Solution for Hard Sudoku #1424937581618
1
8
5
7
4
2
9
3
6
2
9
7
3
1
6
8
4
5
4
6
3
9
8
5
7
2
1
5
7
1
4
9
8
2
6
3
6
2
4
1
5
3
9
7
8
3
9
8
2
7
6
1
5
4
8
5
7
3
2
9
6
1
4
4
3
9
5
6
1
7
8
2
6
1
2
8
4
7
5
3
9
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 → 4 (Hidden Single)
- Locked Triple: 3,4,9 in r7c456 => r7c37,r8c46,r9c5<>9, r7c7,r9c5<>3, r8c46<>4
- Row 9 / Column 5 → 8 (Naked Single)
- Row 3 / Column 5 → 4 (Naked Single)
- Locked Candidates Type 1 (Pointing): 5 in b2 => r3c3<>5
- Locked Candidates Type 1 (Pointing): 1 in b8 => r8c2<>1
- Locked Candidates Type 1 (Pointing): 5 in b8 => r8c78<>5
- Naked Pair: 3,9 in r17c5 => r46c5<>3, r6c5<>9
- X-Wing: 7 r37 c37 => r2c37,r458c7,r568c3<>7
- Skyscraper: 7 in r2c1,r5c2 (connected by r25c8) => r46c1<>7
- Row 2 / Column 1 → 7 (Hidden Single)
- Row 3 / Column 7 → 7 (Hidden Single)
- Row 7 / Column 7 → 6 (Naked Single)
- Row 7 / Column 3 → 7 (Naked Single)
- Row 2 / Column 3 → 2 (Hidden Single)
- Row 8 / Column 3 → 9 (Naked Single)
- Row 8 / Column 2 → 2 (Naked Single)
- Row 8 / Column 7 → 8 (Naked Single)
- Row 9 / Column 2 → 1 (Naked Single)
- Row 9 / Column 1 → 6 (Full House)
- Row 1 / Column 2 → 8 (Naked Single)
- Row 3 / Column 3 → 6 (Naked Single)
- Row 4 / Column 2 → 7 (Naked Single)
- Row 5 / Column 2 → 9 (Full House)
- Row 1 / Column 3 → 5 (Naked Single)
- Row 1 / Column 1 → 1 (Full House)
- Row 3 / Column 6 → 5 (Naked Single)
- Row 3 / Column 4 → 8 (Full House)
- Row 4 / Column 5 → 2 (Naked Single)
- Row 6 / Column 3 → 3 (Naked Single)
- Row 5 / Column 3 → 8 (Full House)
- Row 8 / Column 6 → 1 (Naked Single)
- Row 4 / Column 1 → 5 (Naked Single)
- Row 6 / Column 1 → 2 (Full House)
- Row 6 / Column 5 → 7 (Naked Single)
- Row 5 / Column 6 → 3 (Naked Single)
- Row 8 / Column 4 → 5 (Naked Single)
- Row 4 / Column 7 → 3 (Naked Single)
- Row 6 / Column 9 → 4 (Naked Single)
- Row 4 / Column 6 → 4 (Naked Single)
- Row 4 / Column 9 → 8 (Full House)
- Row 5 / Column 4 → 1 (Naked Single)
- Row 6 / Column 4 → 9 (Full House)
- Row 6 / Column 8 → 5 (Full House)
- Row 5 / Column 7 → 2 (Naked Single)
- Row 5 / Column 8 → 7 (Full House)
- Row 2 / Column 7 → 9 (Naked Single)
- Row 9 / Column 7 → 5 (Full House)
- Row 8 / Column 9 → 7 (Naked Single)
- Row 8 / Column 8 → 4 (Full House)
- Row 7 / Column 6 → 9 (Naked Single)
- Row 2 / Column 6 → 6 (Full House)
- Row 2 / Column 4 → 3 (Naked Single)
- Row 1 / Column 5 → 9 (Full House)
- Row 7 / Column 5 → 3 (Full House)
- Row 2 / Column 8 → 8 (Full House)
- Row 7 / Column 4 → 4 (Full House)
- Row 9 / Column 8 → 3 (Naked Single)
- Row 1 / Column 8 → 6 (Full House)
- Row 1 / Column 9 → 3 (Full House)
- Row 9 / Column 9 → 9 (Full House)
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