4
9
1
3
2
6
4
6
5
8
2
3
8
1
2
9
8
9
2
2
4
6
8
5
This Sudoku Puzzle has 65 steps and it is solved using Hidden Single, Locked Pair, Locked Candidates Type 1 (Pointing), Naked Single, Full House, Naked Triple, undefined techniques.
Naked Single
Explanation
Hidden Single
Explanation
Locked Candidates
Explanation
Full House
Explanation
Solution Steps:
- Row 6 / Column 3 → 2 (Hidden Single)
- Row 7 / Column 8 → 2 (Hidden Single)
- Row 3 / Column 2 → 2 (Hidden Single)
- Row 8 / Column 4 → 8 (Hidden Single)
- Row 2 / Column 5 → 2 (Hidden Single)
- Row 4 / Column 3 → 9 (Hidden Single)
- Row 9 / Column 8 → 9 (Hidden Single)
- Locked Pair: 4,7 in r5c46 => r46c5,r5c28,r6c6<>7, r5c8,r6c6<>4
- Locked Candidates Type 1 (Pointing): 3 in b1 => r2c79<>3
- Locked Candidates Type 1 (Pointing): 6 in b1 => r1c46<>6
- Locked Candidates Type 1 (Pointing): 1 in b2 => r79c6<>1
- Row 9 / Column 2 → 1 (Hidden Single)
- Row 4 / Column 2 → 7 (Naked Single)
- Row 5 / Column 2 → 3 (Naked Single)
- Row 5 / Column 8 → 1 (Naked Single)
- Row 6 / Column 1 → 4 (Naked Single)
- Row 4 / Column 1 → 1 (Full House)
- Row 7 / Column 2 → 5 (Naked Single)
- Row 1 / Column 2 → 6 (Full House)
- Row 4 / Column 7 → 5 (Naked Single)
- Row 4 / Column 5 → 6 (Naked Single)
- Row 8 / Column 5 → 5 (Hidden Single)
- Row 3 / Column 5 → 7 (Naked Single)
- Row 6 / Column 5 → 9 (Naked Single)
- Row 7 / Column 5 → 1 (Full House)
- Row 6 / Column 6 → 5 (Naked Single)
- Row 6 / Column 9 → 6 (Hidden Single)
- Row 8 / Column 3 → 6 (Hidden Single)
- Row 7 / Column 3 → 4 (Hidden Single)
- Naked Triple: 5,7,8 in r1c138 => r1c4<>5, r1c6<>8, r1c7<>7
- W-Wing: 7/3 in r6c8,r7c9 connected by 3 in r3c89 => r8c8<>7
- XY-Chain: 9 9- r2c4 -5- r3c4 -6- r3c6 -8- r3c9 -3- r7c9 -7- r7c6 -9 => r12c6,r7c4<>9
- Row 7 / Column 6 → 9 (Hidden Single)
- XY-Chain: 7 7- r7c9 -3- r3c9 -8- r3c6 -6- r9c6 -7- r9c3 -3- r8c1 -7 => r8c79<>7
- Row 8 / Column 1 → 7 (Hidden Single)
- Row 9 / Column 3 → 3 (Full House)
- Row 1 / Column 1 → 5 (Naked Single)
- Row 2 / Column 1 → 3 (Full House)
- Row 7 / Column 9 → 7 (Hidden Single)
- Row 7 / Column 4 → 3 (Full House)
- Row 3 / Column 8 → 5 (Hidden Single)
- Row 3 / Column 4 → 6 (Naked Single)
- Row 3 / Column 6 → 8 (Naked Single)
- Row 3 / Column 9 → 3 (Full House)
- Row 9 / Column 4 → 7 (Naked Single)
- Row 9 / Column 6 → 6 (Full House)
- Row 2 / Column 6 → 1 (Naked Single)
- Row 5 / Column 4 → 4 (Naked Single)
- Row 5 / Column 6 → 7 (Full House)
- Row 1 / Column 6 → 4 (Full House)
- Row 2 / Column 9 → 8 (Naked Single)
- Row 1 / Column 4 → 9 (Naked Single)
- Row 2 / Column 4 → 5 (Full House)
- Row 1 / Column 8 → 7 (Naked Single)
- Row 2 / Column 3 → 7 (Naked Single)
- Row 1 / Column 3 → 8 (Full House)
- Row 1 / Column 7 → 1 (Full House)
- Row 2 / Column 7 → 9 (Full House)
- Row 4 / Column 9 → 4 (Naked Single)
- Row 4 / Column 8 → 8 (Full House)
- Row 8 / Column 9 → 1 (Full House)
- Row 6 / Column 8 → 3 (Naked Single)
- Row 6 / Column 7 → 7 (Full House)
- Row 8 / Column 7 → 3 (Full House)
- Row 8 / Column 8 → 4 (Full House)
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