Solution for Evil Sudoku #1278291345640
5
7
8
9
8
1
2
3
4
3
7
6
8
8
4
1
2
3
9
7
2
5
2
9
3
7
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 6 / Column 2 → 4 (Naked Single)
- Row 6 / Column 3 → 5 (Naked Single)
- Row 2 / Column 7 → 2 (Hidden Single)
- Row 2 / Column 2 → 6 (Naked Single)
- Row 5 / Column 8 → 3 (Hidden Single)
- Row 3 / Column 3 → 3 (Hidden Single)
- Row 5 / Column 1 → 9 (Hidden Single)
- Row 9 / Column 1 → 2 (Hidden Single)
- Row 1 / Column 1 → 1 (Naked Single)
- Row 1 / Column 3 → 2 (Naked Single)
- Row 3 / Column 1 → 4 (Full House)
- Row 4 / Column 3 → 1 (Naked Single)
- Row 5 / Column 2 → 2 (Full House)
- Row 7 / Column 3 → 4 (Naked Single)
- Row 8 / Column 3 → 7 (Full House)
- Row 4 / Column 8 → 9 (Hidden Single)
- Row 2 / Column 8 → 5 (Naked Single)
- Row 2 / Column 9 → 9 (Naked Single)
- Row 4 / Column 5 → 2 (Hidden Single)
- Row 9 / Column 9 → 4 (Hidden Single)
- Row 3 / Column 4 → 5 (Hidden Single)
- Row 8 / Column 1 → 5 (Hidden Single)
- Row 7 / Column 1 → 6 (Full House)
- Locked Candidates Type 1 (Pointing): 6 in b6 => r39c7<>6
- Row 8 / Column 8 → 6 (Hidden Single)
- Row 3 / Column 8 → 8 (Full House)
- Naked Triple: 1,5,8 in r7c279 => r7c5<>1, r7c6<>8
- Hidden Pair: 1,8 in r59c4 => r9c4<>6
- Row 9 / Column 6 → 6 (Hidden Single)
- Naked Triple: 3,7,9 in r167c6 => r5c6<>7
- Skyscraper: 7 in r1c6,r5c5 (connected by r15c9) => r3c5,r6c6<>7
- Row 3 / Column 5 → 6 (Naked Single)
- Row 1 / Column 4 → 9 (Naked Single)
- Row 1 / Column 6 → 7 (Naked Single)
- Row 1 / Column 9 → 6 (Full House)
- Uniqueness Test 1: 3/9 in r6c56,r7c56 => r6c5<>3, r6c5<>9
- Row 6 / Column 5 → 7 (Naked Single)
- Row 5 / Column 5 → 1 (Naked Single)
- Row 6 / Column 7 → 6 (Naked Single)
- Row 5 / Column 4 → 8 (Naked Single)
- Row 8 / Column 5 → 4 (Naked Single)
- Row 4 / Column 7 → 5 (Naked Single)
- Row 5 / Column 9 → 7 (Full House)
- Row 5 / Column 6 → 5 (Full House)
- Row 6 / Column 4 → 3 (Naked Single)
- Row 6 / Column 6 → 9 (Full House)
- Row 9 / Column 4 → 1 (Naked Single)
- Row 9 / Column 7 → 8 (Full House)
- Row 2 / Column 5 → 3 (Naked Single)
- Row 2 / Column 4 → 4 (Full House)
- Row 7 / Column 5 → 9 (Full House)
- Row 4 / Column 4 → 6 (Full House)
- Row 4 / Column 6 → 4 (Full House)
- Row 8 / Column 6 → 8 (Naked Single)
- Row 7 / Column 6 → 3 (Full House)
- Row 8 / Column 2 → 1 (Full House)
- Row 7 / Column 2 → 8 (Full House)
- Row 3 / Column 9 → 1 (Naked Single)
- Row 3 / Column 7 → 7 (Full House)
- Row 7 / Column 7 → 1 (Full House)
- Row 7 / Column 9 → 5 (Full House)
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