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Puzzle 10/08/23: A

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Mon Aug 23, 2010 3:24 am    Post subject: Puzzle 10/08/23: A Reply with quote
Code:
 +-----------------------+
 | . 1 7 | 9 . . | 4 . . |
 | 8 3 . | 5 . . | . 1 9 |
 | 5 . 9 | 8 . . | . . 7 |
 |-------+-------+-------|
 | 7 2 3 | 4 8 . | . . 5 |
 | . . . | 1 . . | . . . |
 | . . . | . . 5 | . . 4 |
 |-------+-------+-------|
 | 2 . . | . . . | 9 . . |
 | . 7 . | . . . | . . . |
 | . 9 5 | 2 . 4 | . . 1 |
 +-----------------------+

Play this puzzle online at the Daily Sudoku site
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JC Van Hay



Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
PostPosted: Mon Aug 23, 2010 9:42 am    Post subject: Reply with quote
Quote:
Swordfish on 6 : (6)R349/c568 : => r5678c58<>6
5-SIS AIC : (96)R4C6 (61)R3C6 1B8 (14)R8C1 (49)R5C1 : (9)r4c6=(9)r5c1 : => r5c5<>9
Type 1 UR(23)R15C56 : => r5c5=7
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Mon Aug 23, 2010 3:29 pm    Post subject: Reply with quote
An ANP() did the deed.........

Quote:
ANP(78=6)r9c78-r4c8=r4c6-(6=1)r3c6-r3c5=r8c5-(1=4)r8c1-(4=236)ls:r7c9|r8c89; r9c8<>6 contradiction

Ted
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JC Van Hay



Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
PostPosted: Mon Aug 23, 2010 4:00 pm    Post subject: Reply with quote
Ted, nice use of the fish ! As with Boolean Variables, one could say "To kill or not to kill the fish, that's the question ... " Exclamation Very Happy
JC
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK
PostPosted: Mon Aug 23, 2010 8:31 pm    Post subject: Reply with quote
An xy chain...
Quote:
xy-chain with pair ; (6=7)r9c5 - (7=36)r7c49 - (6=8)r7c2 - (8=1)r7c6 - (1=6)r3c6 - (6=9)r4c6 - (9=6)r4c8 ; r9c8<>6

[Edit. Same elimination as Ted but a different chain I think]
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Tue Aug 24, 2010 12:20 am    Post subject: Reply with quote
Potential UR (23) boxes 36; pseudo cell 16789.

XY-Chain, 3-cell; r5c5<>9.
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Tue Aug 24, 2010 2:08 am    Post subject: Reply with quote
Marty R. wrote:
Potential UR (23) boxes 36; pseudo cell 16789.

XY-Chain, 3-cell; r5c5<>9.


Marty,

Great find on that type 3 UR 23 Exclamation

Also, I assume when you indicate a 3-cell xy-chain, you mean an xy-wing?????

Ted
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Tue Aug 24, 2010 3:40 am    Post subject: Reply with quote
Quote:
Also, I assume when you indicate a 3-cell xy-chain, you mean an xy-wing?????

Well, who knows, I suppose it could be anything at the rate I miss things, but I played it as an XY-Chain. Would a 3-cell XY-Chain, by definition, have to be an XY-Wing?
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Tue Aug 24, 2010 5:07 pm    Post subject: Reply with quote
Marty R. wrote:
Quote:
Also, I assume when you indicate a 3-cell xy-chain, you mean an xy-wing?????

Well, who knows, I suppose it could be anything at the rate I miss things, but I played it as an XY-Chain. Would a 3-cell XY-Chain, by definition, have to be an XY-Wing?

It's all a matter of perspective ... I learned.

If you start from a bivalue cell and treat it like a Kraken Cell with two supporting bivalue cells, then you have an XY-Wing. If you start from a tri-value cell and similarly treat it like a Kraken Cell, then you have an XYZ-Wing.

If you start from a bivalue cells and go to another bivalue cell and then proceed to a third bivaue cell, then you have a 3-cell XY-Chain.

I stopped commenting awhile back about how many extended XY-Wings could also be see as 4/5-cell XY-Chains. Similarly for some of Ted's ALS examples that used only bivalue cells.

How a person finds the elimination is often just as important as the elimination. Something this ole programmer took awhile to learn!

Last edited by daj95376 on Tue Aug 24, 2010 5:22 pm; edited 1 time in total
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Tue Aug 24, 2010 5:11 pm    Post subject: Reply with quote
I did it again and it was indeed an XY-Wing. I just saw the chain without seeing the wing.
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