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Feb 18 VH

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hughwill

Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK

Posted: Thu Feb 18, 2016 2:34 pm Post subject: Feb 18 VH

Code:

+--------+--------------+---------------+
| 6 9 5 | 12 7 123 | 4 23 8 |
| 2 3 7 | 8 4 5 | 9 1 6 |
| 4 8 1 | 269 236 239 | 7 5 23 |
+--------+--------------+---------------+
| 1 5 4 | 3 28 7 | 28 6 9 |
| 3 6 28 | 1245 9 124 | 1258 247 1257 |
| 9 7 28 | 1245 258 6 | 3 24 125 |
+--------+--------------+---------------+
| 7 2 6 | 49 35 49 | 15 8 135 |
| 5 1 3 | 7 26 8 | 26 9 4 |
| 8 4 9 | 256 1 23 | 256 237 2357 |
+--------+--------------+---------------+

Play this puzzle online at the Daily Sudoku site

I got to this so late I thought that someone would have shared a solution by
now! A solution:

Quote:

X-Wing on 2 r48 followed by 26-3 XY-Wing pivot r8c5

Hugh

George Woods

Joined: 28 Mar 2006
Posts: 304
Location: Dorset UK

Posted: Thu Feb 18, 2016 4:03 pm Post subject: a 1 stepper?

I considered r6c5 which if 8 sets r8c5 to 6 very quickly BUT if r6c5 is not 8 the XY wing 325 pivot r7c5 again makes r8c5 6 stte

hughwill

Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK

Posted: Thu Feb 18, 2016 6:17 pm Post subject: Re: a 1 stepper?

George Woods wrote:

I considered r6c5 which if 8 sets r8c5 to 6 very quickly BUT if r6c5 is not 8 the XY wing 325 pivot r7c5 again makes r8c5 6 stte

Neat. What would you call such a solution? Provisonal XY-wing Elimination?
Hugh

Marty R.

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

Posted: Fri Feb 19, 2016 12:57 am Post subject: Re: a 1 stepper?

hughwill wrote:

George Woods wrote:

I considered r6c5 which if 8 sets r8c5 to 6 very quickly BUT if r6c5 is not 8 the XY wing 325 pivot r7c5 again makes r8c5 6 stte

Neat. What would you call such a solution? Provisonal XY-wing Elimination?
Hugh

I would call it a Forcing Chain or something akin.

R6c5<8> 6r8c5
R8c5=8=> 6r8c5.

Quote:

Dongrave wrote in another thread

Darn x wings! There ought be a law against them.

I heartily agree.

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