Solution for Hard Sudoku #3197285361418
2
5
9
8
7
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7
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7
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5
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9
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1
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 → 7 (Hidden Single)
- Locked Triple: 2,7,8 in r456c3 => r37c3,r46c2,r5c1<>2, r3c3,r5c1<>8, r46c2<>7
- Row 5 / Column 1 → 6 (Naked Single)
- Row 5 / Column 7 → 7 (Naked Single)
- Locked Candidates Type 1 (Pointing): 1 in b4 => r8c2<>1
- Locked Candidates Type 1 (Pointing): 3 in b4 => r23c2<>3
- Locked Candidates Type 1 (Pointing): 3 in b6 => r7c7<>3
- Naked Pair: 2,8 in r5c39 => r5c4<>2, r5c46<>8
- X-Wing: 5 c37 r37 => r3c2568,r7c2458<>5
- Skyscraper: 5 in r8c5,r9c8 (connected by r2c58) => r9c46<>5
- Row 9 / Column 8 → 5 (Hidden Single)
- Row 3 / Column 7 → 5 (Hidden Single)
- Row 3 / Column 3 → 4 (Naked Single)
- Row 7 / Column 3 → 5 (Naked Single)
- Row 7 / Column 8 → 9 (Hidden Single)
- Row 7 / Column 2 → 2 (Naked Single)
- Row 3 / Column 2 → 6 (Naked Single)
- Row 8 / Column 1 → 1 (Naked Single)
- Row 8 / Column 2 → 9 (Naked Single)
- Row 9 / Column 1 → 4 (Full House)
- Row 8 / Column 9 → 6 (Naked Single)
- Row 7 / Column 7 → 4 (Naked Single)
- Row 8 / Column 6 → 5 (Naked Single)
- Row 8 / Column 5 → 2 (Full House)
- Row 4 / Column 7 → 3 (Naked Single)
- Row 6 / Column 7 → 6 (Full House)
- Row 7 / Column 9 → 3 (Naked Single)
- Row 9 / Column 9 → 1 (Full House)
- Row 5 / Column 6 → 9 (Naked Single)
- Row 4 / Column 2 → 1 (Naked Single)
- Row 7 / Column 4 → 8 (Naked Single)
- Row 7 / Column 5 → 6 (Full House)
- Row 5 / Column 4 → 5 (Naked Single)
- Row 9 / Column 6 → 3 (Naked Single)
- Row 9 / Column 4 → 9 (Full House)
- Row 4 / Column 5 → 8 (Naked Single)
- Row 6 / Column 2 → 3 (Naked Single)
- Row 1 / Column 4 → 7 (Naked Single)
- Row 3 / Column 6 → 8 (Naked Single)
- Row 2 / Column 5 → 5 (Naked Single)
- Row 3 / Column 5 → 9 (Naked Single)
- Row 6 / Column 5 → 1 (Full House)
- Row 4 / Column 6 → 7 (Naked Single)
- Row 6 / Column 4 → 2 (Full House)
- Row 2 / Column 4 → 3 (Full House)
- Row 1 / Column 6 → 6 (Full House)
- Row 1 / Column 2 → 5 (Naked Single)
- Row 2 / Column 2 → 7 (Full House)
- Row 3 / Column 8 → 2 (Naked Single)
- Row 3 / Column 1 → 3 (Full House)
- Row 4 / Column 3 → 2 (Naked Single)
- Row 4 / Column 8 → 4 (Full House)
- Row 6 / Column 8 → 8 (Naked Single)
- Row 2 / Column 8 → 6 (Full House)
- Row 5 / Column 9 → 2 (Full House)
- Row 5 / Column 3 → 8 (Full House)
- Row 6 / Column 3 → 7 (Full House)
- Row 2 / Column 1 → 8 (Naked Single)
- Row 1 / Column 1 → 2 (Full House)
- Row 1 / Column 9 → 8 (Full House)
- Row 2 / Column 9 → 4 (Full House)
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