Solution for Hard Sudoku #1117938624518
3
2
6
7
7
5
4
9
3
8
5
1
5
6
2
1
4
8
4
1
4
9
5
7
1
4
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 2 / Column 8 → 7 (Hidden Single)
- Locked Triple: 3,7,9 in r456c3 => r37c3,r46c2,r5c1<>9, r5c1,r7c3<>3, r46c2<>7
- Row 5 / Column 1 → 2 (Naked Single)
- Row 5 / Column 7 → 7 (Naked Single)
- Locked Candidates Type 1 (Pointing): 4 in b4 => r2c2<>4
- Locked Candidates Type 1 (Pointing): 6 in b4 => r78c2<>6
- Locked Candidates Type 1 (Pointing): 6 in b6 => r3c7<>6
- Naked Pair: 3,9 in r5c39 => r5c46<>3, r5c4<>9
- X-Wing: 8 c37 r37 => r3c2458,r7c2568<>8
- Skyscraper: 8 in r1c8,r2c5 (connected by r8c58) => r1c46<>8
- Row 1 / Column 8 → 8 (Hidden Single)
- Row 3 / Column 3 → 8 (Hidden Single)
- Row 7 / Column 3 → 5 (Naked Single)
- Row 7 / Column 7 → 8 (Hidden Single)
- Row 3 / Column 8 → 1 (Hidden Single)
- Row 3 / Column 2 → 9 (Naked Single)
- Row 2 / Column 1 → 4 (Naked Single)
- Row 2 / Column 2 → 1 (Naked Single)
- Row 1 / Column 1 → 5 (Full House)
- Row 7 / Column 2 → 2 (Naked Single)
- Row 2 / Column 9 → 2 (Naked Single)
- Row 2 / Column 6 → 8 (Naked Single)
- Row 2 / Column 5 → 9 (Full House)
- Row 3 / Column 7 → 5 (Naked Single)
- Row 5 / Column 6 → 1 (Naked Single)
- Row 3 / Column 9 → 6 (Naked Single)
- Row 1 / Column 9 → 4 (Full House)
- Row 6 / Column 7 → 6 (Naked Single)
- Row 4 / Column 7 → 2 (Full House)
- Row 1 / Column 6 → 6 (Naked Single)
- Row 1 / Column 4 → 1 (Full House)
- Row 5 / Column 4 → 8 (Naked Single)
- Row 3 / Column 4 → 3 (Naked Single)
- Row 3 / Column 5 → 2 (Full House)
- Row 6 / Column 2 → 4 (Naked Single)
- Row 7 / Column 6 → 3 (Naked Single)
- Row 9 / Column 4 → 7 (Naked Single)
- Row 4 / Column 2 → 6 (Naked Single)
- Row 6 / Column 5 → 3 (Naked Single)
- Row 6 / Column 6 → 7 (Naked Single)
- Row 9 / Column 6 → 2 (Full House)
- Row 7 / Column 5 → 1 (Naked Single)
- Row 7 / Column 8 → 9 (Naked Single)
- Row 7 / Column 1 → 6 (Full House)
- Row 8 / Column 5 → 8 (Naked Single)
- Row 8 / Column 4 → 6 (Full House)
- Row 4 / Column 4 → 9 (Full House)
- Row 4 / Column 5 → 4 (Full House)
- Row 9 / Column 2 → 8 (Naked Single)
- Row 8 / Column 2 → 7 (Full House)
- Row 6 / Column 3 → 9 (Naked Single)
- Row 6 / Column 8 → 5 (Full House)
- Row 4 / Column 8 → 3 (Naked Single)
- Row 4 / Column 3 → 7 (Full House)
- Row 5 / Column 3 → 3 (Full House)
- Row 5 / Column 9 → 9 (Full House)
- Row 8 / Column 8 → 2 (Full House)
- Row 9 / Column 9 → 3 (Naked Single)
- Row 8 / Column 9 → 5 (Full House)
- Row 8 / Column 1 → 3 (Full House)
- Row 9 / Column 1 → 9 (Full House)
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