5
2
8
7
1
9
3
4
6
4
6
7
2
3
8
5
1
9
9
1
3
5
4
6
7
2
8
8
9
3
2
6
7
1
5
4
7
2
5
3
4
1
8
9
6
4
6
1
8
9
5
3
7
2
4
7
1
6
3
5
9
8
2
6
8
3
9
7
2
1
5
4
2
5
9
1
8
4
6
3
7
This Sudoku Puzzle has 67 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Locked Pair, Naked Single, Full House, Uniqueness Test 3, Discontinuous Nice Loop, Sue de Coq, Turbot Fish, undefined techniques.
Naked Single
Explanation
Hidden Single
Explanation
Locked Candidates
Explanation
Locked Candidates
Explanation
Full House
Explanation
Solution Steps:
- Row 2 / Column 8 → 4 (Hidden Single)
- Row 9 / Column 5 → 5 (Hidden Single)
- Locked Candidates Type 1 (Pointing): 6 in b8 => r7c7<>6
- Locked Candidates Type 1 (Pointing): 7 in b8 => r8c78<>7
- Locked Candidates Type 2 (Claiming): 6 in c6 => r4c45,r6c4<>6
- Locked Pair: 2,7 in r4c45 => r4c236,r5c56<>2, r4c38,r5c5,r6c4<>7
- Row 4 / Column 3 → 3 (Naked Single)
- Row 9 / Column 3 → 2 (Naked Single)
- Row 5 / Column 1 → 2 (Hidden Single)
- Row 1 / Column 1 → 5 (Hidden Single)
- Row 4 / Column 2 → 9 (Hidden Single)
- Row 4 / Column 8 → 6 (Naked Single)
- Row 4 / Column 6 → 5 (Naked Single)
- Row 5 / Column 9 → 5 (Hidden Single)
- Row 2 / Column 7 → 5 (Hidden Single)
- Row 6 / Column 2 → 5 (Hidden Single)
- Row 6 / Column 6 → 6 (Hidden Single)
- Row 9 / Column 7 → 6 (Hidden Single)
- Locked Candidates Type 1 (Pointing): 4 in b4 => r137c3<>4
- Row 7 / Column 3 → 1 (Naked Single)
- Row 8 / Column 2 → 3 (Naked Single)
- Row 9 / Column 1 → 9 (Naked Single)
- Row 7 / Column 1 → 4 (Full House)
- Row 3 / Column 1 → 3 (Full House)
- Row 8 / Column 7 → 1 (Hidden Single)
- Row 2 / Column 5 → 3 (Hidden Single)
- Row 7 / Column 7 → 2 (Hidden Single)
- Locked Pair: 7,8 in r3c79 => r1c79,r3c35<>8
- Row 3 / Column 3 → 6 (Naked Single)
- Row 1 / Column 3 → 8 (Naked Single)
- Uniqueness Test 3: 2/7 in r4c45,r8c45 => r8c6<>8
- Row 8 / Column 6 → 2 (Naked Single)
- Discontinuous Nice Loop: 7 r5c7 -7- r3c7 -8- r3c9 =8= r7c9 =9= r1c9 -9- r1c7 =9= r5c7 => r5c7<>7
- Sue de Coq: r56c8 - {3789} (r9c8 - {37}, r5c7 - {89}) => r6c7<>8
- Turbot Fish: 8 r6c4 =8= r6c8 -8- r8c8 =8= r7c9 => r7c4<>8
- XY-Chain: 8 8- r5c7 -9- r1c7 -3- r6c7 -7- r6c3 -4- r6c4 -8 => r5c56,r6c8<>8
- Row 5 / Column 6 → 1 (Naked Single)
- Row 2 / Column 6 → 8 (Full House)
- Row 5 / Column 5 → 4 (Naked Single)
- Row 2 / Column 4 → 2 (Naked Single)
- Row 2 / Column 2 → 1 (Full House)
- Row 3 / Column 5 → 1 (Naked Single)
- Row 5 / Column 3 → 7 (Naked Single)
- Row 6 / Column 3 → 4 (Full House)
- Row 6 / Column 4 → 8 (Naked Single)
- Row 1 / Column 5 → 6 (Naked Single)
- Row 1 / Column 4 → 4 (Full House)
- Row 4 / Column 4 → 7 (Naked Single)
- Row 4 / Column 5 → 2 (Full House)
- Row 3 / Column 2 → 4 (Naked Single)
- Row 1 / Column 2 → 2 (Full House)
- Row 7 / Column 5 → 8 (Naked Single)
- Row 8 / Column 5 → 7 (Full House)
- Row 8 / Column 4 → 9 (Naked Single)
- Row 7 / Column 4 → 6 (Full House)
- Row 7 / Column 9 → 9 (Full House)
- Row 8 / Column 8 → 8 (Full House)
- Row 1 / Column 9 → 3 (Naked Single)
- Row 1 / Column 7 → 9 (Full House)
- Row 5 / Column 8 → 9 (Naked Single)
- Row 5 / Column 7 → 8 (Full House)
- Row 9 / Column 9 → 7 (Naked Single)
- Row 3 / Column 9 → 8 (Full House)
- Row 3 / Column 7 → 7 (Full House)
- Row 9 / Column 8 → 3 (Full House)
- Row 6 / Column 7 → 3 (Full House)
- Row 6 / Column 8 → 7 (Full House)
Show More...