Solution for Hard Sudoku #3224387159618
8
6
4
1
5
3
9
2
7
7
3
2
6
9
8
1
4
5
1
5
9
2
4
7
6
8
3
5
3
8
6
7
2
4
1
9
4
2
6
8
1
9
5
7
3
9
7
1
5
3
4
8
6
2
2
9
6
7
4
5
3
8
1
3
8
4
9
6
1
2
5
7
7
1
5
3
2
8
4
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 8 → 4 (Hidden Single)
- Locked Triple: 3,4,8 in r7c456 => r7c37,r8c46,r9c5<>3, r7c3,r9c5<>8, r8c46<>4
- Row 9 / Column 5 → 5 (Naked Single)
- Row 3 / Column 5 → 4 (Naked Single)
- Locked Candidates Type 1 (Pointing): 1 in b2 => r3c7<>1
- Locked Candidates Type 1 (Pointing): 1 in b8 => r8c23<>1
- Locked Candidates Type 1 (Pointing): 9 in b8 => r8c8<>9
- Naked Pair: 3,8 in r17c5 => r46c5<>8, r6c5<>3
- X-Wing: 7 r37 c37 => r2c37,r458c3,r568c7<>7
- Skyscraper: 7 in r2c9,r5c8 (connected by r25c2) => r46c9<>7
- Row 2 / Column 9 → 7 (Hidden Single)
- Row 3 / Column 3 → 7 (Hidden Single)
- Row 7 / Column 3 → 6 (Naked Single)
- Row 7 / Column 7 → 7 (Naked Single)
- Row 2 / Column 7 → 2 (Hidden Single)
- Row 8 / Column 7 → 3 (Naked Single)
- Row 8 / Column 3 → 5 (Naked Single)
- Row 8 / Column 8 → 2 (Naked Single)
- Row 9 / Column 8 → 9 (Naked Single)
- Row 9 / Column 9 → 6 (Full House)
- Row 1 / Column 8 → 5 (Naked Single)
- Row 3 / Column 7 → 6 (Naked Single)
- Row 4 / Column 8 → 7 (Naked Single)
- Row 5 / Column 8 → 3 (Full House)
- Row 1 / Column 7 → 1 (Naked Single)
- Row 1 / Column 9 → 9 (Full House)
- Row 3 / Column 4 → 1 (Naked Single)
- Row 3 / Column 6 → 5 (Full House)
- Row 4 / Column 5 → 2 (Naked Single)
- Row 6 / Column 7 → 8 (Naked Single)
- Row 5 / Column 7 → 5 (Full House)
- Row 8 / Column 4 → 9 (Naked Single)
- Row 4 / Column 9 → 1 (Naked Single)
- Row 6 / Column 9 → 2 (Full House)
- Row 6 / Column 5 → 7 (Naked Single)
- Row 5 / Column 4 → 8 (Naked Single)
- Row 8 / Column 6 → 1 (Naked Single)
- Row 4 / Column 3 → 8 (Naked Single)
- Row 6 / Column 1 → 4 (Naked Single)
- Row 4 / Column 4 → 4 (Naked Single)
- Row 4 / Column 1 → 5 (Full House)
- Row 5 / Column 2 → 7 (Naked Single)
- Row 5 / Column 3 → 2 (Naked Single)
- Row 5 / Column 6 → 9 (Full House)
- Row 6 / Column 2 → 1 (Full House)
- Row 6 / Column 6 → 3 (Full House)
- Row 2 / Column 3 → 3 (Naked Single)
- Row 9 / Column 3 → 1 (Full House)
- Row 8 / Column 1 → 7 (Naked Single)
- Row 8 / Column 2 → 4 (Full House)
- Row 7 / Column 4 → 3 (Naked Single)
- Row 2 / Column 4 → 6 (Full House)
- Row 9 / Column 2 → 8 (Naked Single)
- Row 9 / Column 1 → 3 (Full House)
- Row 1 / Column 1 → 8 (Full House)
- Row 2 / Column 6 → 8 (Naked Single)
- Row 2 / Column 2 → 5 (Full House)
- Row 1 / Column 2 → 6 (Full House)
- Row 1 / Column 5 → 3 (Full House)
- Row 7 / Column 5 → 8 (Full House)
- Row 7 / Column 6 → 4 (Full House)
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