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Another Vanhegan extreme

 
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Wed Dec 29, 2010 12:23 am    Post subject: Another Vanhegan extreme Reply with quote

I found this a little more difficult than the other one. It's puzzle 6-1518140, rated 2.2.0.2.1.

After four moves which barely made a dent, I'm stuck here:

Code:

+-------------+-------------+-------------+
| 2     68 34 | 1    7   35 | 9  568  456 |
| 68    1  5  | 4    2   9  | 68 3    7   |
| 34    9  7  | 35   6   8  | 1  2    45  |
+-------------+-------------+-------------+
| 9     56 1  | 56   8   7  | 3  4    2   |
| 34567 37 34 | 2    49  1  | 68 5689 569 |
| 456   2  8  | 3569 349 35 | 7  569  1   |
+-------------+-------------+-------------+
| 38    38 2  | 7    1   4  | 5  69   69  |
| 1     4  9  | 8    5   6  | 2  7    3   |
| 57    57 6  | 39   39  2  | 4  1    8   |
+-------------+-------------+-------------+

Play this puzzle online at the Daily Sudoku site
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daj95376



Joined: 23 Aug 2008
Posts: 3854

PostPosted: Wed Dec 29, 2010 4:43 am    Post subject: Re: Another Vanhegan extreme Reply with quote

Marty R. wrote:
After four moves which barely made a dent, ...

I'm guessing that one of your moved included r5c2<>5. Try it w/o that move.
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Wed Dec 29, 2010 5:57 am    Post subject: Reply with quote

Quote:
I'm guessing that one of your moved included r5c2<>5. Try it w/o that move.

I think you're right. One of the moves was a Hidden UR on 57 and I think I took a 5 out of r5c2 instead of r5c1.

I'll see what happens when I play with it tomorrow.

Thanks.
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK

PostPosted: Wed Dec 29, 2010 9:06 am    Post subject: Reply with quote

Yes, posting just the givens suggests that there might have been a Type 4 UR there initially?

This vaguely w-wing like chain finishes the posted grid...
Quote:
(3=5)r3c4-(5=6)r4c4 - r4c2=r1c2 - (6=8)r2c1-(8=3)r7c1 ; r3c1<>3
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Wed Dec 29, 2010 1:35 pm    Post subject: Reply with quote

After I corrected my error with the 57 Hidden, I played it as a Type 4. That allowed Multi-coloring; r6c1<>5, which set up locked 5s in box 5, finishing the puzzle.
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills

PostPosted: Thu Dec 30, 2010 2:46 pm    Post subject: Reply with quote

Another chain also does the trick..........

(3=7)r5c2-(7=5)r9c2-r4c2=r4c4-(5=3)r6c6-r1c6=r1c3; r5c3<>3=4

Ted
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