9
6
8
8
2
4
3
8
6
9
4
7
2
3
9
4
7
3
1
3
6
5
2
7
4
This Sudoku Puzzle has 61 steps and it is solved using Hidden Single, Locked Candidates Type 2 (Claiming), Naked Pair, Naked Triple, Naked Single, Full House, Locked Candidates Type 1 (Pointing) techniques.
Naked Single
Explanation
Hidden Single
Explanation
Locked Candidates
Explanation
Locked Candidates
Explanation
Full House
Explanation
Solution Steps:
- Row 1 / Column 4 → 6 (Hidden Single)
- Row 1 / Column 7 → 2 (Hidden Single)
- Row 9 / Column 8 → 3 (Hidden Single)
- Row 9 / Column 3 → 2 (Hidden Single)
- Row 8 / Column 6 → 2 (Hidden Single)
- Locked Candidates Type 2 (Claiming): 8 in r9 => r8c4<>8
- Naked Pair: 6,9 in r9c27 => r9c46<>9
- Naked Triple: 1,4,5 in r1c23,r3c3 => r2c12,r3c1<>5, r2c2<>1, r2c2<>4
- Row 2 / Column 8 → 4 (Hidden Single)
- Row 8 / Column 8 → 9 (Hidden Single)
- Row 9 / Column 7 → 6 (Naked Single)
- Row 9 / Column 2 → 9 (Naked Single)
- Row 3 / Column 7 → 9 (Hidden Single)
- Row 7 / Column 5 → 9 (Hidden Single)
- Row 5 / Column 2 → 6 (Hidden Single)
- Row 7 / Column 3 → 4 (Hidden Single)
- Row 8 / Column 2 → 5 (Naked Single)
- Row 7 / Column 1 → 8 (Naked Single)
- Row 8 / Column 1 → 6 (Full House)
- Row 5 / Column 6 → 3 (Hidden Single)
- Row 1 / Column 2 → 4 (Hidden Single)
- Row 5 / Column 3 → 8 (Hidden Single)
- Row 8 / Column 9 → 8 (Hidden Single)
- Naked Triple: 1,5,7 in r237c9 => r46c9<>1, r46c9<>5, r4c9<>7
- Locked Candidates Type 1 (Pointing): 7 in b6 => r1c8<>7
- Row 1 / Column 6 → 7 (Hidden Single)
- Row 9 / Column 6 → 8 (Naked Single)
- Row 9 / Column 4 → 7 (Full House)
- Row 4 / Column 5 → 7 (Hidden Single)
- Row 5 / Column 8 → 7 (Hidden Single)
- Row 4 / Column 4 → 4 (Hidden Single)
- Row 8 / Column 4 → 1 (Naked Single)
- Row 8 / Column 5 → 4 (Full House)
- Row 5 / Column 4 → 5 (Naked Single)
- Row 5 / Column 7 → 1 (Full House)
- Row 7 / Column 7 → 5 (Full House)
- Row 7 / Column 9 → 1 (Full House)
- Row 2 / Column 4 → 9 (Naked Single)
- Row 6 / Column 4 → 8 (Full House)
- Row 4 / Column 6 → 1 (Naked Single)
- Row 6 / Column 8 → 5 (Naked Single)
- Row 2 / Column 6 → 5 (Naked Single)
- Row 6 / Column 6 → 9 (Full House)
- Row 6 / Column 5 → 6 (Full House)
- Row 4 / Column 2 → 2 (Naked Single)
- Row 1 / Column 8 → 1 (Naked Single)
- Row 4 / Column 8 → 8 (Full House)
- Row 1 / Column 3 → 5 (Full House)
- Row 3 / Column 3 → 1 (Full House)
- Row 2 / Column 9 → 7 (Naked Single)
- Row 3 / Column 9 → 5 (Full House)
- Row 6 / Column 9 → 2 (Naked Single)
- Row 4 / Column 9 → 6 (Full House)
- Row 4 / Column 1 → 5 (Full House)
- Row 2 / Column 2 → 3 (Naked Single)
- Row 6 / Column 2 → 1 (Full House)
- Row 6 / Column 1 → 3 (Full House)
- Row 3 / Column 5 → 3 (Naked Single)
- Row 2 / Column 5 → 1 (Full House)
- Row 2 / Column 1 → 2 (Full House)
- Row 3 / Column 1 → 7 (Full House)
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