1
5
8
3
2
9
7
6
4
9
6
4
5
8
7
3
1
2
7
2
3
1
4
6
9
8
5
2
4
6
9
7
3
5
8
1
8
7
9
1
4
5
6
2
3
3
5
1
8
6
2
4
9
7
6
3
5
8
9
7
4
1
2
4
9
1
2
3
6
7
5
8
2
7
8
5
1
4
6
3
9
This Sudoku Puzzle has 68 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Naked Single, Locked Pair, Full House, Locked Candidates Type 2 (Claiming), Naked Pair, Naked Triple, Skyscraper techniques.
Naked Single
Explanation
Hidden Single
Explanation
Locked Candidates
Explanation
Locked Candidates
Explanation
Full House
Explanation
Solution Steps:
- Row 4 / Column 7 → 3 (Hidden Single)
- Row 5 / Column 1 → 9 (Hidden Single)
- Row 2 / Column 3 → 9 (Hidden Single)
- Row 9 / Column 9 → 9 (Hidden Single)
- Locked Candidates Type 1 (Pointing): 6 in b1 => r45c2<>6
- Locked Candidates Type 1 (Pointing): 4 in b2 => r1c78<>4
- Locked Candidates Type 1 (Pointing): 5 in b9 => r8c1356<>5
- Row 8 / Column 3 → 7 (Naked Single)
- Locked Pair: 4,5 in r8c79 => r79c8,r8c146<>4
- Row 2 / Column 8 → 4 (Hidden Single)
- Row 2 / Column 7 → 1 (Naked Single)
- Row 2 / Column 1 → 3 (Naked Single)
- Row 2 / Column 9 → 6 (Naked Single)
- Row 2 / Column 5 → 8 (Full House)
- Row 8 / Column 1 → 8 (Naked Single)
- Row 3 / Column 9 → 5 (Naked Single)
- Row 3 / Column 7 → 9 (Naked Single)
- Row 8 / Column 9 → 4 (Naked Single)
- Row 1 / Column 7 → 7 (Naked Single)
- Row 8 / Column 7 → 5 (Naked Single)
- Row 6 / Column 7 → 4 (Full House)
- Row 1 / Column 8 → 2 (Naked Single)
- Row 3 / Column 8 → 8 (Full House)
- Row 5 / Column 8 → 6 (Hidden Single)
- Row 4 / Column 4 → 8 (Hidden Single)
- Row 9 / Column 6 → 8 (Hidden Single)
- Row 1 / Column 4 → 9 (Hidden Single)
- Row 1 / Column 6 → 4 (Hidden Single)
- Locked Candidates Type 2 (Claiming): 3 in r8 => r79c4,r9c5<>3
- Naked Pair: 1,5 in r7c36 => r7c24<>1, r7c2<>5
- Naked Pair: 1,5 in r57c6 => r3c6<>1
- Naked Triple: 1,4,7 in r579c4 => r36c4<>1, r6c4<>7
- Locked Candidates Type 1 (Pointing): 1 in b2 => r469c5<>1
- Locked Candidates Type 1 (Pointing): 1 in b5 => r5c2<>1
- Skyscraper: 5 in r5c2,r7c3 (connected by r57c6) => r6c3,r9c2<>5
- Row 7 / Column 3 → 5 (Hidden Single)
- Row 7 / Column 6 → 1 (Naked Single)
- Row 5 / Column 6 → 5 (Naked Single)
- Row 5 / Column 2 → 7 (Naked Single)
- Row 5 / Column 4 → 1 (Full House)
- Row 9 / Column 5 → 5 (Hidden Single)
- Row 1 / Column 2 → 5 (Hidden Single)
- Row 1 / Column 1 → 1 (Naked Single)
- Row 1 / Column 5 → 6 (Full House)
- Row 3 / Column 2 → 6 (Full House)
- Row 9 / Column 1 → 4 (Naked Single)
- Row 3 / Column 6 → 2 (Naked Single)
- Row 8 / Column 6 → 6 (Full House)
- Row 4 / Column 1 → 2 (Naked Single)
- Row 6 / Column 1 → 5 (Full House)
- Row 7 / Column 2 → 3 (Naked Single)
- Row 9 / Column 2 → 1 (Full House)
- Row 4 / Column 2 → 4 (Full House)
- Row 9 / Column 4 → 7 (Naked Single)
- Row 9 / Column 8 → 3 (Full House)
- Row 7 / Column 8 → 7 (Full House)
- Row 7 / Column 4 → 4 (Full House)
- Row 3 / Column 4 → 3 (Naked Single)
- Row 3 / Column 5 → 1 (Full House)
- Row 4 / Column 5 → 7 (Naked Single)
- Row 8 / Column 4 → 2 (Naked Single)
- Row 6 / Column 4 → 6 (Full House)
- Row 6 / Column 5 → 2 (Full House)
- Row 8 / Column 5 → 3 (Full House)
- Row 4 / Column 9 → 1 (Naked Single)
- Row 4 / Column 3 → 6 (Full House)
- Row 6 / Column 3 → 1 (Full House)
- Row 6 / Column 9 → 7 (Full House)
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