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Dec 2 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 640
Location: Dar es Salaam Tanzania

PostPosted: Thu Dec 01, 2011 10:40 pm    Post subject: Dec 2 VH Reply with quote

Finned x-wing 8 in c35; r6c4<>8 solves it.
Also the w-wing 38 with strong link 8 in col 4; r5c1<>3.
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rgmerk76



Joined: 02 Dec 2011
Posts: 1

PostPosted: Fri Dec 02, 2011 12:05 am    Post subject: Reply with quote

Fairly straightforward BUG+1 solution for me after basics - or did I stuff up?
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kuskey



Joined: 10 Dec 2008
Posts: 120
Location: Pembroke, NH

PostPosted: Fri Dec 02, 2011 5:57 am    Post subject: Dec 2 VH Reply with quote

Another 1-stepper is the 378 xy-wing with pivot at r6c4 setting r1c3<>7.
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Marty R.



Joined: 12 Feb 2006
Posts: 5065
Location: Rochester, NY, USA

PostPosted: Wed Dec 21, 2011 6:05 pm    Post subject: Reply with quote

After basics (this is for the benefit of a new member if he or she is interested).

Code:

+---------+----------+-------+
| 2  4 37 | 37 1   5 | 6 8 9 |
| 1  6 78 | 9  78  4 | 5 2 3 |
| 38 9 5  | 38 6   2 | 4 1 7 |
+---------+----------+-------+
| 7  1 9  | 2  4   6 | 8 3 5 |
| 38 2 4  | 5  38  1 | 9 7 6 |
| 6  5 38 | 78 378 9 | 1 4 2 |
+---------+----------+-------+
| 9  8 6  | 1  2   7 | 3 5 4 |
| 4  3 2  | 6  5   8 | 7 9 1 |
| 5  7 1  | 4  9   3 | 2 6 8 |
+---------+----------+-------+

Play this puzzle online at the Daily Sudoku site
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keith



Joined: 19 Sep 2005
Posts: 3136
Location: near Detroit, Michigan, USA

PostPosted: Wed Dec 21, 2011 6:47 pm    Post subject: Reply with quote

After basics:
Code:
+-------------+-------------+-------------+
| 2   4   37  | 37  1   5   | 6   8   9   |
| 1   6   78* | 9   78* 4   | 5   2   3   |
| 38  9   5   | 38  6   2   | 4   1   7   |
+-------------+-------------+-------------+
| 7   1   9   | 2   4   6   | 8   3   5   |
|-38  2   4   | 5   38# 1   | 9   7   6   |
| 6   5   38# | 78 -378 9   | 1   4   2   |
+-------------+-------------+-------------+
| 9   8   6   | 1   2   7   | 3   5   4   |
| 4   3   2   | 6   5   8   | 7   9   1   |
| 5   7   1   | 4   9   3   | 2   6   8   |
+-------------+-------------+-------------+


Analysis courtesy of Sudoku Susser:

* Squares R3C4 and R5C5 form a remote naked pair. <38> can be removed from any square that a buddy to both of them.

R2C5 - removing <8> from <78> leaving <7>.
R6C4 - removing <8> from <78> leaving <7>.

OR:

Squares R6C3 (XY), R1C3 (XZ) and R6C4 (YZ) form an XY-Wing pattern on <7>. All squares that are buddies of both the XZ and YZ squares cannot be <7>.

R1C4 - can remove <7> from <37> leaving <3>.

OR:

Squares R6C4 (XY), R1C4 (XZ) and R6C3 (YZ) form an XY-Wing pattern on <3>. All squares that are buddies of both the XZ and YZ squares cannot be <3>.

R1C3 - can remove <3> from <37> leaving <7>.

OR:

A BUG in the puzzle forces R6C5 to be <8>.

There is also a W-wing that I have marked above. No doubt there are other moves of similar difficulty.

Keith
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George Woods



Joined: 28 Mar 2006
Posts: 231
Location: Dorset UK

PostPosted: Thu Dec 22, 2011 10:12 pm    Post subject: the er solution Reply with quote

The strong link in 8 in col 4 denies an 8 at r3c1 Nowhere for an 8 in Box 4)
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Marty R.



Joined: 12 Feb 2006
Posts: 5065
Location: Rochester, NY, USA

PostPosted: Thu Dec 22, 2011 10:36 pm    Post subject: Re: the er solution Reply with quote

George Woods wrote:
The strong link in 8 in col 4 denies an 8 at r3c1 Nowhere for an 8 in Box 4)

George, I'm sorry, I just don't understand your statements. I do see where that 8 is removed by the Skyscraper in r25.
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