Solution for Hard Sudoku #2141756832918
2
6
7
3
1
5
8
4
9
8
1
4
6
7
9
2
3
5
3
5
9
8
4
2
6
7
1
4
5
3
7
2
1
6
9
8
9
2
7
4
8
6
1
5
3
1
8
6
5
9
3
7
2
4
1
7
6
9
3
4
5
8
2
5
4
2
7
6
8
3
9
1
9
3
8
2
1
5
4
6
7
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 2 / Column 2 → 1 (Hidden Single)
- Locked Triple: 1,5,7 in r456c7 => r37c7,r46c8,r5c9<>7, r5c9,r7c7<>5, r46c8<>1
- Row 5 / Column 9 → 3 (Naked Single)
- Row 5 / Column 3 → 1 (Naked Single)
- Locked Candidates Type 1 (Pointing): 8 in b4 => r3c3<>8
- Locked Candidates Type 1 (Pointing): 2 in b6 => r2c8<>2
- Locked Candidates Type 1 (Pointing): 8 in b6 => r78c8<>8
- Naked Pair: 5,7 in r5c17 => r5c46<>5, r5c6<>7
- X-Wing: 6 c37 r37 => r3c2568,r7c2458<>6
- Skyscraper: 6 in r1c2,r2c5 (connected by r8c25) => r1c46<>6
- Row 1 / Column 2 → 6 (Hidden Single)
- Row 3 / Column 7 → 6 (Hidden Single)
- Row 7 / Column 7 → 9 (Naked Single)
- Row 7 / Column 3 → 6 (Hidden Single)
- Row 3 / Column 2 → 4 (Hidden Single)
- Row 3 / Column 8 → 7 (Naked Single)
- Row 2 / Column 8 → 4 (Naked Single)
- Row 2 / Column 9 → 2 (Naked Single)
- Row 1 / Column 9 → 9 (Full House)
- Row 7 / Column 8 → 3 (Naked Single)
- Row 2 / Column 1 → 3 (Naked Single)
- Row 2 / Column 4 → 6 (Naked Single)
- Row 2 / Column 5 → 7 (Full House)
- Row 3 / Column 3 → 9 (Naked Single)
- Row 5 / Column 4 → 4 (Naked Single)
- Row 3 / Column 1 → 8 (Naked Single)
- Row 1 / Column 1 → 2 (Full House)
- Row 6 / Column 3 → 8 (Naked Single)
- Row 4 / Column 3 → 3 (Full House)
- Row 1 / Column 4 → 8 (Naked Single)
- Row 1 / Column 6 → 4 (Full House)
- Row 5 / Column 6 → 6 (Naked Single)
- Row 3 / Column 6 → 5 (Naked Single)
- Row 3 / Column 5 → 3 (Full House)
- Row 6 / Column 8 → 2 (Naked Single)
- Row 7 / Column 4 → 5 (Naked Single)
- Row 9 / Column 6 → 1 (Naked Single)
- Row 4 / Column 8 → 8 (Naked Single)
- Row 6 / Column 5 → 5 (Naked Single)
- Row 6 / Column 4 → 1 (Naked Single)
- Row 9 / Column 4 → 3 (Full House)
- Row 7 / Column 2 → 7 (Naked Single)
- Row 7 / Column 5 → 4 (Naked Single)
- Row 7 / Column 9 → 8 (Full House)
- Row 8 / Column 5 → 6 (Naked Single)
- Row 8 / Column 6 → 8 (Full House)
- Row 4 / Column 6 → 7 (Full House)
- Row 4 / Column 5 → 2 (Full House)
- Row 9 / Column 8 → 6 (Naked Single)
- Row 8 / Column 8 → 1 (Full House)
- Row 6 / Column 7 → 7 (Naked Single)
- Row 6 / Column 2 → 9 (Full House)
- Row 4 / Column 2 → 5 (Naked Single)
- Row 4 / Column 7 → 1 (Full House)
- Row 5 / Column 7 → 5 (Full House)
- Row 5 / Column 1 → 7 (Full House)
- Row 8 / Column 2 → 3 (Full House)
- Row 9 / Column 1 → 5 (Naked Single)
- Row 8 / Column 1 → 9 (Full House)
- Row 8 / Column 9 → 5 (Full House)
- Row 9 / Column 9 → 7 (Full House)
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