9
8
3
7
5
1
3
4
6
7
1
2
1
8
9
6
3
2
7
5
1
8
7
9
This Sudoku Puzzle has 78 steps and it is solved using Naked Single, Hidden Single, undefined, Discontinuous Nice Loop, Locked Candidates Type 2 (Claiming), Empty Rectangle, AIC, Locked Candidates Type 1 (Pointing), Naked Pair, Full House techniques.
Naked Single
Explanation
Hidden Single
Explanation
Locked Candidates
Explanation
Locked Candidates
Explanation
Full House
Explanation
Solution Steps:
- Row 5 / Column 1 → 5 (Naked Single)
- Row 6 / Column 2 → 8 (Naked Single)
- Row 3 / Column 3 → 3 (Hidden Single)
- Row 7 / Column 1 → 8 (Hidden Single)
- Row 7 / Column 6 → 2 (Hidden Single)
- Row 7 / Column 8 → 1 (Hidden Single)
- Row 4 / Column 9 → 5 (Hidden Single)
- Row 6 / Column 6 → 5 (Hidden Single)
- Row 9 / Column 3 → 5 (Hidden Single)
- Row 8 / Column 7 → 5 (Hidden Single)
- Row 8 / Column 9 → 8 (Hidden Single)
- X-Wing: 3 r68 c48 => r2c8,r5c4<>3
- Row 2 / Column 7 → 3 (Hidden Single)
- 2-String Kite: 9 in r4c2,r7c5 (connected by r7c3,r8c2) => r4c5<>9
- Finned X-Wing: 2 r34 c28 fr3c7 fr3c9 => r2c8<>2
- Discontinuous Nice Loop: 2 r1c2 -2- r4c2 =2= r4c8 =7= r2c8 -7- r2c2 =7= r1c2 => r1c2<>2
- Discontinuous Nice Loop: 4 r2c2 -4- r8c2 -9- r4c2 -2- r4c8 -7- r2c8 =7= r2c2 => r2c2<>4
- Finned X-Wing: 4 r26 c48 fr2c5 fr2c6 => r1c4<>4
- Discontinuous Nice Loop: 6 r2c4 -6- r4c4 -9- r4c2 -2- r2c2 =2= r2c4 => r2c4<>6
- Discontinuous Nice Loop: 4 r2c8 -4- r6c8 -3- r6c4 =3= r5c5 =7= r4c5 -7- r4c8 =7= r2c8 => r2c8<>4
- Locked Candidates Type 2 (Claiming): 4 in r2 => r13c5,r3c6<>4
- XY-Chain: 6 6- r1c3 -2- r5c3 -9- r4c2 -2- r4c8 -7- r2c8 -6 => r1c7<>6
- XY-Chain: 4 4- r2c6 -6- r2c8 -7- r4c8 -2- r4c2 -9- r8c2 -4 => r8c6<>4
- W-Wing: 6/9 in r4c4,r8c6 connected by 9 in r48c2 => r4c6,r8c4<>6
- Empty Rectangle: 6 in b3 (r8c68) => r3c6<>6
- AIC: 4 4- r2c6 -6- r8c6 =6= r8c8 =3= r8c4 -3- r6c4 -4 => r2c4,r5c6<>4
- Row 2 / Column 4 → 2 (Naked Single)
- Row 2 / Column 6 → 4 (Hidden Single)
- Row 8 / Column 6 → 6 (Hidden Single)
- Locked Candidates Type 1 (Pointing): 6 in b9 => r3c7<>6
- Naked Pair: 3,4 in r68c8 => r3c8<>4
- X-Wing: 2 c28 r34 => r3c79<>2
- 2-String Kite: 9 in r5c3,r8c4 (connected by r7c3,r8c2) => r5c4<>9
- XY-Chain: 4 4- r5c4 -1- r5c6 -9- r5c3 -2- r4c2 -9- r8c2 -4- r8c8 -3- r6c8 -4 => r5c79,r6c4<>4
- Row 6 / Column 4 → 3 (Naked Single)
- Row 6 / Column 8 → 4 (Full House)
- Row 8 / Column 8 → 3 (Naked Single)
- Row 5 / Column 9 → 3 (Hidden Single)
- Row 9 / Column 5 → 3 (Hidden Single)
- XY-Wing: 1/4/9 in r5c46,r8c4 => r4c4<>9
- Row 4 / Column 4 → 6 (Naked Single)
- XY-Chain: 1 1- r1c4 -9- r8c4 -4- r8c2 -9- r4c2 -2- r5c3 -9- r5c6 -1 => r3c6,r5c4<>1
- Row 5 / Column 4 → 4 (Naked Single)
- Row 8 / Column 4 → 9 (Naked Single)
- Row 1 / Column 4 → 1 (Full House)
- Row 7 / Column 5 → 4 (Full House)
- Row 8 / Column 2 → 4 (Full House)
- Row 7 / Column 9 → 7 (Naked Single)
- Row 1 / Column 2 → 7 (Naked Single)
- Row 9 / Column 2 → 1 (Naked Single)
- Row 7 / Column 7 → 6 (Naked Single)
- Row 7 / Column 3 → 9 (Full House)
- Row 9 / Column 1 → 6 (Full House)
- Row 2 / Column 2 → 5 (Naked Single)
- Row 5 / Column 3 → 2 (Naked Single)
- Row 1 / Column 3 → 6 (Full House)
- Row 4 / Column 2 → 9 (Full House)
- Row 3 / Column 2 → 2 (Full House)
- Row 1 / Column 1 → 4 (Naked Single)
- Row 3 / Column 1 → 1 (Full House)
- Row 2 / Column 5 → 6 (Naked Single)
- Row 2 / Column 8 → 7 (Full House)
- Row 5 / Column 7 → 7 (Naked Single)
- Row 4 / Column 8 → 2 (Full House)
- Row 3 / Column 8 → 6 (Full House)
- Row 4 / Column 6 → 8 (Naked Single)
- Row 4 / Column 5 → 7 (Full House)
- Row 5 / Column 5 → 9 (Naked Single)
- Row 5 / Column 6 → 1 (Full House)
- Row 3 / Column 6 → 9 (Full House)
- Row 1 / Column 5 → 8 (Naked Single)
- Row 3 / Column 5 → 5 (Full House)
- Row 3 / Column 9 → 4 (Naked Single)
- Row 3 / Column 7 → 8 (Full House)
- Row 1 / Column 7 → 2 (Naked Single)
- Row 1 / Column 9 → 9 (Full House)
- Row 9 / Column 9 → 2 (Full House)
- Row 9 / Column 7 → 4 (Full House)
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