9
6
7
3
2
7
6
1
9
8
4
6
9
5
1
2
3
7
1
9
4
4
8
This Sudoku Puzzle has 70 steps and it is solved using Naked Single, Hidden Single, Full House, Locked Candidates Type 1 (Pointing), Skyscraper, Naked Pair, undefined, Uniqueness Test 4, Hidden Rectangle, Locked Candidates Type 2 (Claiming), Uniqueness Test 6 techniques.
Naked Single
Explanation
Hidden Single
Explanation
Locked Candidates
Explanation
Locked Candidates
Explanation
Full House
Explanation
Solution Steps:
- Row 5 / Column 3 → 9 (Naked Single)
- Row 3 / Column 4 → 9 (Hidden Single)
- Row 5 / Column 2 → 1 (Hidden Single)
- Row 5 / Column 1 → 3 (Naked Single)
- Row 8 / Column 9 → 1 (Hidden Single)
- Row 7 / Column 3 → 6 (Hidden Single)
- Row 8 / Column 1 → 9 (Hidden Single)
- Row 3 / Column 5 → 6 (Hidden Single)
- Row 4 / Column 2 → 7 (Hidden Single)
- Row 4 / Column 5 → 3 (Naked Single)
- Row 9 / Column 5 → 5 (Naked Single)
- Row 9 / Column 2 → 2 (Naked Single)
- Row 7 / Column 1 → 5 (Naked Single)
- Row 6 / Column 1 → 2 (Naked Single)
- Row 6 / Column 3 → 5 (Full House)
- Row 7 / Column 2 → 8 (Naked Single)
- Row 8 / Column 2 → 4 (Full House)
- Row 2 / Column 2 → 5 (Full House)
- Row 3 / Column 1 → 1 (Hidden Single)
- Row 1 / Column 1 → 4 (Full House)
- Row 4 / Column 4 → 2 (Hidden Single)
- Row 2 / Column 4 → 4 (Hidden Single)
- Row 1 / Column 6 → 5 (Hidden Single)
- Row 5 / Column 6 → 6 (Hidden Single)
- Locked Candidates Type 1 (Pointing): 2 in b9 => r3c8<>2
- Skyscraper: 8 in r2c6,r5c5 (connected by r25c9) => r1c5,r6c6<>8
- Row 1 / Column 5 → 1 (Naked Single)
- Row 6 / Column 6 → 1 (Naked Single)
- Row 7 / Column 4 → 1 (Hidden Single)
- Locked Candidates Type 1 (Pointing): 7 in b8 => r8c78<>7
- Naked Pair: 5,6 in r48c7 => r3c7<>5, r9c7<>6
- 2-String Kite: 3 in r2c9,r9c4 (connected by r1c4,r2c6) => r9c9<>3
- Uniqueness Test 4: 2/8 in r1c39,r3c39 => r13c9<>8
- Hidden Rectangle: 3/9 in r6c79,r9c79 => r6c9<>3
- Locked Candidates Type 2 (Claiming): 3 in c9 => r1c7<>3
- Hidden Rectangle: 3/7 in r6c78,r7c78 => r6c8<>7
- XY-Chain: 7 7- r5c8 -4- r3c8 -5- r8c8 -2- r8c6 -8- r2c6 -3- r2c9 -8- r5c9 -7 => r5c5,r6c79<>7
- Uniqueness Test 6: 7/8 in r6c45,r8c45 => r6c5,r8c4<>7
- Row 6 / Column 4 → 7 (Hidden Single)
- Row 8 / Column 5 → 7 (Hidden Single)
- XY-Chain: 4 4- r5c8 -7- r5c9 -8- r2c9 -3- r2c6 -8- r1c4 -3- r9c4 -6- r9c9 -9- r6c9 -8- r6c5 -4 => r5c5,r6c78<>4
- Row 5 / Column 5 → 8 (Naked Single)
- Row 6 / Column 5 → 4 (Full House)
- Row 6 / Column 8 → 3 (Naked Single)
- Row 5 / Column 9 → 7 (Naked Single)
- Row 5 / Column 8 → 4 (Full House)
- Row 3 / Column 8 → 5 (Naked Single)
- Row 3 / Column 9 → 2 (Naked Single)
- Row 8 / Column 8 → 2 (Naked Single)
- Row 7 / Column 8 → 7 (Full House)
- Row 1 / Column 9 → 3 (Naked Single)
- Row 3 / Column 3 → 8 (Naked Single)
- Row 1 / Column 3 → 2 (Full House)
- Row 3 / Column 7 → 4 (Full House)
- Row 8 / Column 6 → 8 (Naked Single)
- Row 7 / Column 7 → 3 (Naked Single)
- Row 7 / Column 6 → 2 (Full House)
- Row 2 / Column 6 → 3 (Full House)
- Row 1 / Column 4 → 8 (Full House)
- Row 2 / Column 9 → 8 (Full House)
- Row 1 / Column 7 → 7 (Full House)
- Row 8 / Column 4 → 6 (Naked Single)
- Row 8 / Column 7 → 5 (Full House)
- Row 9 / Column 4 → 3 (Full House)
- Row 9 / Column 7 → 9 (Naked Single)
- Row 9 / Column 9 → 6 (Full House)
- Row 6 / Column 9 → 9 (Naked Single)
- Row 6 / Column 7 → 8 (Full House)
- Row 4 / Column 7 → 6 (Full House)
- Row 4 / Column 9 → 5 (Full House)
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