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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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 Posted: Fri Mar 28, 2008 8:04 pm Post subject: LA Times / Freep March 28, 2008 |
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Some may find this very easy ...
| Code: | Puzzle: FP032808
+-------+-------+-------+
| 7 . . | . 5 . | . . . |
| 5 . . | 7 3 9 | . . 1 |
| . . . | 1 . . | . . . |
+-------+-------+-------+
| 3 . 4 | . . . | 6 . 5 |
| . 7 . | . 6 . | . 2 . |
| 1 . 5 | . . . | 4 . 7 |
+-------+-------+-------+
| . . . | . . 3 | . . . |
| 2 . . | 9 1 5 | . . 4 |
| . . . | . 2 . | . . 8 |
+-------+-------+-------+ |
Keith |
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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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| Posted: Fri Mar 28, 2008 8:27 pm Post subject: |
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Now which of the two is easier: the x-wing or the UR?
I think we need both. One after the other. |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Fri Mar 28, 2008 8:59 pm Post subject: |
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are we talking about the UR on 46 ??
I saw the UR on 46 before I saw the x-wing |
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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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| Posted: Fri Mar 28, 2008 9:30 pm Post subject: |
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| storm_norm wrote: | are we talking about the UR on 46 ??
I saw the UR on 46 before I saw the x-wing |
So did I.
But it did not solve the puzzle. Only removed 9 in col 1 box 1 or 4.
I still needed the x-wing, and then, once again, the UR 46. This time it was a simple type 1 and solved the puzzle. |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Fri Mar 28, 2008 10:08 pm Post subject: |
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When I did it, the UR takes out <9>, which solves an <8>, which takes out a third cell in C1.
And, the puzzle is done.
If you do not use the UR, there is the X-wing, then what?
Keith
PS: When I solved the puzzle with pencil and paper, I was looking only at C1. But, Sudoku Susser points out a number of other eliminations:
R7C2 - can remove <9> from <159> leaving <15>.
R7C3 - can remove <9> from <1679> leaving <167>.
R3C1 - can remove <9> from <689> leaving <68>.
R5C1 - can remove <9> from <89> leaving <8>.
R9C2 - can remove <9> from <1359> leaving <135>.
R9C3 - can remove <9> from <1369> leaving <136>. |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Fri Mar 28, 2008 10:17 pm Post subject: |
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| so the nines are locked not only in col one but in box 7 so all the nines in box 7 are history?? |
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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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| Posted: Fri Mar 28, 2008 11:30 pm Post subject: |
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| keith wrote: | When I did it, the UR takes out <9>, which solves an <8>, which takes out a third cell in C1.
And, the puzzle is done.
If you do not use the UR, there is the X-wing, then what?
Keith
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oops I must have missed that 8 elimination.
I could not solve the puzzle without the UR. I tried to do it with only the x-wing, but no success. then (after the xwing) I used the UR and it solved the puzzle.
Only when I did it again and tried to start with the UR (and there were still 2 nines in c1 box 7) I must have gone astray somewhere.
nice puzzle! Thx, keith! |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sat Mar 29, 2008 12:09 pm Post subject: |
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| storm_norm wrote: | | so the nines are locked not only in col one but in box 7 so all the nines in box 7 are history?? |
Yes, the <9> must be in C1 and in B7.
Keith |
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