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Puzzle 10/10/17: A XY -- Ted Special!

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Sun Oct 17, 2010 12:28 am    Post subject: Puzzle 10/10/17: A XY -- Ted Special! Reply with quote
I was reviewing a new batch of puzzles when I ran across this one. After a few steps, this puzzle needs an XY-Chain ... or one of Ted's special UR eliminations. Everyone welcome to participate.

Code:
 +-----------------------+
 | 9 . . | . 5 . | . . . |
 | . 8 . | . . 2 | . . . |
 | . . 2 | . 1 9 | . 4 . |
 |-------+-------+-------|
 | . . . | 3 7 . | 9 2 4 |
 | 2 . 9 | 4 8 5 | 1 . . |
 | . 4 7 | . 2 . | . 8 6 |
 |-------+-------+-------|
 | . . . | 1 9 . | . . 5 |
 | . . 3 | 5 . 8 | . 9 . |
 | . . . | 2 . 7 | 4 . 8 |
 +-----------------------+

Play this puzzle online at the Daily Sudoku site
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sun Oct 17, 2010 4:27 am    Post subject: Reply with quote
Quote:
Coloring (3), r7c7<>3
XY-Wing (346)
Hidden UR (27), eliminating one of each digit
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK
PostPosted: Sun Oct 17, 2010 8:29 am    Post subject: Reply with quote
Not sure this is what was in mind - but along the same lines..
Quote:
turbot/ER(3) ; r7c8<>3
xy-chain with UR ; (3=5)r3c2 - (5=1)r4c2 - UR(27)r78c27:[(1)r8c2=(6)r78c7] - (6=3)r2c7 ; r3c7<>3
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Sun Oct 17, 2010 10:34 pm    Post subject: Reply with quote
Thanks for the special puzzle Danny.

Since I am always interested in a glass of wine, I started with a flightless skyscraper (which goes down to the car park and up to a wine bar) at (3)r59c8 plus transport: (3)r9c5-r2c5=r1c6-r1c2=(3)r3c2; r3c9<>3

xy-wing 34-6 vertex (34)r7c6

AUR(27)r78c27 external SIS: r8c9=2,r78c1=7
AUR(27)r78c27[(2)r8c9=(7)r7c1]-(7=2)r7c2; r7c7,r8c2<>2
AUR(27)r78c27[(7)r7c1=(2)r8c9]-(2=7)r8c7; r7c8,r8c2<>7

Fini,
Ted
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