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Puzzle 11/06/23: ~ XY

 
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Thu Jun 23, 2011 8:24 pm    Post subject: Puzzle 11/06/23: ~ XY Reply with quote

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

Play this puzzle online at the Daily Sudoku site
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tlanglet



Joined: 17 Oct 2007
Posts: 2461
Location: Northern California Foothills

PostPosted: Fri Jun 24, 2011 11:12 pm    Post subject: Reply with quote

Danny, I looked at this puzzle but only found several seemingly useless steps, but will look at it again later. I appeared to be chasing a real BBDBer.........

Ted
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Sat Jun 25, 2011 12:04 am    Post subject: Reply with quote

tlanglet wrote:
Danny, I looked at this puzzle but only found several seemingly useless steps, but will look at it again later. I appeared to be chasing a real BBDBer.........

Ted,

I just checked my solver's solution. It used three steps plus numerous basics. More important, the steps are tightly dependent and not your garden-variety steps. I'd recommend skipping this puzzle unless you have lots of time on your hands.

Regards, Danny
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK

PostPosted: Sat Jun 25, 2011 4:10 pm    Post subject: Reply with quote

Three steps... as you say one after another
Quote:
finned x-wing(1) c8, c2 ; r5c2<>1
xyz-wing(17-2) r1c2 ; r1c3<>2
xy-chain (5=4)r5c3 ... (4=5)r8c5 ; r8c3<>5
Here's a one-stepper considering a very-well hidden UR Exclamation
Quote:
ur(47)r59c89
sis { (1)r5c89, (5)r5c9, (4)r9c6 }
but (5)r5c9 - r6c9=r6c6 and (4)r9c6 - (4=5)r6c6
implied sis { (1)r5c89, (5)r6c6 }
ur(47)[(1)r5c89=(5)r6c6] - (4)r6c6=r4c45 - (4)r4c1=hp(47)r36c1 - (9)r3c1=r2c1 - anp(39=1)r2c59 ; r4c9<>1
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Sat Jun 25, 2011 5:13 pm    Post subject: Reply with quote

peterj wrote:
Here's a one-stepper considering a very-well hidden UR Exclamation

Whew! You can say that again!!!
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