4
9
7
1
5
3
2
8
3
2
4
8
7
1
2
8
2
6
6
9
8
3
5
3
8
1
4
This Sudoku Puzzle has 61 steps and it is solved using Hidden Single, Locked Triple, Naked Single, Locked Candidates Type 1 (Pointing), Naked Pair, undefined, Skyscraper, Full House techniques.
Naked Single
Explanation
Hidden Single
Explanation
Locked Candidates
Explanation
Full House
Explanation
Solution Steps:
- Row 8 / Column 2 → 4 (Hidden Single)
- Locked Triple: 4,6,9 in r3c456 => r1c5,r2c46,r3c37<>6, r1c5,r3c7<>9, r2c46<>4
- Row 1 / Column 5 → 7 (Naked Single)
- Row 7 / Column 5 → 4 (Naked Single)
- Locked Candidates Type 1 (Pointing): 1 in b2 => r2c78<>1
- Locked Candidates Type 1 (Pointing): 8 in b2 => r2c2<>8
- Locked Candidates Type 1 (Pointing): 1 in b8 => r7c3<>1
- Naked Pair: 6,9 in r39c5 => r4c5<>6, r46c5<>9
- X-Wing: 5 r37 c37 => r2c37,r458c3,r568c7<>5
- Skyscraper: 5 in r5c2,r8c1 (connected by r58c8) => r46c1<>5
- Row 8 / Column 1 → 5 (Hidden Single)
- Row 7 / Column 7 → 5 (Hidden Single)
- Row 3 / Column 7 → 2 (Naked Single)
- Row 3 / Column 3 → 5 (Naked Single)
- Row 8 / Column 3 → 3 (Hidden Single)
- Row 2 / Column 3 → 6 (Naked Single)
- Row 1 / Column 2 → 8 (Naked Single)
- Row 2 / Column 2 → 3 (Naked Single)
- Row 1 / Column 1 → 2 (Full House)
- Row 2 / Column 7 → 7 (Naked Single)
- Row 9 / Column 2 → 7 (Naked Single)
- Row 6 / Column 2 → 5 (Naked Single)
- Row 5 / Column 2 → 6 (Full House)
- Row 7 / Column 3 → 2 (Naked Single)
- Row 6 / Column 5 → 3 (Naked Single)
- Row 7 / Column 6 → 1 (Naked Single)
- Row 7 / Column 4 → 7 (Full House)
- Row 9 / Column 3 → 1 (Naked Single)
- Row 9 / Column 1 → 8 (Full House)
- Row 4 / Column 5 → 5 (Naked Single)
- Row 6 / Column 1 → 1 (Naked Single)
- Row 4 / Column 1 → 3 (Full House)
- Row 2 / Column 6 → 8 (Naked Single)
- Row 4 / Column 3 → 9 (Naked Single)
- Row 5 / Column 3 → 7 (Full House)
- Row 6 / Column 7 → 9 (Naked Single)
- Row 2 / Column 4 → 1 (Naked Single)
- Row 5 / Column 6 → 9 (Naked Single)
- Row 4 / Column 9 → 4 (Naked Single)
- Row 5 / Column 7 → 3 (Naked Single)
- Row 5 / Column 8 → 5 (Naked Single)
- Row 5 / Column 4 → 8 (Full House)
- Row 6 / Column 6 → 4 (Naked Single)
- Row 4 / Column 4 → 6 (Full House)
- Row 4 / Column 8 → 1 (Full House)
- Row 6 / Column 9 → 7 (Full House)
- Row 8 / Column 7 → 6 (Naked Single)
- Row 1 / Column 7 → 1 (Full House)
- Row 2 / Column 9 → 5 (Naked Single)
- Row 2 / Column 8 → 4 (Full House)
- Row 3 / Column 6 → 6 (Naked Single)
- Row 8 / Column 6 → 2 (Full House)
- Row 8 / Column 4 → 9 (Naked Single)
- Row 3 / Column 4 → 4 (Full House)
- Row 3 / Column 5 → 9 (Full House)
- Row 8 / Column 8 → 7 (Full House)
- Row 9 / Column 5 → 6 (Full House)
- Row 1 / Column 8 → 9 (Naked Single)
- Row 1 / Column 9 → 6 (Full House)
- Row 9 / Column 9 → 9 (Full House)
- Row 9 / Column 8 → 2 (Full House)
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