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Northwest Airlines

 
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cgordon



Joined: 04 May 2007
Posts: 769
Location: ontario, canada

PostPosted: Mon Aug 11, 2008 6:09 pm    Post subject: Northwest Airlines Reply with quote

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: 1047
Location: near Vienna, Austria

PostPosted: Mon Aug 11, 2008 9:48 pm    Post subject: Re: Northwest Airlines Reply with quote

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.


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        |
+--------------------------+--------------------------+--------------------------+

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        |
+--------------------------+--------------------------+--------------------------+


Hmmm...
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ravel



Joined: 21 Apr 2006
Posts: 536

PostPosted: Mon Aug 11, 2008 10:17 pm    Post subject: Re: Northwest Airlines Reply with quote

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

PostPosted: Mon Aug 11, 2008 10:56 pm    Post subject: Reply with quote

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. Wink Laughing
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cgordon



Joined: 04 May 2007
Posts: 769
Location: ontario, canada

PostPosted: Mon Aug 11, 2008 11:15 pm    Post subject: Reply with quote

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: 1047
Location: near Vienna, Austria

PostPosted: Tue Aug 12, 2008 5:16 am    Post subject: Re: Northwest Airlines Reply with quote

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: 1047
Location: near Vienna, Austria

PostPosted: Tue Aug 12, 2008 5:29 am    Post subject: Reply with quote

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 Twisted Evil

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: 3855

PostPosted: Sat Aug 23, 2008 4:52 pm    Post subject: Reply with quote

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. Wink
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keith



Joined: 19 Sep 2005
Posts: 3333
Location: near Detroit, Michigan, USA

PostPosted: Thu Aug 28, 2008 12:30 am    Post subject: Reply with quote

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. Wink


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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