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agv
Joined: 29 Apr 2009
Posts: 3
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 Posted: Fri May 08, 2009 5:10 pm Post subject: Is this puzzle solvable? Free Press May 8, 2009 |
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This is the puzzle published in today's Baltimore Sun (print version).
Sun rates it a 4/4. I typed it into Draw/Play and asked for a grade, and it came up "too hard" (which I gather means unsolvable, ie, there's a mistake in it). I've checked my transcription a bunch-o-times--seems accurate--and tried solving it twice--seems pretty easy--but when I get down to the last few cells, it's a no-go. I got completely different solutions each time, so I'd assume it's me if it weren't for the D/P rating.
Anybody feel like confirming for me whether this is a playable puzzle?
| Code: |
+-------+-------+-------+
| . . 3 | . . . | 6 . 4 |
| . . . | 6 1 5 | . . 2 |
| . 9 . | . 3 . | . 7 . |
+-------+-------+-------+
| . . 1 | . . . | . . . |
| . 4 . | 3 . 7 | . . . |
| . . . | . . . | 8 . . |
+-------+-------+-------+
| . 7 . | . 4 . | . 3 . |
| 4 . . | 9 6 2 | . . . |
| 6 . . | . . . | 2 . . |
+-------+-------+-------+
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Play this puzzle online at the Daily Sudoku site |
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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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| Posted: Fri May 08, 2009 6:14 pm Post subject: |
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absolutely playable.
I needed some transported wings, though.
First step beyond basics: kite ( 8 )
Here, some "useless" wings, also 2 URs with strong links, might lead to BUG+ but I did not explore that venue
| Code: |
+--------------------------+--------------------------+--------------------------+
| 125 25 3 | 27 78 9 | 6 18 4 |
| 7 8 4 | 6 1 5 | 3 9 2 |
| 12 9 6 | 24 3 48 | 15 7 158 |
+--------------------------+--------------------------+--------------------------+
| 3 25 1 | 8 9 6 | 4 25 7 |
| 258 4 28 | 3 25 7 | 19 6 19 |
| 9 6 7 | 14 25 14 | 8 25 3 |
+--------------------------+--------------------------+--------------------------+
| 28 7 289 | 15 4 18 | 59 3 6 |
| 4 3 5 | 9 6 2 | 7 18 18 |
| 6 1 89 | 57 78 3 | 2 4 59 |
+--------------------------+--------------------------+--------------------------+
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Fri May 08, 2009 6:25 pm Post subject: |
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Basics got me here. I notice an XY-Wing with pincer transport which will eliminate the 1 from r7c1, but I didn't have time to try and take it further.
| Code: |
+---------------+-----------+-----------+
| 125 125 3 | 27 78 9 | 6 18 4 |
| 7 8 4 | 6 1 5 | 3 9 2 |
| 12 9 6 | 24 3 48 | 15 7 158 |
+---------------+-----------+-----------+
| 3 25 1 | 8 9 6 | 4 25 7 |
| 258 4 258 | 3 25 7 | 19 6 19 |
| 9 6 7 | 14 25 14 | 8 25 3 |
+---------------+-----------+-----------+
| 1258 7 2589 | 15 4 18 | 59 3 6 |
| 4 3 58 | 9 6 2 | 7 18 158 |
| 6 15 589 | 157 78 3 | 2 4 589 |
+---------------+-----------+-----------+
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Fri May 08, 2009 6:34 pm Post subject: |
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agv,
nice puzzle.
the puzzles which break down so nicely then stop without x,xy,xyz-wings is definitely a change of pace from the daily puzzles.
as said above by Marty and nataraj, this puzzle has many useless wings. after nataraj and Marty's moves its more like a hunt for your favorite xy-chain. |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Fri May 08, 2009 6:58 pm Post subject: |
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agv,
This is the same puzzle as published in the Free Press. The Friday puzzle is typically like this, and is posted and discussed regularly on this forum. To see more of these, look for the Free Press (or Freep) postings.
In Marty's grid there is a skyscraper that takes out <8> in R9C9, leading to here:
| Code: | +-------------+-------------+-------------+
| 125 25 3 | 27 78 9 | 6 18 4 |
| 7 8 4 | 6 1 5 | 3 9 2 |
| 12 9 6 | 24 3 48 | 15 7 158 |
+-------------+-------------+-------------+
| 3 25 1 | 8 9 6 | 4 25 7 |
| 258 4 28 | 3 25 7 | 19 6 19 |
| 9 6 7 | 14 25 14 | 8 25 3 |
+-------------+-------------+-------------+
| 28 7 289 | 15 4 18 | 59 3 6 |
| 4 3 5 | 9 6 2 | 7 18 18 |
| 6 1 89 | 57 78 3 | 2 4 59 |
+-------------+-------------+-------------+ |
There is a (hidden?) UR <28> in R57C13, R7C3 cannot be <8>.
This reveals an extended XY-wing 12 15 59 29 that takes out <2> in R7C1.
Keith |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Fri May 08, 2009 10:06 pm Post subject: |
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After basics, pick your favorite for [r9c9]<>8, more basics:
| Code: | +-----------------------------------------------------+
| 125 25 3 | 27 78 9 | 6 18 4 |
| 7 8 4 | 6 1 5 | 3 9 2 |
| 12 9 6 | 24 3 48 | 15 7 158 |
|-----------------+-----------------+-----------------|
| 3 25 1 | 8 9 6 | 4 25 7 |
| 258 4 28 | 3 25 7 | 19 6 19 |
| 9 6 7 | 14 25 14 | 8 25 3 |
|-----------------+-----------------+-----------------|
| 28 7 289 | 15 4 18 | 59 3 6 |
| 4 3 5 | 9 6 2 | 7 18 18 |
| 6 1 89 | 57 78 3 | 2 4 59 |
+-----------------------------------------------------+
# 36 eliminations remain
<28> UR [r57c13] => [r5c1]<>2, [r7c3]<>8
BUG+2 => [r1c1]=2 => [r8c1]<>2 and/or
=> [r3c9]=1, [r3c1]=2 => [r8c1]<>2
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