Solution for Evil Sudoku #2274586391240
2
9
3
8
1
5
6
4
7
7
4
8
6
3
9
5
2
1
5
1
6
4
2
7
3
8
9
4
8
1
7
3
9
5
6
2
9
5
2
1
6
4
8
7
3
6
7
3
2
5
8
1
9
4
1
5
6
3
2
8
9
7
4
3
8
7
4
9
5
2
1
6
9
4
2
7
6
1
8
3
5
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 8 → 9 (Naked Single)
- Row 6 / Column 7 → 1 (Naked Single)
- Row 2 / Column 3 → 5 (Hidden Single)
- Row 2 / Column 8 → 2 (Naked Single)
- Row 5 / Column 2 → 3 (Hidden Single)
- Row 8 / Column 7 → 7 (Hidden Single)
- Row 5 / Column 9 → 8 (Hidden Single)
- Row 3 / Column 7 → 3 (Hidden Single)
- Row 9 / Column 9 → 5 (Hidden Single)
- Row 1 / Column 9 → 6 (Naked Single)
- Row 1 / Column 7 → 5 (Naked Single)
- Row 3 / Column 9 → 9 (Full House)
- Row 4 / Column 7 → 6 (Naked Single)
- Row 5 / Column 8 → 5 (Full House)
- Row 7 / Column 7 → 9 (Full House)
- Row 4 / Column 2 → 8 (Hidden Single)
- Row 2 / Column 2 → 1 (Naked Single)
- Row 2 / Column 1 → 8 (Naked Single)
- Row 4 / Column 5 → 5 (Hidden Single)
- Row 9 / Column 1 → 9 (Hidden Single)
- Row 3 / Column 6 → 1 (Hidden Single)
- Row 8 / Column 9 → 1 (Hidden Single)
- Row 7 / Column 9 → 2 (Full House)
- Locked Candidates Type 1 (Pointing): 2 in b4 => r39c3<>2
- Row 8 / Column 2 → 2 (Hidden Single)
- Row 3 / Column 2 → 4 (Full House)
- Naked Triple: 1,4,6 in r7c138 => r7c4<>4, r7c5<>6
- Hidden Pair: 4,6 in r59c6 => r9c6<>2
- Row 9 / Column 4 → 2 (Hidden Single)
- Naked Triple: 3,7,8 in r167c4 => r5c4<>7
- Skyscraper: 7 in r1c4,r5c5 (connected by r15c1) => r3c5,r6c4<>7
- Row 3 / Column 5 → 2 (Naked Single)
- Row 1 / Column 6 → 8 (Naked Single)
- Row 1 / Column 4 → 7 (Naked Single)
- Row 1 / Column 1 → 2 (Full House)
- Uniqueness Test 1: 3/8 in r6c45,r7c45 => r6c5<>3, r6c5<>8
- Row 6 / Column 5 → 7 (Naked Single)
- Row 5 / Column 5 → 6 (Naked Single)
- Row 6 / Column 3 → 2 (Naked Single)
- Row 5 / Column 6 → 4 (Naked Single)
- Row 8 / Column 5 → 9 (Naked Single)
- Row 4 / Column 3 → 1 (Naked Single)
- Row 5 / Column 1 → 7 (Full House)
- Row 5 / Column 4 → 1 (Full House)
- Row 6 / Column 6 → 3 (Naked Single)
- Row 6 / Column 4 → 8 (Full House)
- Row 9 / Column 6 → 6 (Naked Single)
- Row 9 / Column 3 → 4 (Full House)
- Row 2 / Column 5 → 3 (Naked Single)
- Row 2 / Column 6 → 9 (Full House)
- Row 7 / Column 5 → 8 (Full House)
- Row 4 / Column 6 → 2 (Full House)
- Row 4 / Column 4 → 9 (Full House)
- Row 8 / Column 4 → 4 (Naked Single)
- Row 7 / Column 4 → 3 (Full House)
- Row 8 / Column 8 → 6 (Full House)
- Row 7 / Column 8 → 4 (Full House)
- Row 3 / Column 1 → 6 (Naked Single)
- Row 3 / Column 3 → 7 (Full House)
- Row 7 / Column 3 → 6 (Full House)
- Row 7 / Column 1 → 1 (Full House)
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