Solution for Evil Sudoku #1423718564941
3
6
2
2
1
8
3
2
4
7
2
4
3
9
5
1
4
7
1
4
4
9
3
8
8
5
6
This Sudoku Puzzle has 71 steps and it is solved using Naked Single, Full House, Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Triple, Hidden Pair, undefined, AIC, Locked Pair, Continuous Nice Loop, Skyscraper, Sue de Coq techniques.
Naked Single
Explanation
Hidden Single
Explanation
Hidden Pair
Explanation
Locked Candidates
Explanation
Locked Candidates
Explanation
Full House
Explanation
Solution Steps:
- Row 3 / Column 5 → 7 (Naked Single)
- Row 7 / Column 5 → 6 (Naked Single)
- Row 8 / Column 5 → 1 (Naked Single)
- Row 2 / Column 5 → 4 (Full House)
- Row 4 / Column 6 → 4 (Hidden Single)
- Row 1 / Column 3 → 4 (Hidden Single)
- Row 9 / Column 9 → 4 (Hidden Single)
- Row 8 / Column 9 → 2 (Hidden Single)
- Locked Candidates Type 1 (Pointing): 7 in b1 => r79c2<>7
- Locked Candidates Type 1 (Pointing): 2 in b8 => r6c6<>2
- Locked Candidates Type 1 (Pointing): 3 in b9 => r16c8<>3
- Locked Candidates Type 2 (Claiming): 9 in c9 => r1c78,r2c7,r3c8<>9
- Naked Triple: 6,8,9 in r6c368 => r6c24<>6, r6c2<>8, r6c27<>9
- Hidden Pair: 1,3 in r5c1,r6c2 => r5c1<>5, r5c1<>8
- 2-String Kite: 9 in r6c3,r9c7 (connected by r4c7,r6c8) => r9c3<>9
- Locked Candidates Type 2 (Claiming): 9 in c3 => r4c2<>9
- XY-Wing: 5/6/9 in r2c69,r3c4 => r3c9<>9
- Row 3 / Column 9 → 8 (Naked Single)
- XY-Chain: 9 9- r2c9 -6- r5c9 -3- r5c1 -1- r6c2 -3- r7c2 -9 => r2c2<>9
- AIC: 9 9- r7c2 -3- r6c2 =3= r6c7 =2= r4c7 =9= r9c7 -9 => r7c8,r9c12<>9
- Locked Pair: 3,7 in r78c8 => r19c8,r9c7<>7
- Continuous Nice Loop: 5/6/8/9 8= r1c2 =7= r1c7 =3= r1c9 =9= r2c9 =6= r2c6 -6- r6c6 -8- r6c8 =8= r4c8 -8- r4c2 =8= r1c2 =7 => r1c27<>5, r1c9,r5c6<>6, r46c3<>8, r1c2<>9
- Skyscraper: 6 in r5c9,r6c6 (connected by r2c69) => r5c4,r6c8<>6
- X-Wing: 6 c48 r14 => r4c23<>6
- Row 9 / Column 2 → 6 (Hidden Single)
- Sue de Coq: r4c78 - {25689} (r4c23 - {589}, r5c9,r6c7 - {236}) => r5c7<>3
- Row 5 / Column 7 → 5 (Naked Single)
- XY-Chain: 1 1- r2c7 -7- r1c7 -3- r1c9 -9- r2c9 -6- r5c9 -3- r5c1 -1 => r2c1<>1
- Row 5 / Column 1 → 1 (Hidden Single)
- Row 5 / Column 4 → 7 (Naked Single)
- Row 6 / Column 2 → 3 (Naked Single)
- Row 5 / Column 6 → 8 (Naked Single)
- Row 8 / Column 4 → 5 (Naked Single)
- Row 6 / Column 7 → 2 (Naked Single)
- Row 7 / Column 2 → 9 (Naked Single)
- Row 5 / Column 3 → 6 (Naked Single)
- Row 5 / Column 9 → 3 (Full House)
- Row 6 / Column 6 → 6 (Naked Single)
- Row 3 / Column 4 → 9 (Naked Single)
- Row 4 / Column 7 → 9 (Naked Single)
- Row 6 / Column 4 → 1 (Naked Single)
- Row 4 / Column 4 → 2 (Full House)
- Row 1 / Column 4 → 6 (Full House)
- Row 2 / Column 6 → 5 (Full House)
- Row 6 / Column 3 → 9 (Naked Single)
- Row 6 / Column 8 → 8 (Full House)
- Row 4 / Column 8 → 6 (Full House)
- Row 1 / Column 9 → 9 (Naked Single)
- Row 2 / Column 9 → 6 (Full House)
- Row 4 / Column 3 → 5 (Naked Single)
- Row 4 / Column 2 → 8 (Full House)
- Row 9 / Column 7 → 1 (Naked Single)
- Row 1 / Column 8 → 5 (Naked Single)
- Row 2 / Column 1 → 9 (Naked Single)
- Row 9 / Column 3 → 7 (Naked Single)
- Row 8 / Column 3 → 8 (Full House)
- Row 1 / Column 2 → 7 (Naked Single)
- Row 2 / Column 7 → 7 (Naked Single)
- Row 1 / Column 7 → 3 (Full House)
- Row 1 / Column 1 → 8 (Full House)
- Row 3 / Column 8 → 1 (Full House)
- Row 2 / Column 2 → 1 (Full House)
- Row 3 / Column 2 → 5 (Full House)
- Row 9 / Column 8 → 9 (Naked Single)
- Row 9 / Column 6 → 2 (Naked Single)
- Row 7 / Column 6 → 7 (Full House)
- Row 9 / Column 1 → 5 (Full House)
- Row 8 / Column 1 → 3 (Naked Single)
- Row 7 / Column 1 → 2 (Full House)
- Row 7 / Column 8 → 3 (Full House)
- Row 8 / Column 8 → 7 (Full House)
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