Next move

Post the puzzle or solving technique that's causing you trouble and someone will help

Next move

Postby BakyX » Mon Dec 08, 2014 8:16 pm

Hello again.

Am I just blind or is this puzzle harder than it looks like :) ?

Image
BakyX
 
Posts: 28
Joined: 07 May 2013

Re: Next move

Postby JasonLion » Tue Dec 09, 2014 12:21 am

Why would you say that this puzzle looks easy? The number of clues present is a very bad indicator of puzzle complexity.

This puzzle is noticeably more difficult than any you have posted so far.
User avatar
JasonLion
2017 Supporter
 
Posts: 621
Joined: 25 October 2007
Location: Silver Spring, MD, USA

Re: Next move

Postby Leren » Tue Dec 09, 2014 5:03 am

Code: Select all
*--------------------------------------------------------------*
| 6     13    7      | 8     5     2      | 9     4     13     |
| 4     2     9      | 1     7     3      | 5     8     6      |
| 13    5     8      | 6     9     4      | 2     7     13     |
|--------------------+--------------------+--------------------|
| 5-8   7     6      | 3     2    d18     | 4     15    9      |
| 9     38    1      | 5     4     68     | 7     36    2      |
| 35    4     2      | 9     16    7      | 136   1356  8      |
|--------------------+--------------------+--------------------|
| 2    b16    5      | 7     3    c16     | 8     9     4      |
| 7     168   4      | 2     168   9      | 136   136   5      |
|a18    9     3      | 4     168   5      | 16    2     7      |
*--------------------------------------------------------------*

A move that solves this puzzle is called a W Wing. The chain for this one is written (8=1) r9c9 - r7c2 = r7c6 - (1=8) r4c6 => - 8 r4c1

This chain shows that at least one of r9c9 or r4c6 must be 8. Since r4c1 sees both of these cells it can't be 8. The puzzle then solves easily.

For W Wings look for a pair of bi-value cells with the same 2 digits - the elimination digit (8 here) and the non-elimination digit (1 here).

The W Wing occurs when there is a Strong link in the non-elimination digit between 2 cells that can see the bi-value cells (ie 2 1's in Row 7 here).

Leren
Leren
 
Posts: 2852
Joined: 03 June 2012

Re: Next move

Postby BakyX » Thu Dec 18, 2014 12:36 pm

Hi Leren. This is very nice approach again, thank you :)
BakyX
 
Posts: 28
Joined: 07 May 2013


Return to Help with puzzles and solving techniques