7
1
8
2
6
2
3
9
4
9
3
2
4
8
6
5
2
4
9
3
1
4
8
This Sudoku Puzzle has 69 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Swordfish, Skyscraper, undefined, Uniqueness Test 2, Naked Single, Full House techniques.
Naked Single
Explanation
Hidden Single
Explanation
Locked Candidates
Explanation
Locked Candidates
Explanation
Full House
Explanation
Solution Steps:
- Row 2 / Column 1 → 4 (Hidden Single)
- Row 5 / Column 8 → 4 (Hidden Single)
- Row 7 / Column 6 → 2 (Hidden Single)
- Row 3 / Column 9 → 8 (Hidden Single)
- Row 9 / Column 9 → 2 (Hidden Single)
- Row 9 / Column 2 → 4 (Hidden Single)
- Row 2 / Column 3 → 8 (Hidden Single)
- Row 3 / Column 4 → 4 (Hidden Single)
- Row 1 / Column 9 → 4 (Hidden Single)
- Row 2 / Column 7 → 6 (Hidden Single)
- Locked Candidates Type 1 (Pointing): 7 in b3 => r3c5<>7
- Locked Candidates Type 2 (Claiming): 5 in r2 => r1c46,r3c5<>5
- Swordfish: 3 r157 c347 => r38c3,r4c4<>3
- Skyscraper: 8 in r6c1,r7c2 (connected by r67c4) => r5c2,r8c1<>8
- Row 7 / Column 2 → 8 (Hidden Single)
- Row 6 / Column 1 → 8 (Hidden Single)
- Row 8 / Column 6 → 8 (Hidden Single)
- Row 5 / Column 4 → 8 (Hidden Single)
- Row 5 / Column 7 → 3 (Hidden Single)
- Row 1 / Column 4 → 3 (Hidden Single)
- Row 4 / Column 5 → 3 (Hidden Single)
- Row 8 / Column 9 → 3 (Hidden Single)
- Row 7 / Column 3 → 3 (Hidden Single)
- Row 3 / Column 1 → 3 (Hidden Single)
- Row 9 / Column 3 → 9 (Hidden Single)
- Row 3 / Column 3 → 2 (Hidden Single)
- Row 4 / Column 1 → 2 (Hidden Single)
- Row 8 / Column 3 → 7 (Hidden Single)
- Row 6 / Column 8 → 2 (Hidden Single)
- Locked Candidates Type 2 (Claiming): 5 in c9 => r4c8,r6c7<>5
- Locked Candidates Type 2 (Claiming): 7 in c9 => r4c8,r6c7<>7
- W-Wing: 7/5 in r2c5,r9c7 connected by 5 in r8c58 => r9c5<>7
- Locked Candidates Type 1 (Pointing): 7 in b8 => r46c4<>7
- W-Wing: 1/9 in r3c5,r4c8 connected by 9 in r6c57 => r3c8<>1
- Uniqueness Test 2: 1/6 in r8c15,r9c15 => r26c5,r9c4<>5
- Row 2 / Column 5 → 7 (Naked Single)
- Row 2 / Column 6 → 5 (Full House)
- Row 6 / Column 9 → 7 (Hidden Single)
- Row 4 / Column 9 → 5 (Full House)
- Row 6 / Column 4 → 5 (Hidden Single)
- W-Wing: 6/1 in r4c4,r6c3 connected by 1 in r5c36 => r4c2,r6c5<>6
- Row 4 / Column 2 → 7 (Naked Single)
- Row 5 / Column 2 → 5 (Naked Single)
- Row 3 / Column 2 → 9 (Naked Single)
- Row 1 / Column 2 → 6 (Full House)
- Row 1 / Column 3 → 5 (Full House)
- Row 5 / Column 3 → 1 (Naked Single)
- Row 5 / Column 6 → 7 (Full House)
- Row 6 / Column 3 → 6 (Full House)
- Row 3 / Column 5 → 1 (Naked Single)
- Row 1 / Column 6 → 9 (Full House)
- Row 1 / Column 8 → 1 (Full House)
- Row 4 / Column 6 → 1 (Full House)
- Row 6 / Column 5 → 9 (Naked Single)
- Row 4 / Column 4 → 6 (Full House)
- Row 4 / Column 8 → 9 (Full House)
- Row 6 / Column 7 → 1 (Full House)
- Row 7 / Column 4 → 7 (Naked Single)
- Row 9 / Column 4 → 1 (Full House)
- Row 7 / Column 7 → 9 (Naked Single)
- Row 7 / Column 8 → 6 (Full House)
- Row 9 / Column 1 → 6 (Naked Single)
- Row 8 / Column 1 → 1 (Full House)
- Row 8 / Column 8 → 5 (Naked Single)
- Row 3 / Column 8 → 7 (Full House)
- Row 8 / Column 5 → 6 (Full House)
- Row 9 / Column 5 → 5 (Full House)
- Row 9 / Column 7 → 7 (Full House)
- Row 3 / Column 7 → 5 (Full House)
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