1
6
2
8
4
3
5
7
9
3
5
8
2
7
9
4
6
1
4
9
7
1
5
6
8
3
2
7
1
4
3
5
6
9
2
8
9
3
5
7
8
2
1
4
6
6
2
8
9
1
4
3
7
5
4
8
7
2
3
5
6
9
1
5
9
3
6
1
4
8
2
7
2
6
1
7
8
9
5
4
3
This Sudoku Puzzle has 68 steps and it is solved using Hidden Single, Naked Single, Full House, Locked Candidates Type 1 (Pointing), Naked Triple, undefined techniques.
Naked Single
Explanation
Hidden Single
Explanation
Locked Candidates
Explanation
Full House
Explanation
Solution Steps:
- Row 5 / Column 7 → 9 (Hidden Single)
- Row 7 / Column 5 → 9 (Hidden Single)
- Row 5 / Column 5 → 8 (Hidden Single)
- Row 8 / Column 8 → 8 (Hidden Single)
- Row 2 / Column 4 → 2 (Hidden Single)
- Row 9 / Column 5 → 2 (Hidden Single)
- Row 5 / Column 9 → 4 (Hidden Single)
- Row 7 / Column 2 → 8 (Hidden Single)
- Row 4 / Column 4 → 9 (Hidden Single)
- Row 6 / Column 5 → 4 (Hidden Single)
- Row 9 / Column 9 → 3 (Hidden Single)
- Row 6 / Column 7 → 3 (Hidden Single)
- Row 6 / Column 4 → 1 (Hidden Single)
- Row 4 / Column 5 → 3 (Hidden Single)
- Row 6 / Column 6 → 6 (Hidden Single)
- Row 5 / Column 4 → 7 (Naked Single)
- Row 4 / Column 6 → 5 (Full House)
- Row 8 / Column 4 → 6 (Full House)
- Row 5 / Column 1 → 3 (Hidden Single)
- Row 5 / Column 2 → 5 (Naked Single)
- Row 5 / Column 3 → 6 (Full House)
- Row 9 / Column 1 → 6 (Hidden Single)
- Locked Candidates Type 1 (Pointing): 2 in b4 => r3c2<>2
- Locked Candidates Type 1 (Pointing): 7 in b6 => r29c8<>7
- Locked Candidates Type 1 (Pointing): 5 in b7 => r123c3<>5
- Locked Candidates Type 1 (Pointing): 7 in b8 => r123c6<>7
- Naked Triple: 1,2,7 in r346c2 => r2c2<>1, r28c2<>7
- X-Wing: 4 r17 c17 => r289c7<>4
- Naked Triple: 1,5,7 in r289c7 => r137c7<>1, r13c7<>5, r137c7<>7
- Locked Candidates Type 1 (Pointing): 5 in b3 => r2c5<>5
- XY-Wing: 5/7/4 in r8c67,r9c8 => r9c6<>4
- Row 9 / Column 6 → 7 (Naked Single)
- Row 8 / Column 6 → 4 (Full House)
- Row 8 / Column 2 → 3 (Naked Single)
- Row 2 / Column 2 → 4 (Naked Single)
- Row 2 / Column 8 → 5 (Naked Single)
- Row 9 / Column 8 → 4 (Naked Single)
- Row 7 / Column 7 → 2 (Naked Single)
- Row 3 / Column 7 → 8 (Naked Single)
- Row 1 / Column 7 → 4 (Naked Single)
- Row 7 / Column 1 → 4 (Hidden Single)
- Row 2 / Column 3 → 3 (Hidden Single)
- Row 1 / Column 6 → 8 (Hidden Single)
- Row 2 / Column 6 → 9 (Hidden Single)
- Row 3 / Column 6 → 1 (Full House)
- Row 3 / Column 2 → 7 (Naked Single)
- Row 3 / Column 1 → 5 (Naked Single)
- Row 6 / Column 2 → 2 (Naked Single)
- Row 4 / Column 2 → 1 (Full House)
- Row 6 / Column 8 → 7 (Full House)
- Row 4 / Column 1 → 7 (Full House)
- Row 1 / Column 1 → 1 (Full House)
- Row 4 / Column 8 → 2 (Full House)
- Row 3 / Column 5 → 6 (Naked Single)
- Row 1 / Column 3 → 2 (Naked Single)
- Row 3 / Column 3 → 9 (Full House)
- Row 3 / Column 9 → 2 (Full House)
- Row 2 / Column 5 → 7 (Naked Single)
- Row 1 / Column 5 → 5 (Full House)
- Row 1 / Column 9 → 7 (Full House)
- Row 2 / Column 7 → 1 (Naked Single)
- Row 2 / Column 9 → 6 (Full House)
- Row 7 / Column 9 → 1 (Full House)
- Row 7 / Column 3 → 7 (Full House)
- Row 9 / Column 7 → 5 (Naked Single)
- Row 8 / Column 7 → 7 (Full House)
- Row 8 / Column 3 → 5 (Full House)
- Row 9 / Column 3 → 1 (Full House)
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