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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Sat Mar 21, 2009 5:36 pm Post subject: Set XY_01 Puzzle 7 |
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(XY-Chain seems necessary)
| Code: | +-----------------------+
| 1 . . | 8 4 . | . 7 . |
| . 8 . | . 1 6 | 2 9 . |
| . . 7 | . . . | 8 . . |
|-------+-------+-------|
| 8 . . | . . . | 9 4 . |
| 9 4 . | . . . | . 3 2 |
| . 7 . | . . . | . . . |
|-------+-------+-------|
| . 2 9 | 1 . . | . 8 . |
| 3 1 . | 4 7 . | 6 . . |
| . . . | . 2 . | . . 7 |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Sat Mar 21, 2009 11:43 pm Post subject: |
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yes, one xy-chain from the start.
the unimpressive UR 58 is there too.
it can finish with a xy-chain as well |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sun Mar 22, 2009 12:23 am Post subject: |
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This was a WINNER 
I used six steps and several pincer transports.
| Quote: | m-wing making a deletion on <5>,
xy-wing156 with extra deletions using two pincer transports with clean between,
kite3,
Type 6 UR15 with strong links on both digits,
xy-wing135 with pincer transport,
xy-wing356 with pincer transport
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Ted |
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wapati
Joined: 10 Jun 2008
Posts: 472
Location: Brampton, Ontario, Canada.
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| Posted: Sun Mar 22, 2009 3:04 am Post subject: |
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I very much liked the puzzle and the challenge.
I needed an xy-chain. I just couldn't dodge it. It was 5 or 6 cell, I think of 4s as only hinting at a cheat. Thanks Dan, great fun, once in a bit.  |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Sun Mar 22, 2009 4:09 am Post subject: |
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| storm_norm wrote: | yes, one xy-chain from the start.
the unimpressive UR 58 is there too.
it can finish with a xy-chain as well |
Norm,
What XY-Chain did you find at the start? |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Tue Mar 24, 2009 4:30 am Post subject: |
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| daj95376 wrote: | | storm_norm wrote: | yes, one xy-chain from the start.
the unimpressive UR 58 is there too.
it can finish with a xy-chain as well |
Norm,
What XY-Chain did you find at the start? |
start in r8c6
58-85-56-65
removes 5 from r9c4 |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Tue Mar 24, 2009 10:05 am Post subject: |
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| Thanks Norm. I misunderstood your original statement to imply there was a single XY-Chain from the start that cracked the puzzle. |
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wapati
Joined: 10 Jun 2008
Posts: 472
Location: Brampton, Ontario, Canada.
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| Posted: Tue Mar 24, 2009 3:01 pm Post subject: |
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| daj95376 wrote: | | Thanks Norm. I misunderstood your original statement to imply there was a single XY-Chain from the start that cracked the puzzle. |
Now I am further puzzled. I see that as an x-chain. It is also a skyscraper, sashimi-x-wing and a turbot.
I cannot make it appear to me as an an xy-chain. |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Tue Mar 24, 2009 5:41 pm Post subject: |
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| daj95376 wrote: | | Thanks Norm. I misunderstood your original statement to imply there was a single XY-Chain from the start that cracked the puzzle. |
right, it wasn't meant to be a one move step.
| Quote: | | Now I am further puzzled. I see that as an x-chain. It is also a skyscraper, sashimi-x-wing and a turbot |
Wapati,
yes, the pattern on 5's is all of those you mentioned.
it just so happens that those cells constitute a xy-chain as well.
ask yourself what happens if you start with r8c6 and say r8c6 is not 5, then r8c6 is 8 right?
if r8c6 is 8 then what happens to r5c3? and so forth around clockwise.
see where this is going? |
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