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Puzzle 10/10/23: C XY

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Sat Oct 23, 2010 5:34 am    Post subject: Puzzle 10/10/23: C XY Reply with quote
Probably very difficult.

Code:
 +-----------------------+
 | 1 8 . | 5 4 7 | . . . |
 | 2 3 . | . 8 . | 4 . 7 |
 | . . 4 | . . . | 8 . . |
 |-------+-------+-------|
 | 8 . . | 9 . 1 | 2 . 5 |
 | 5 2 . | . 7 . | . . 8 |
 | 9 . . | 8 . 2 | . . . |
 |-------+-------+-------|
 | . 9 2 | 7 . . | . . 4 |
 | . . . | . . . | . . . |
 | . 1 . | 4 3 . | 5 . 9 |
 +-----------------------+

Play this puzzle online at the Daily Sudoku site
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK
PostPosted: Sat Oct 23, 2010 7:55 am    Post subject: Reply with quote
One of my m-wing style chains does the trick...
Quote:
m-wing-style(59) with xy-chain head ; (9=2)r8c5-(2=6)r8c4-(6=5)r8c2 - r8c3=(5-9)r2c3=r1c3
flightless with transport (9)r8c5 - r3c5=r2c6 ; r2c3<>9
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Sat Oct 23, 2010 1:42 pm    Post subject: Reply with quote
Another one step chain......

Quote:
(6=9)r1c3-r3c1=r9c1-(6=8)r9c6-(8=269)ls:r8c456-(6=5)r8c2-r3c2=(5)r2c3; r2c3<>9

Ted
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Sat Oct 23, 2010 1:44 pm    Post subject: Reply with quote
peterj wrote:
One of my m-wing style chains does the trick...


Peter,

You have become very proficient with those m-wing based chains. Good show!

Ted
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sun Oct 24, 2010 5:59 pm    Post subject: Reply with quote
X-Wing (6)
XY-Wing (169)
XY-Wing (126), flightless with transport; r8c2<>6
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