Solution for Hard Sudoku #2182619357418
7
9
6
5
2
1
3
8
4
3
2
8
9
6
4
7
5
1
5
1
4
3
8
7
9
6
2
8
1
5
6
7
2
9
4
3
4
7
6
8
3
9
2
1
5
2
3
9
1
4
5
6
7
8
2
6
9
4
5
8
1
3
7
1
8
7
6
9
3
5
4
2
4
5
3
7
2
1
8
9
6
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 → 2 (Hidden Single)
- Locked Triple: 1,2,6 in r456c7 => r37c7,r46c8,r5c9<>6, r5c9,r7c7<>1, r46c8<>2
- Row 5 / Column 9 → 5 (Naked Single)
- Row 5 / Column 3 → 2 (Naked Single)
- Locked Candidates Type 1 (Pointing): 3 in b4 => r3c3<>3
- Locked Candidates Type 1 (Pointing): 3 in b6 => r78c8<>3
- Locked Candidates Type 1 (Pointing): 7 in b6 => r2c8<>7
- Naked Pair: 1,6 in r5c17 => r5c46<>1, r5c6<>6
- X-Wing: 9 c37 r37 => r3c2568,r7c2458<>9
- Skyscraper: 9 in r1c2,r2c5 (connected by r8c25) => r1c46<>9
- Row 1 / Column 2 → 9 (Hidden Single)
- Row 3 / Column 7 → 9 (Hidden Single)
- Row 7 / Column 7 → 4 (Naked Single)
- Row 7 / Column 3 → 9 (Hidden Single)
- Row 3 / Column 2 → 8 (Hidden Single)
- Row 3 / Column 8 → 6 (Naked Single)
- Row 2 / Column 8 → 8 (Naked Single)
- Row 2 / Column 9 → 7 (Naked Single)
- Row 1 / Column 9 → 4 (Full House)
- Row 7 / Column 8 → 5 (Naked Single)
- Row 2 / Column 1 → 5 (Naked Single)
- Row 2 / Column 4 → 9 (Naked Single)
- Row 2 / Column 5 → 6 (Full House)
- Row 3 / Column 3 → 4 (Naked Single)
- Row 5 / Column 4 → 8 (Naked Single)
- Row 3 / Column 1 → 3 (Naked Single)
- Row 1 / Column 1 → 7 (Full House)
- Row 6 / Column 3 → 3 (Naked Single)
- Row 4 / Column 3 → 5 (Full House)
- Row 1 / Column 4 → 3 (Naked Single)
- Row 1 / Column 6 → 8 (Full House)
- Row 5 / Column 6 → 9 (Naked Single)
- Row 3 / Column 6 → 1 (Naked Single)
- Row 3 / Column 5 → 5 (Full House)
- Row 6 / Column 8 → 7 (Naked Single)
- Row 7 / Column 4 → 1 (Naked Single)
- Row 9 / Column 6 → 2 (Naked Single)
- Row 4 / Column 8 → 3 (Naked Single)
- Row 6 / Column 5 → 1 (Naked Single)
- Row 6 / Column 4 → 2 (Naked Single)
- Row 9 / Column 4 → 5 (Full House)
- Row 7 / Column 2 → 6 (Naked Single)
- Row 7 / Column 5 → 8 (Naked Single)
- Row 7 / Column 9 → 3 (Full House)
- Row 8 / Column 5 → 9 (Naked Single)
- Row 8 / Column 6 → 3 (Full House)
- Row 4 / Column 6 → 6 (Full House)
- Row 4 / Column 5 → 7 (Full House)
- Row 9 / Column 8 → 9 (Naked Single)
- Row 8 / Column 8 → 2 (Full House)
- Row 6 / Column 7 → 6 (Naked Single)
- Row 6 / Column 2 → 4 (Full House)
- Row 4 / Column 2 → 1 (Naked Single)
- Row 4 / Column 7 → 2 (Full House)
- Row 5 / Column 7 → 1 (Full House)
- Row 5 / Column 1 → 6 (Full House)
- Row 8 / Column 2 → 5 (Full House)
- Row 9 / Column 1 → 1 (Naked Single)
- Row 8 / Column 1 → 4 (Full House)
- Row 8 / Column 9 → 1 (Full House)
- Row 9 / Column 9 → 6 (Full House)
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