9
5
7
1
7
4
5
5
4
2
2
3
1
8
5
2
9
3
9
1
8
3
5
7
This Sudoku Puzzle has 66 steps and it is solved using Hidden Single, Locked Triple, Naked Single, Locked Candidates Type 1 (Pointing), Naked Pair, Naked Triple, Full House, undefined techniques.
Naked Single
Explanation
Hidden Single
Explanation
Locked Candidates
Explanation
Full House
Explanation
Solution Steps:
- Row 5 / Column 2 → 5 (Hidden Single)
- Row 6 / Column 7 → 5 (Hidden Single)
- Row 8 / Column 5 → 3 (Hidden Single)
- Row 2 / Column 9 → 8 (Hidden Single)
- Row 5 / Column 1 → 2 (Hidden Single)
- Row 4 / Column 6 → 3 (Hidden Single)
- Row 8 / Column 9 → 2 (Hidden Single)
- Locked Triple: 1,6,8 in r456c5 => r12c5<>1, r129c5,r5c46<>6, r1c5,r5c4<>8
- Row 1 / Column 5 → 2 (Naked Single)
- Row 3 / Column 2 → 2 (Hidden Single)
- Row 2 / Column 7 → 2 (Hidden Single)
- Row 9 / Column 4 → 2 (Hidden Single)
- Locked Candidates Type 1 (Pointing): 7 in b5 => r5c38<>7
- Row 1 / Column 8 → 7 (Hidden Single)
- Row 4 / Column 7 → 7 (Hidden Single)
- Row 5 / Column 8 → 4 (Hidden Single)
- Locked Candidates Type 1 (Pointing): 9 in b5 => r5c3<>9
- Locked Candidates Type 1 (Pointing): 1 in b7 => r46c2<>1
- Naked Pair: 1,6 in r1c67 => r1c24<>6
- Naked Triple: 4,6,8 in r4c12,r5c3 => r4c3<>4, r46c3,r6c12<>6, r4c3<>8
- Row 6 / Column 2 → 3 (Naked Single)
- Row 1 / Column 2 → 8 (Naked Single)
- Row 6 / Column 1 → 7 (Naked Single)
- Row 1 / Column 4 → 3 (Naked Single)
- Row 2 / Column 1 → 3 (Hidden Single)
- Row 3 / Column 4 → 8 (Hidden Single)
- Row 5 / Column 3 → 8 (Hidden Single)
- Row 5 / Column 5 → 6 (Naked Single)
- Row 6 / Column 5 → 1 (Naked Single)
- Row 4 / Column 5 → 8 (Naked Single)
- Row 6 / Column 3 → 9 (Naked Single)
- Row 6 / Column 9 → 6 (Full House)
- Row 4 / Column 9 → 9 (Full House)
- Row 4 / Column 3 → 1 (Naked Single)
- Row 7 / Column 7 → 8 (Hidden Single)
- Row 9 / Column 1 → 8 (Hidden Single)
- Row 8 / Column 3 → 7 (Hidden Single)
- Row 3 / Column 8 → 3 (Hidden Single)
- W-Wing: 6/1 in r1c6,r7c8 connected by 1 in r2c68 => r7c6<>6
- W-Wing: 9/6 in r2c4,r3c7 connected by 6 in r1c67 => r2c8,r3c6<>9
- Row 9 / Column 8 → 9 (Hidden Single)
- Row 3 / Column 7 → 9 (Hidden Single)
- X-Wing: 6 c48 r27 => r2c36,r7c2<>6
- Row 2 / Column 3 → 4 (Naked Single)
- Row 3 / Column 3 → 6 (Full House)
- Row 3 / Column 6 → 4 (Full House)
- Row 2 / Column 5 → 5 (Naked Single)
- Row 9 / Column 5 → 4 (Full House)
- Row 7 / Column 6 → 7 (Naked Single)
- Row 5 / Column 6 → 9 (Naked Single)
- Row 5 / Column 4 → 7 (Full House)
- Row 7 / Column 4 → 6 (Naked Single)
- Row 2 / Column 4 → 9 (Full House)
- Row 9 / Column 6 → 5 (Full House)
- Row 2 / Column 6 → 1 (Naked Single)
- Row 1 / Column 6 → 6 (Full House)
- Row 2 / Column 8 → 6 (Full House)
- Row 7 / Column 8 → 1 (Full House)
- Row 1 / Column 7 → 1 (Full House)
- Row 7 / Column 2 → 4 (Full House)
- Row 9 / Column 7 → 6 (Naked Single)
- Row 8 / Column 7 → 4 (Full House)
- Row 8 / Column 1 → 6 (Full House)
- Row 9 / Column 2 → 1 (Full House)
- Row 4 / Column 2 → 6 (Full House)
- Row 4 / Column 1 → 4 (Full House)
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