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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Sun May 01, 2011 4:31 pm Post subject: Puzzle 11/05/01: B Difficult (BBDB?) |
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| Code: | +-----------------------+
| 9 . 3 | . . . | 8 . . |
| . 8 . | . . . | . 3 5 |
| 5 . 4 | . 3 8 | 7 . 6 |
|-------+-------+-------|
| . . . | 8 5 . | . . . |
| . . 8 | 3 . 2 | . . . |
| . . 2 | . 4 6 | . 9 . |
|-------+-------+-------|
| 4 . 1 | . . . | 3 . 2 |
| . 3 . | . . 5 | . . . |
| . 9 5 | . . . | 4 . . |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Mon May 02, 2011 7:59 am Post subject: |
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There's an interesting l-wing type pattern - though instead of being based on a two-link x-chain it uses three (and grouped!)...
| Quote: | | l-wing-like(17) (7)r1c6=r4c6 - r6c4=r6c2 - r45c1=r2c1 - (1)r2c1=r2c45 ; r1c2<>7, r2c45<>7, r1c6<>1 |
A nice thing about l-wings is that you can spot them as part of an initial scan for colouring/tubot type moves - find an x-chain/colouring chain and see if a strong link on another digit gets you back to the starting house.
Alternatively you can see it as an m-wing with transport...
| Quote: | | grouped m-wing(17) transport ; (7=1)r1c6 - r2c45=(1-7)r2c1=r45c1 - r6c2=r6c4 ; r2c4<>7, r4c6<>7 |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Mon May 02, 2011 1:55 pm Post subject: |
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Sometimes you just get lucky. In this case it was the first pattern I tried.......
Type 4 UR(12)r13c28 with x-wing overlay(2) gives r1c28<>1 which appears useless.
However if we look at the internal sis we find r1c2=67, r1c8=4 ; r6c2<>7
ls(67)r17c2;
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(4)r1c8-(4=1)r1c9-(1=7)r1c6-r4c6=(7)r6c4;
Ted |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Tue May 03, 2011 4:51 am Post subject: |
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| Ho hum, typical seven moves here. |
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