Solution for Evil Sudoku #2331642895792
2
4
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6
8
1
7
5
9
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9
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2
This Sudoku Puzzle has 71 steps and it is solved using Hidden Single, Locked Pair, Naked Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Full House, Naked Pair techniques.
Naked Single
Explanation
Hidden Single
Explanation
Locked Candidates
Explanation
Locked Candidates
Explanation
Full House
Explanation
Solution Steps:
- Row 8 / Column 1 → 5 (Hidden Single)
- Row 9 / Column 6 → 3 (Hidden Single)
- Row 6 / Column 8 → 5 (Hidden Single)
- Row 3 / Column 5 → 3 (Hidden Single)
- Row 9 / Column 4 → 1 (Hidden Single)
- Locked Pair: 2,7 in r23c4 => r1c46,r3c6,r48c4<>2, r1c46,r3c6,r78c4<>7
- Row 1 / Column 4 → 5 (Naked Single)
- Row 4 / Column 6 → 5 (Hidden Single)
- Locked Candidates Type 1 (Pointing): 9 in b1 => r46c3<>9
- Locked Candidates Type 1 (Pointing): 1 in b2 => r56c6<>1
- Locked Candidates Type 1 (Pointing): 4 in b5 => r78c6<>4
- Locked Candidates Type 1 (Pointing): 3 in b6 => r6c123<>3
- Locked Candidates Type 1 (Pointing): 2 in b8 => r8c89<>2
- Locked Candidates Type 2 (Claiming): 1 in r2 => r1c13,r3c13<>1
- Locked Candidates Type 2 (Claiming): 4 in r9 => r78c9,r8c8<>4
- Locked Pair: 6,8 in r78c9 => r13c9,r7c7<>8, r36c9,r7c7,r8c8<>6
- Row 3 / Column 8 → 6 (Hidden Single)
- Row 3 / Column 9 → 4 (Hidden Single)
- Row 9 / Column 9 → 2 (Naked Single)
- Row 9 / Column 8 → 4 (Full House)
- Row 6 / Column 9 → 3 (Naked Single)
- Row 1 / Column 9 → 1 (Naked Single)
- Row 1 / Column 6 → 8 (Naked Single)
- Row 3 / Column 6 → 1 (Naked Single)
- Locked Candidates Type 1 (Pointing): 2 in b6 => r123c7<>2
- Naked Pair: 2,7 in r2c48 => r2c2<>2, r2c27<>7
- Locked Candidates Type 1 (Pointing): 2 in b1 => r456c1<>2
- Locked Candidates Type 1 (Pointing): 7 in b1 => r56c1<>7
- Locked Pair: 1,4 in r56c1 => r56c2,r6c3,r7c1<>1, r6c3,r7c1<>4
- Row 7 / Column 1 → 8 (Naked Single)
- Row 6 / Column 3 → 6 (Naked Single)
- Row 4 / Column 1 → 3 (Naked Single)
- Row 7 / Column 2 → 1 (Naked Single)
- Row 7 / Column 9 → 6 (Naked Single)
- Row 8 / Column 9 → 8 (Full House)
- Row 8 / Column 2 → 3 (Naked Single)
- Row 8 / Column 3 → 4 (Full House)
- Row 6 / Column 7 → 2 (Naked Single)
- Row 5 / Column 7 → 6 (Full House)
- Row 4 / Column 3 → 8 (Naked Single)
- Row 7 / Column 6 → 7 (Naked Single)
- Row 2 / Column 2 → 8 (Naked Single)
- Row 3 / Column 3 → 9 (Naked Single)
- Row 6 / Column 6 → 4 (Naked Single)
- Row 7 / Column 7 → 9 (Naked Single)
- Row 7 / Column 4 → 4 (Full House)
- Row 8 / Column 8 → 7 (Full House)
- Row 2 / Column 7 → 3 (Naked Single)
- Row 1 / Column 3 → 3 (Naked Single)
- Row 2 / Column 3 → 1 (Full House)
- Row 5 / Column 6 → 2 (Naked Single)
- Row 8 / Column 6 → 6 (Full House)
- Row 6 / Column 1 → 1 (Naked Single)
- Row 2 / Column 8 → 2 (Naked Single)
- Row 1 / Column 8 → 9 (Full House)
- Row 2 / Column 4 → 7 (Full House)
- Row 3 / Column 4 → 2 (Full House)
- Row 1 / Column 7 → 7 (Naked Single)
- Row 1 / Column 1 → 2 (Full House)
- Row 3 / Column 1 → 7 (Full House)
- Row 5 / Column 1 → 4 (Full House)
- Row 3 / Column 7 → 8 (Full House)
- Row 4 / Column 5 → 9 (Naked Single)
- Row 5 / Column 2 → 7 (Naked Single)
- Row 5 / Column 5 → 1 (Full House)
- Row 8 / Column 4 → 9 (Naked Single)
- Row 4 / Column 4 → 6 (Full House)
- Row 4 / Column 2 → 2 (Full House)
- Row 6 / Column 5 → 7 (Full House)
- Row 8 / Column 5 → 2 (Full House)
- Row 6 / Column 2 → 9 (Full House)
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