Solution for Evil Sudoku #1286713524895
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8
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This Sudoku Puzzle has 66 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Hidden Rectangle, undefined, Naked Single, Naked Pair, Discontinuous Nice Loop, Full House techniques.
Naked Single
Explanation
Hidden Single
Explanation
Locked Candidates
Explanation
Locked Candidates
Explanation
Full House
Explanation
Solution Steps:
- Row 8 / Column 8 → 8 (Hidden Single)
- Row 5 / Column 1 → 1 (Hidden Single)
- Row 7 / Column 1 → 4 (Hidden Single)
- Row 8 / Column 6 → 7 (Hidden Single)
- Row 5 / Column 8 → 7 (Hidden Single)
- Row 9 / Column 9 → 7 (Hidden Single)
- Row 1 / Column 3 → 7 (Hidden Single)
- Row 2 / Column 4 → 7 (Hidden Single)
- Row 1 / Column 9 → 4 (Hidden Single)
- Locked Candidates Type 1 (Pointing): 1 in b2 => r3c9<>1
- Locked Candidates Type 1 (Pointing): 5 in b7 => r9c5<>5
- Locked Candidates Type 1 (Pointing): 6 in b7 => r8c7<>6
- Locked Candidates Type 2 (Claiming): 3 in c1 => r8c23,r9c2<>3
- Hidden Rectangle: 1/9 in r3c46,r6c46 => r3c6<>9
- Almost Locked Set XZ-Rule: A=r8c23 {269}, B=r23456c2 {234569}, X=6, Z=2,9 => r9c2<>2, r9c2<>9
- Row 9 / Column 2 → 5 (Naked Single)
- Row 4 / Column 3 → 5 (Hidden Single)
- Locked Candidates Type 2 (Claiming): 5 in r2 => r1c8<>5
- Naked Pair: 6,9 in r4c48 => r4c26<>9
- Discontinuous Nice Loop: 9 r5c7 -9- r4c8 -6- r4c4 =6= r5c5 =3= r4c6 =4= r6c6 -4- r6c7 =4= r5c7 => r5c7<>9
- Almost Locked Set XZ-Rule: A=r2c23 {369}, B=r4568c2 {23469}, X=6, Z=9 => r3c2<>9
- Almost Locked Set XZ-Rule: A=r4c2 {34}, B=r2356c2 {23469}, X=3,4 => r8c2<>2, r13c1,r8c2<>6, r8c2<>9
- Row 8 / Column 2 → 9 (Naked Single)
- Row 8 / Column 3 → 2 (Naked Single)
- Row 8 / Column 7 → 3 (Naked Single)
- Row 9 / Column 1 → 3 (Naked Single)
- Row 8 / Column 1 → 6 (Naked Single)
- Row 5 / Column 3 → 9 (Hidden Single)
- Row 2 / Column 3 → 3 (Naked Single)
- Row 3 / Column 3 → 4 (Full House)
- Row 2 / Column 2 → 6 (Naked Single)
- Row 3 / Column 2 → 2 (Naked Single)
- Row 6 / Column 2 → 4 (Naked Single)
- Row 4 / Column 2 → 3 (Full House)
- Row 5 / Column 2 → 3 (Full House)
- Row 4 / Column 6 → 4 (Naked Single)
- Row 5 / Column 5 → 6 (Naked Single)
- Row 4 / Column 4 → 9 (Naked Single)
- Row 4 / Column 8 → 6 (Full House)
- Row 6 / Column 4 → 1 (Full House)
- Row 6 / Column 6 → 1 (Full House)
- Row 5 / Column 9 → 2 (Naked Single)
- Row 7 / Column 4 → 2 (Naked Single)
- Row 3 / Column 6 → 5 (Naked Single)
- Row 5 / Column 7 → 4 (Naked Single)
- Row 9 / Column 4 → 8 (Naked Single)
- Row 3 / Column 4 → 6 (Full House)
- Row 1 / Column 5 → 9 (Naked Single)
- Row 1 / Column 6 → 9 (Naked Single)
- Row 3 / Column 1 → 9 (Naked Single)
- Row 1 / Column 1 → 5 (Full House)
- Row 9 / Column 5 → 9 (Naked Single)
- Row 3 / Column 9 → 9 (Naked Single)
- Row 1 / Column 8 → 2 (Naked Single)
- Row 3 / Column 5 → 8 (Naked Single)
- Row 7 / Column 6 → 3 (Naked Single)
- Row 9 / Column 7 → 2 (Naked Single)
- Row 2 / Column 7 → 5 (Naked Single)
- Row 2 / Column 9 → 1 (Full House)
- Row 2 / Column 8 → 1 (Full House)
- Row 7 / Column 5 → 5 (Naked Single)
- Row 6 / Column 7 → 9 (Naked Single)
- Row 6 / Column 8 → 5 (Full House)
- Row 7 / Column 7 → 6 (Full House)
- Row 7 / Column 9 → 6 (Naked Single)
- Row 7 / Column 8 → 9 (Naked Single)
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