → 5 (Naked Single)
- Row 3 / Column 7 → 3 (Naked Single)
- Row 8 / Column 7 → 4 (Hidden Single)
- Row 2 / Column 7 → 6 (Naked Single)
- Row 1 / Column 8 → 7 (Naked Single)
- Row 2 / Column 3 → 1 (Naked Single)
- Row 2 / Column 8 → 4 (Naked Single)
- Row 1 / Column 9 → 5 (Full House)
- Row 9 / Column 8 → 1 (Naked Single)
- Row 6 / Column 8 → 3 (Naked Single)
- Row 5 / Column 8 → 6 (Full House)
- Row 7 / Column 7 → 5 (Naked Single)
- Row 6 / Column 5 → 4 (Naked Single)
- Row 7 / Column 4 → 2 (Naked Single)
- Row 7 / Column 6 → 1 (Full House)
- Row 9 / Column 7 → 2 (Naked Single)
- Row 9 / Column 9 → 7 (Full House)
- Row 4 / Column 5 → 3 (Naked Single)
- Row 6 / Column 9 → 2 (Naked Single)
- Row 4 / Column 9 → 4 (Full House)
- Row 2 / Column 4 → 7 (Naked Single)
- Row 4 / Column 7 → 9 (Naked Single)
- Row 5 / Column 7 → 1 (Full House)
- Row 6 / Column 3 → 9 (Naked Single)
- Row 2 / Column 6 → 2 (Naked Single)
- Row 5 / Column 4 → 9 (Naked Single)
- Row 4 / Column 1 → 8 (Naked Single)
- Row 5 / Column 2 → 3 (Naked Single)
- Row 5 / Column 3 → 4 (Naked Single)
- Row 5 / Column 6 → 7 (Full House)
- Row 6 / Column 4 → 8 (Naked Single)
- Row 4 / Column 6 → 6 (Full House)
- Row 4 / Column 2 → 2 (Full House)
- Row 6 / Column 1 → 1 (Full House)
- Row 8 / Column 3 → 6 (Naked Single)
- Row 1 / Column 3 → 2 (Full House)
- Row 2 / Column 1 → 3 (Naked Single)
- Row 2 / Column 2 → 8 (Full House)
- Row 3 / Column 4 → 6 (Naked Single)
- Row 8 / Column 4 → 5 (Full House)
- Row 8 / Column 6 → 9 (Naked Single)
- Row 3 / Column 6 → 8 (Full House)
- Row 3 / Column 5 → 9 (Full House)
- Row 8 / Column 2 → 1 (Full House)
- Row 9 / Column 5 → 6 (Full House)
- Row 1 / Column 2 → 9 (Naked Single)
- Row 1 / Column 1 → 6 (Full House)
- Row 9 / Column 1 → 9 (Full House)
- Row 9 / Column 2 → 5 (Full House)
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