Solution for Hard Sudoku #4154372186918
7
1
6
9
8
5
4
3
2
8
9
4
3
2
1
7
5
6
5
2
3
6
4
7
9
8
1
2
9
1
3
6
4
5
7
8
4
7
8
5
1
2
9
6
3
3
6
5
7
9
8
4
1
2
1
5
9
8
4
7
6
2
3
6
8
7
2
3
9
1
4
5
2
3
4
1
5
6
8
7
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 8 / Column 2 → 4 (Hidden Single)
- Locked Triple: 3,4,7 in r456c7 => r37c7,r46c8,r5c9<>3, r3c7,r5c9<>7, r46c8<>4
- Row 5 / Column 9 → 8 (Naked Single)
- Row 5 / Column 3 → 4 (Naked Single)
- Locked Candidates Type 1 (Pointing): 1 in b4 => r7c3<>1
- Locked Candidates Type 1 (Pointing): 1 in b6 => r23c8<>1
- Locked Candidates Type 1 (Pointing): 6 in b6 => r8c8<>6
- Naked Pair: 3,7 in r5c17 => r5c46<>7, r5c6<>3
- X-Wing: 2 c37 r37 => r3c2458,r7c2568<>2
- Skyscraper: 2 in r8c5,r9c2 (connected by r2c25) => r9c46<>2
- Row 9 / Column 2 → 2 (Hidden Single)
- Row 3 / Column 3 → 2 (Hidden Single)
- Row 3 / Column 7 → 9 (Naked Single)
- Row 7 / Column 7 → 2 (Naked Single)
- Row 7 / Column 2 → 5 (Hidden Single)
- Row 7 / Column 8 → 3 (Naked Single)
- Row 3 / Column 8 → 8 (Naked Single)
- Row 8 / Column 8 → 5 (Naked Single)
- Row 8 / Column 9 → 6 (Naked Single)
- Row 9 / Column 9 → 9 (Full House)
- Row 8 / Column 1 → 8 (Naked Single)
- Row 7 / Column 3 → 9 (Naked Single)
- Row 8 / Column 4 → 2 (Naked Single)
- Row 8 / Column 5 → 3 (Full House)
- Row 4 / Column 3 → 1 (Naked Single)
- Row 6 / Column 3 → 8 (Full House)
- Row 7 / Column 1 → 1 (Naked Single)
- Row 9 / Column 1 → 6 (Full House)
- Row 5 / Column 4 → 5 (Naked Single)
- Row 4 / Column 8 → 6 (Naked Single)
- Row 7 / Column 6 → 7 (Naked Single)
- Row 7 / Column 5 → 8 (Full House)
- Row 5 / Column 6 → 2 (Naked Single)
- Row 9 / Column 4 → 1 (Naked Single)
- Row 9 / Column 6 → 5 (Full House)
- Row 4 / Column 5 → 7 (Naked Single)
- Row 6 / Column 8 → 1 (Naked Single)
- Row 1 / Column 6 → 4 (Naked Single)
- Row 3 / Column 4 → 7 (Naked Single)
- Row 2 / Column 5 → 2 (Naked Single)
- Row 3 / Column 5 → 5 (Naked Single)
- Row 6 / Column 5 → 6 (Full House)
- Row 4 / Column 4 → 4 (Naked Single)
- Row 6 / Column 6 → 3 (Full House)
- Row 2 / Column 6 → 1 (Full House)
- Row 1 / Column 4 → 8 (Full House)
- Row 1 / Column 8 → 2 (Naked Single)
- Row 2 / Column 8 → 4 (Full House)
- Row 3 / Column 2 → 3 (Naked Single)
- Row 3 / Column 9 → 1 (Full House)
- Row 4 / Column 7 → 3 (Naked Single)
- Row 4 / Column 2 → 9 (Full House)
- Row 6 / Column 2 → 7 (Naked Single)
- Row 2 / Column 2 → 8 (Full House)
- Row 5 / Column 1 → 3 (Full House)
- Row 5 / Column 7 → 7 (Full House)
- Row 6 / Column 7 → 4 (Full House)
- Row 2 / Column 9 → 7 (Naked Single)
- Row 1 / Column 9 → 3 (Full House)
- Row 1 / Column 1 → 7 (Full House)
- Row 2 / Column 1 → 9 (Full House)
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