1
8
1
3
7
1
3
4
1
2
3
4
9
7
8
1
2
3
4
5
9
6
2
4
8
4
5
7
9
This Sudoku Puzzle has 61 steps and it is solved using Naked Single, Full House, Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Triple, undefined, Hidden Rectangle, Bivalue Universal Grave + 1 techniques.
Naked Single
Explanation
Hidden Single
Explanation
Locked Candidates
Explanation
Locked Candidates
Explanation
Full House
Explanation
Solution Steps:
- Row 5 / Column 7 → 6 (Naked Single)
- Row 5 / Column 3 → 9 (Full House)
- Row 8 / Column 5 → 3 (Naked Single)
- Row 9 / Column 5 → 6 (Naked Single)
- Row 1 / Column 5 → 4 (Naked Single)
- Row 2 / Column 5 → 7 (Full House)
- Row 1 / Column 3 → 3 (Hidden Single)
- Row 7 / Column 3 → 7 (Naked Single)
- Row 9 / Column 3 → 5 (Naked Single)
- Row 9 / Column 1 → 3 (Naked Single)
- Row 7 / Column 1 → 9 (Naked Single)
- Row 7 / Column 2 → 1 (Full House)
- Row 6 / Column 4 → 3 (Hidden Single)
- Row 4 / Column 6 → 4 (Hidden Single)
- Row 3 / Column 2 → 4 (Hidden Single)
- Row 9 / Column 7 → 4 (Hidden Single)
- Row 3 / Column 8 → 9 (Hidden Single)
- Row 7 / Column 7 → 3 (Hidden Single)
- Row 3 / Column 1 → 7 (Hidden Single)
- Row 8 / Column 8 → 5 (Hidden Single)
- Row 7 / Column 8 → 6 (Hidden Single)
- Locked Candidates Type 1 (Pointing): 8 in b3 => r3c3<>8
- Locked Candidates Type 2 (Claiming): 8 in c8 => r4c7,r6c9<>8
- Naked Triple: 2,6,8 in r137c9 => r8c9<>8
- 2-String Kite: 5 in r2c1,r6c6 (connected by r4c1,r6c2) => r2c6<>5
- XY-Wing: 5/8/6 in r4c14,r6c3 => r4c2,r6c6<>6
- Row 6 / Column 6 → 5 (Naked Single)
- Row 4 / Column 4 → 6 (Full House)
- XY-Wing: 2/7/5 in r14c7,r4c2 => r1c2<>5
- Row 1 / Column 7 → 5 (Hidden Single)
- Row 3 / Column 4 → 5 (Hidden Single)
- X-Wing: 2 r17 c69 => r2c6,r3c9<>2
- Hidden Rectangle: 6/9 in r1c26,r2c26 => r1c2<>6
- Row 1 / Column 2 → 9 (Naked Single)
- Bivalue Universal Grave + 1 => r2c3<>2, r2c3<>8
- Row 2 / Column 3 → 6 (Naked Single)
- Row 2 / Column 2 → 5 (Naked Single)
- Row 2 / Column 6 → 9 (Naked Single)
- Row 3 / Column 3 → 2 (Naked Single)
- Row 6 / Column 3 → 8 (Full House)
- Row 2 / Column 1 → 8 (Full House)
- Row 2 / Column 4 → 2 (Full House)
- Row 4 / Column 1 → 5 (Full House)
- Row 1 / Column 6 → 6 (Full House)
- Row 1 / Column 9 → 2 (Full House)
- Row 4 / Column 2 → 7 (Naked Single)
- Row 6 / Column 2 → 6 (Full House)
- Row 8 / Column 6 → 8 (Naked Single)
- Row 7 / Column 6 → 2 (Full House)
- Row 7 / Column 9 → 8 (Full House)
- Row 3 / Column 7 → 8 (Naked Single)
- Row 3 / Column 9 → 6 (Full House)
- Row 6 / Column 8 → 1 (Naked Single)
- Row 6 / Column 9 → 7 (Full House)
- Row 8 / Column 9 → 1 (Full House)
- Row 9 / Column 4 → 1 (Naked Single)
- Row 9 / Column 8 → 2 (Full House)
- Row 8 / Column 7 → 7 (Full House)
- Row 4 / Column 7 → 2 (Full House)
- Row 8 / Column 4 → 9 (Full House)
- Row 4 / Column 8 → 8 (Full House)
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