6
1
4
7
9
8
9
5
2
7
9
8
5
1
9
2
5
2
1
3
6
4
This Sudoku Puzzle has 72 steps and it is solved using Naked Single, Hidden Single, Locked Candidates Type 1 (Pointing), Full House, Naked Pair, Naked Triple, Hidden Pair, undefined techniques.
Naked Single
Explanation
Hidden Single
Explanation
Hidden Pair
Explanation
Locked Candidates
Explanation
Full House
Explanation
Solution Steps:
- Row 1 / Column 6 → 2 (Naked Single)
- Row 1 / Column 1 → 9 (Hidden Single)
- Row 4 / Column 6 → 9 (Hidden Single)
- Row 8 / Column 6 → 7 (Hidden Single)
- Row 6 / Column 6 → 4 (Hidden Single)
- Locked Candidates Type 1 (Pointing): 1 in b2 => r56c5<>1
- Locked Candidates Type 1 (Pointing): 5 in b2 => r79c5<>5
- Locked Candidates Type 1 (Pointing): 4 in b3 => r3c123<>4
- Locked Candidates Type 1 (Pointing): 6 in b3 => r3c56<>6
- Row 3 / Column 6 → 8 (Naked Single)
- Row 2 / Column 6 → 6 (Full House)
- Row 3 / Column 1 → 3 (Naked Single)
- Row 2 / Column 4 → 3 (Naked Single)
- Row 2 / Column 8 → 2 (Naked Single)
- Row 3 / Column 2 → 2 (Hidden Single)
- Locked Candidates Type 1 (Pointing): 5 in b1 => r4c3<>5
- Locked Candidates Type 1 (Pointing): 7 in b1 => r79c3<>7
- Locked Candidates Type 1 (Pointing): 6 in b7 => r9c45<>6
- Locked Candidates Type 1 (Pointing): 5 in b9 => r6c7<>5
- Naked Pair: 4,8 in r27c1 => r5c1<>4, r59c1<>8
- Naked Triple: 1,3,7 in r1c79,r3c8 => r3c79<>7, r3c9<>1
- Hidden Pair: 2,5 in r79c7 => r7c7<>3, r79c7<>7, r79c7<>8
- Locked Candidates Type 1 (Pointing): 7 in b9 => r145c9<>7
- XY-Wing: 1/7/3 in r1c7,r38c8 => r8c7<>3
- Row 8 / Column 7 → 8 (Naked Single)
- Row 8 / Column 4 → 6 (Naked Single)
- Row 4 / Column 4 → 7 (Naked Single)
- Row 6 / Column 4 → 1 (Naked Single)
- Row 5 / Column 4 → 2 (Naked Single)
- Row 6 / Column 2 → 8 (Hidden Single)
- Row 2 / Column 2 → 4 (Naked Single)
- Row 2 / Column 1 → 8 (Full House)
- Row 7 / Column 1 → 4 (Naked Single)
- Row 5 / Column 9 → 8 (Hidden Single)
- Row 3 / Column 8 → 7 (Hidden Single)
- Row 1 / Column 7 → 3 (Naked Single)
- Row 3 / Column 3 → 5 (Naked Single)
- Row 1 / Column 3 → 7 (Full House)
- Row 1 / Column 9 → 1 (Naked Single)
- Row 1 / Column 5 → 5 (Full House)
- Row 3 / Column 5 → 1 (Full House)
- Row 6 / Column 7 → 6 (Naked Single)
- Row 3 / Column 7 → 4 (Naked Single)
- Row 3 / Column 9 → 6 (Full House)
- Row 6 / Column 5 → 3 (Naked Single)
- Row 5 / Column 5 → 6 (Full House)
- Row 6 / Column 8 → 5 (Full House)
- Row 5 / Column 7 → 7 (Naked Single)
- Row 5 / Column 1 → 1 (Naked Single)
- Row 9 / Column 1 → 6 (Full House)
- Row 4 / Column 8 → 3 (Naked Single)
- Row 4 / Column 9 → 4 (Full House)
- Row 8 / Column 8 → 1 (Full House)
- Row 5 / Column 2 → 3 (Naked Single)
- Row 5 / Column 3 → 4 (Full House)
- Row 9 / Column 3 → 8 (Naked Single)
- Row 4 / Column 2 → 5 (Naked Single)
- Row 4 / Column 3 → 6 (Full House)
- Row 7 / Column 3 → 3 (Full House)
- Row 8 / Column 2 → 9 (Naked Single)
- Row 9 / Column 4 → 5 (Naked Single)
- Row 7 / Column 4 → 8 (Full House)
- Row 7 / Column 2 → 7 (Naked Single)
- Row 9 / Column 2 → 1 (Full House)
- Row 8 / Column 5 → 4 (Naked Single)
- Row 8 / Column 9 → 3 (Full House)
- Row 9 / Column 7 → 2 (Naked Single)
- Row 7 / Column 7 → 5 (Full House)
- Row 7 / Column 9 → 9 (Naked Single)
- Row 7 / Column 5 → 2 (Full House)
- Row 9 / Column 5 → 9 (Full House)
- Row 9 / Column 9 → 7 (Full House)
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