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cgordon
Joined: 04 May 2007
Posts: 769
Location: ontario, canada
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 Posted: Mon Aug 11, 2008 6:09 pm Post subject: Northwest Airlines |
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Flew Northwest to Minneapolis and Seattle and found this in their inflight magazine. Northwest flyers must be awesome clever because I found four magazines with the solution filled in and no (or minimal) pencil marks. I still haven't finished it - but could be I missed a basic step.
| Code: |
+-------+-------+-------+
| 1 . . | . . . | 3 . . |
| . . 2 | . 1 . | . . . |
| . . . | . . . | . 5 . |
+-------+-------+-------+
| 2 . 1 | . . 3 | 8 . . |
| . 7 . | . . 8 | . . 4 |
| . 9 . | 7 . . | 6 . . |
+-------+-------+-------+
| 4 . 5 | . 2 . | 7 . 1 |
| . . 8 | . . . | . . 6 |
| . . . | . . 6 | . . 5 |
+-------+-------+-------+
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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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| Posted: Mon Aug 11, 2008 9:48 pm Post subject: Re: Northwest Airlines |
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| cgordon wrote: | Flew Northwest to Minneapolis and Seattle and found this in their inflight magazine. Northwest flyers must be awesome clever because I found four magazines with the solution filled in and no (or minimal) pencil marks.
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They might know on which page to find the solution :P
After basics,
| Code: |
+--------------------------+--------------------------+--------------------------+
| 1 48 679 | 245689 4678 2457 | 3 4679 2789 |
| 5 348 2 | 34689 1 47 | 49 4679 789 |
| 679 348 679 | 234689 34678 247 | 1 5 2789 |
+--------------------------+--------------------------+--------------------------+
| 2 5 1 | 46 46 3 | 8 79 79 |
| 36 7 36 | 12 9 8 | 5 12 4 |
| 8 9 4 | 7 5 12 | 6 12 3 |
+--------------------------+--------------------------+--------------------------+
| 4 6 5 | 38 2 9 | 7 38 1 |
| 379 12 8 | 1345 347 1457 | 249 349 6 |
| 379 12 379 | 1348 3478 6 | 249 3489 5 |
+--------------------------+--------------------------+--------------------------+
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only a UR (38) r79c48 with strong link (8). This allows us to remove 3 from r9c4 ("straight UR WSL")
There is a short AIC to remove 7 from r2c8:
-(7=4)r2c6-(4)r2c78=(4-6)r1c8=(6)r2c8-;r2c8<>7
That makes r14c8 a strong link in 7 and we can use that together with the 79 UR in r14c89 to remove 9 from r1c9.
And that is the end of the line for me.
| Code: |
+--------------------------+--------------------------+--------------------------+
| 1 48 679 | 245689 4678 2457 | 3 4679 278 |
| 5 348 2 | 34689 1 47 | 49 469 789 |
| 679 348 679 | 234689 34678 247 | 1 5 2789 |
+--------------------------+--------------------------+--------------------------+
| 2 5 1 | 46 46 3 | 8 79 79 |
| 36 7 36 | 12 9 8 | 5 12 4 |
| 8 9 4 | 7 5 12 | 6 12 3 |
+--------------------------+--------------------------+--------------------------+
| 4 6 5 | 38 2 9 | 7 38 1 |
| 379 12 8 | 1345 347 1457 | 249 349 6 |
| 379 12 379 | 148 3478 6 | 249 3489 5 |
+--------------------------+--------------------------+--------------------------+
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Hmmm... |
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ravel
Joined: 21 Apr 2006
Posts: 536
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| Posted: Mon Aug 11, 2008 10:17 pm Post subject: Re: Northwest Airlines |
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| nataraj wrote: | | And that is the end of the line for me. |
Not only for you. As posted, it has 145 solutions ... |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Mon Aug 11, 2008 10:56 pm Post subject: |
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I got absolutely nowhere. One would think a puzzle in an in-flight magazine would appeal to a broader readership than people who spend the time at it that most of us do.
Therefore, I will make a Craigesque statement and say that since I can't do it there must be a mistake.   |
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cgordon
Joined: 04 May 2007
Posts: 769
Location: ontario, canada
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| Posted: Mon Aug 11, 2008 11:15 pm Post subject: |
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| Quote: | | Therefore, I will make a Craigesque statement and say that since I can't do it there must be a mistake |
Nope - honest - I copied it out verbatum. Quite frankly this whole incident ruined my flight and I think I should be given a freebee. As long as the next pilot isn't the same guy who edited the Sudoku. |
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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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| Posted: Tue Aug 12, 2008 5:16 am Post subject: Re: Northwest Airlines |
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| ravel wrote: | | nataraj wrote: | | And that is the end of the line for me. |
Not only for you. As posted, it has 145 solutions ... |
Um, er ... better not use a uniqueness argument then 
And the people who filled in the solutions without PMs just found a few of those 145 ... |
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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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| Posted: Tue Aug 12, 2008 5:29 am Post subject: |
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I did it, I cracked the puzzle!
From "after basics", whenever there is a UR situation, just choose the smaller of the two candidate numbers in the topmost/leftmost "floor cell", e.g. "7" in r4c8, "1" in r5c8 etc.
Works great....
Why bother with ONE tedious solution when an airline can make their passengers happy with a puzzle that has NOTHING BUT solutions 
Craig, you spoilsport, you actually tried to find the solution? ts ts
I guess what they are trying to tell us is that we are supposed to nap on the plane, not to be too intellectual ... |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Sat Aug 23, 2008 4:52 pm Post subject: |
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In the Players' Forums, is a thread about the NWA puzzles.
http://www.sudoku.com/boards/viewtopic.php?t=6273
Starting in September, NWA's WorldTraveler magazine is suppose to stop posting Windoku puzzles with the misleading title of Sudoku, and start posting traditional, vanilla Sudoku puzzles. Now, you can have a stressless flight on NWA. |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Thu Aug 28, 2008 12:30 am Post subject: |
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| daj95376 wrote: | In the Players' Forums, is a thread about the NWA puzzles.
http://www.sudoku.com/boards/viewtopic.php?t=6273
Starting in September, NWA's WorldTraveler magazine is suppose to stop posting Windoku puzzles with the misleading title of Sudoku, and start posting traditional, vanilla Sudoku puzzles. Now, you can have a stressless flight on NWA. |
In these NWA puzzles, there are additional 3x3 shaded boxes that also contain 1-9. Extra constraints that make the solution unique.
Keith |
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