Solution for Evil Sudoku #4227963518440
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2
7
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9
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7
1
9
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9
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7
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9
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5
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7
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6
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3
This Sudoku Puzzle has 61 steps and it is solved using Naked Single, Hidden Single, Full House, Locked Candidates Type 1 (Pointing), Naked Triple, Hidden Pair, Skyscraper, Uniqueness Test 1 techniques.
Naked Single
Explanation
Hidden Single
Explanation
Hidden Pair
Explanation
Locked Candidates
Explanation
Full House
Explanation
Solution Steps:
- Row 4 / Column 8 → 1 (Naked Single)
- Row 4 / Column 7 → 8 (Naked Single)
- Row 1 / Column 9 → 9 (Hidden Single)
- Row 5 / Column 9 → 6 (Hidden Single)
- Row 2 / Column 7 → 2 (Hidden Single)
- Row 5 / Column 2 → 5 (Hidden Single)
- Row 7 / Column 7 → 5 (Hidden Single)
- Row 8 / Column 3 → 9 (Hidden Single)
- Row 8 / Column 8 → 4 (Naked Single)
- Row 9 / Column 9 → 3 (Naked Single)
- Row 7 / Column 9 → 1 (Naked Single)
- Row 9 / Column 7 → 9 (Full House)
- Row 6 / Column 7 → 3 (Naked Single)
- Row 3 / Column 7 → 1 (Full House)
- Row 5 / Column 8 → 9 (Full House)
- Row 6 / Column 2 → 6 (Hidden Single)
- Row 8 / Column 2 → 8 (Naked Single)
- Row 8 / Column 1 → 6 (Naked Single)
- Row 6 / Column 5 → 9 (Hidden Single)
- Row 1 / Column 1 → 1 (Hidden Single)
- Row 2 / Column 9 → 8 (Hidden Single)
- Row 3 / Column 9 → 4 (Full House)
- Row 7 / Column 6 → 8 (Hidden Single)
- Locked Candidates Type 1 (Pointing): 4 in b4 => r17c3<>4
- Row 2 / Column 2 → 4 (Hidden Single)
- Row 7 / Column 2 → 7 (Full House)
- Naked Triple: 3,7,8 in r3c138 => r3c4<>7, r3c5<>3
- Hidden Pair: 3,7 in r15c6 => r1c6<>4
- Row 1 / Column 4 → 4 (Hidden Single)
- Naked Triple: 2,5,6 in r349c4 => r5c4<>2
- Skyscraper: 2 in r5c5,r9c4 (connected by r59c1) => r4c4,r7c5<>2
- Row 7 / Column 5 → 4 (Naked Single)
- Row 9 / Column 6 → 6 (Naked Single)
- Row 9 / Column 4 → 2 (Naked Single)
- Row 9 / Column 1 → 4 (Full House)
- Uniqueness Test 1: 5/6 in r3c45,r4c45 => r4c5<>5, r4c5<>6
- Row 4 / Column 5 → 2 (Naked Single)
- Row 4 / Column 3 → 4 (Naked Single)
- Row 5 / Column 5 → 3 (Naked Single)
- Row 4 / Column 6 → 5 (Naked Single)
- Row 4 / Column 4 → 6 (Full House)
- Row 6 / Column 3 → 8 (Naked Single)
- Row 5 / Column 1 → 2 (Full House)
- Row 2 / Column 5 → 1 (Naked Single)
- Row 5 / Column 6 → 7 (Naked Single)
- Row 5 / Column 4 → 8 (Full House)
- Row 8 / Column 6 → 1 (Naked Single)
- Row 8 / Column 5 → 5 (Full House)
- Row 3 / Column 5 → 6 (Full House)
- Row 3 / Column 4 → 5 (Naked Single)
- Row 6 / Column 4 → 1 (Naked Single)
- Row 2 / Column 4 → 7 (Full House)
- Row 1 / Column 6 → 3 (Full House)
- Row 6 / Column 6 → 4 (Full House)
- Row 2 / Column 8 → 3 (Full House)
- Row 1 / Column 3 → 7 (Full House)
- Row 3 / Column 8 → 7 (Full House)
- Row 7 / Column 1 → 3 (Naked Single)
- Row 3 / Column 1 → 8 (Full House)
- Row 3 / Column 3 → 3 (Full House)
- Row 7 / Column 3 → 2 (Full House)
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