3
1
5
2
9
8
7
4
6
2
9
6
4
5
7
3
1
8
4
8
7
1
3
6
2
9
5
9
6
2
4
8
3
1
5
7
7
3
5
1
6
9
8
2
4
8
1
4
7
5
2
3
6
9
6
7
4
5
3
1
8
2
9
5
8
1
9
4
2
6
7
3
9
2
3
6
7
8
5
4
1
This Sudoku Puzzle has 69 steps and it is solved using Hidden Single, Locked Pair, Locked Candidates Type 1 (Pointing), Naked Single, Locked Candidates Type 2 (Claiming), undefined, Naked Pair, Full House techniques.
Naked Single
Explanation
Hidden Single
Explanation
Locked Candidates
Explanation
Locked Candidates
Explanation
Full House
Explanation
Solution Steps:
- Row 5 / Column 8 → 5 (Hidden Single)
- Row 5 / Column 6 → 9 (Hidden Single)
- Row 8 / Column 5 → 4 (Hidden Single)
- Row 4 / Column 9 → 4 (Hidden Single)
- Row 2 / Column 5 → 5 (Hidden Single)
- Row 7 / Column 4 → 5 (Hidden Single)
- Locked Pair: 6,8 in r8c79 => r7c78,r8c168,r9c8<>6, r8c138,r9c8<>8
- Locked Candidates Type 1 (Pointing): 9 in b4 => r23c1<>9
- Locked Candidates Type 1 (Pointing): 8 in b5 => r13c4<>8
- Locked Pair: 1,3 in r3c45 => r1c46,r23c6,r3c128<>1, r1c46,r3c16<>3
- Row 1 / Column 1 → 3 (Hidden Single)
- Row 9 / Column 6 → 3 (Hidden Single)
- Row 1 / Column 3 → 5 (Hidden Single)
- Row 8 / Column 1 → 5 (Hidden Single)
- Row 7 / Column 3 → 4 (Hidden Single)
- Row 7 / Column 7 → 9 (Naked Single)
- Row 1 / Column 7 → 4 (Hidden Single)
- Row 9 / Column 8 → 4 (Hidden Single)
- Row 3 / Column 2 → 4 (Hidden Single)
- Row 3 / Column 8 → 9 (Hidden Single)
- Row 2 / Column 2 → 9 (Hidden Single)
- Row 6 / Column 9 → 9 (Hidden Single)
- Row 4 / Column 1 → 9 (Hidden Single)
- Row 7 / Column 2 → 7 (Hidden Single)
- Row 7 / Column 8 → 2 (Naked Single)
- Row 8 / Column 8 → 7 (Naked Single)
- Locked Candidates Type 1 (Pointing): 6 in b6 => r6c45<>6
- Row 5 / Column 5 → 6 (Hidden Single)
- Locked Candidates Type 2 (Claiming): 2 in c5 => r6c4<>2
- X-Wing: 2 c24 r19 => r1c6,r9c1<>2
- W-Wing: 8/1 in r4c8,r5c2 connected by 1 in r1c28 => r4c3<>8
- Locked Candidates Type 2 (Claiming): 8 in r4 => r6c78<>8
- Naked Pair: 1,2 in r48c3 => r26c3<>1, r26c3<>2
- Naked Pair: 7,8 in r2c3,r3c1 => r1c2,r2c1<>8, r2c1<>7
- W-Wing: 1/2 in r1c2,r4c3 connected by 2 in r26c1 => r5c2<>1
- Row 5 / Column 2 → 8 (Naked Single)
- Row 5 / Column 4 → 1 (Full House)
- Row 6 / Column 3 → 7 (Naked Single)
- Row 9 / Column 2 → 2 (Naked Single)
- Row 1 / Column 2 → 1 (Full House)
- Row 3 / Column 4 → 3 (Naked Single)
- Row 2 / Column 3 → 8 (Naked Single)
- Row 8 / Column 3 → 1 (Naked Single)
- Row 4 / Column 3 → 2 (Full House)
- Row 6 / Column 1 → 1 (Full House)
- Row 9 / Column 4 → 6 (Naked Single)
- Row 9 / Column 1 → 8 (Full House)
- Row 7 / Column 1 → 6 (Full House)
- Row 7 / Column 6 → 1 (Full House)
- Row 8 / Column 6 → 2 (Full House)
- Row 2 / Column 1 → 2 (Naked Single)
- Row 3 / Column 1 → 7 (Full House)
- Row 3 / Column 5 → 1 (Naked Single)
- Row 3 / Column 6 → 8 (Full House)
- Row 6 / Column 4 → 8 (Naked Single)
- Row 1 / Column 4 → 2 (Full House)
- Row 2 / Column 9 → 6 (Naked Single)
- Row 8 / Column 9 → 8 (Full House)
- Row 8 / Column 7 → 6 (Full House)
- Row 4 / Column 5 → 3 (Naked Single)
- Row 6 / Column 5 → 2 (Full House)
- Row 6 / Column 8 → 6 (Naked Single)
- Row 6 / Column 7 → 3 (Full House)
- Row 1 / Column 6 → 6 (Naked Single)
- Row 1 / Column 8 → 8 (Full House)
- Row 2 / Column 6 → 7 (Full House)
- Row 2 / Column 7 → 1 (Full House)
- Row 4 / Column 8 → 1 (Full House)
- Row 4 / Column 7 → 8 (Full House)
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