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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Sun Sep 12, 2010 4:07 am Post subject: Puzzle 10/09/12: A |
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| Code: | +-----------------------+
| . 5 . | . 7 . | . 2 . |
| 7 9 . | . . . | . . . |
| . . 8 | 4 . . | . . . |
|-------+-------+-------|
| . . 3 | . . 2 | . 6 . |
| 4 . . | . 1 . | . . . |
| . 7 . | . . 5 | . 3 1 |
|-------+-------+-------|
| . . . | 5 . . | 4 . . |
| 5 . . | 8 . . | . . 2 |
| . . . | 3 . 7 | . . 9 |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site
| Rating wrote: | difficult VH+
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JC Van Hay
Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
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| Posted: Sun Sep 12, 2010 12:06 pm Post subject: |
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| Quote: | Jellyfish (8)R69C28 : r12c7,r57c179<>8
To avoid DP (35)Band1 : => r23c9<>3
To avoid DP (68)Band1 : => r12c9<>6
XY Wing (5-68), pivot at R2C9 : => r2c7,r3c6<>6 |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Sun Sep 12, 2010 5:43 pm Post subject: |
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Similar to JC... though I never had a type 4 UR(68), only a hidden UR..
| Quote: | x-wing(8) ;
type4 UR(35) ; r23c9<>3
xyz-wing(58-6) r2c9 ; r2c7<>6
xy-wing(16-3) r2c7 ; r1c79<>3 |
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JC Van Hay
Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
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| Posted: Sun Sep 12, 2010 7:29 pm Post subject: |
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Addendum : "To avoid DP (68)Band1 : => r12c9<>6" because (6)r12c9-(65)R3C9-(53)R3C5-3B1 : => (6)r12c9-(6)r1c1.
Note : not as elegant though as Peter's solution 
JC |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Mon Sep 13, 2010 5:08 am Post subject: |
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X-Wing (8)
35 UR boxes 23; DP killers make some common eliminations
Same UR; r7c9=3 is forced
XY-Wing (163); r1c7<>3 |
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