Solution for Evil Sudoku #1277713524895
1
8
3
4
2
7
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3
7
7
7
2
5
8
7
1
7
3
7
8
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4
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7
5
4
This Sudoku Puzzle has 69 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Hidden Pair, Locked Pair, Naked Single, Full House techniques.
Naked Single
Explanation
Hidden Single
Explanation
Hidden Pair
Explanation
Locked Candidates
Explanation
Locked Candidates
Explanation
Full House
Explanation
Solution Steps:
- Row 2 / Column 4 → 7 (Hidden Single)
- Row 5 / Column 1 → 1 (Hidden Single)
- Row 8 / Column 8 → 7 (Hidden Single)
- Row 7 / Column 1 → 4 (Hidden Single)
- Row 8 / Column 7 → 8 (Hidden Single)
- Locked Candidates Type 1 (Pointing): 1 in b2 => r3c9<>1
- Locked Candidates Type 1 (Pointing): 4 in b3 => r5c9<>4
- Locked Candidates Type 1 (Pointing): 8 in b6 => r1c8<>8
- Locked Candidates Type 1 (Pointing): 5 in b7 => r9c5<>5
- Locked Candidates Type 2 (Claiming): 2 in r8 => r9c12<>2
- Locked Candidates Type 2 (Claiming): 3 in c1 => r8c23,r9c2<>3
- Hidden Pair: 4,8 in r13c9 => r13c9<>2, r13c9<>6, r13c9<>9
- Row 1 / Column 8 → 2 (Hidden Single)
- Locked Candidates Type 1 (Pointing): 5 in b3 => r2c23<>5
- Locked Candidates Type 1 (Pointing): 6 in b3 => r2c23<>6
- Locked Pair: 3,9 in r2c23 => r1c13,r2c789,r3c123<>9
- Locked Candidates Type 2 (Claiming): 9 in r1 => r3c456<>9
- Locked Candidates Type 2 (Claiming): 9 in c1 => r8c23,r9c2<>9
- Locked Pair: 2,6 in r8c23 => r8c1<>2, r8c16,r9c12<>6
- Row 9 / Column 2 → 5 (Naked Single)
- Row 3 / Column 1 → 2 (Hidden Single)
- Row 4 / Column 3 → 5 (Hidden Single)
- Row 1 / Column 1 → 5 (Hidden Single)
- Locked Pair: 4,6 in r13c3 => r3c2,r5c3<>4, r3c2,r58c3<>6
- Row 8 / Column 3 → 2 (Naked Single)
- Row 3 / Column 2 → 6 (Naked Single)
- Row 8 / Column 2 → 6 (Naked Single)
- Row 1 / Column 3 → 4 (Naked Single)
- Row 3 / Column 3 → 4 (Naked Single)
- Row 1 / Column 9 → 8 (Naked Single)
- Row 3 / Column 9 → 8 (Naked Single)
- Row 3 / Column 4 → 1 (Naked Single)
- Row 3 / Column 5 → 5 (Naked Single)
- Row 3 / Column 6 → 5 (Naked Single)
- Row 9 / Column 4 → 8 (Hidden Single)
- Row 6 / Column 6 → 1 (Hidden Single)
- Row 7 / Column 4 → 2 (Hidden Single)
- Row 4 / Column 6 → 4 (Hidden Single)
- Row 4 / Column 2 → 3 (Hidden Single)
- Row 2 / Column 2 → 9 (Naked Single)
- Row 5 / Column 3 → 9 (Naked Single)
- Row 2 / Column 3 → 3 (Naked Single)
- Row 5 / Column 8 → 6 (Naked Single)
- Row 5 / Column 5 → 3 (Naked Single)
- Row 5 / Column 9 → 2 (Naked Single)
- Row 5 / Column 2 → 4 (Full House)
- Row 5 / Column 7 → 4 (Full House)
- Row 4 / Column 8 → 8 (Hidden Single)
- Row 6 / Column 2 → 8 (Hidden Single)
- Row 4 / Column 4 → 6 (Hidden Single)
- Row 6 / Column 4 → 9 (Full House)
- Row 6 / Column 7 → 5 (Full House)
- Row 6 / Column 8 → 5 (Full House)
- Row 2 / Column 7 → 6 (Naked Single)
- Row 2 / Column 8 → 1 (Full House)
- Row 2 / Column 9 → 1 (Full House)
- Row 7 / Column 8 → 9 (Naked Single)
- Row 7 / Column 5 → 6 (Naked Single)
- Row 1 / Column 5 → 9 (Full House)
- Row 9 / Column 5 → 9 (Full House)
- Row 1 / Column 6 → 6 (Full House)
- Row 7 / Column 7 → 3 (Naked Single)
- Row 7 / Column 9 → 6 (Naked Single)
- Row 9 / Column 9 → 6 (Naked Single)
- Row 7 / Column 6 → 3 (Naked Single)
- Row 8 / Column 6 → 3 (Naked Single)
- Row 9 / Column 1 → 3 (Naked Single)
- Row 8 / Column 1 → 9 (Full House)
- Row 9 / Column 7 → 2 (Naked Single)
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