Help with only one move.

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Help with only one move.

Hello guys.

I'm new to the forum and I'm fascinated at solving Sudokus, but I'm stuck now and I appreciate if you can help me just showing me one movement and telling me why!

Here we go:

5.9463.7.
6...8.453
.34752...
7453.6.2.
961248735
....756.4
.965.7.4.
4..6....7
...824...

Thank you.
asdfgh

Posts: 6
Joined: 21 January 2016

Re: Help with only one move.

Welcome to the forum!

Code: Select all
`5.9463.7.6...8.453.34752...7453.6.2.961248735....756.4.965.7.4.4..6....7...824...5      128    9      | 4      6      3      | 128    7      128   6      127    27     | 19     8      19     | 4      5      3     18     3      4      | 7      5      2      | 189    1689   1689  ---------------------+----------------------+---------------------7      4      5      | 3      19     6      | 189    2      189   9      6      1      | 2      4      8      | 7      3      5     238    28     238    | 19     7      5      | 6      189    4     ---------------------+----------------------+---------------------1238   9      6      | 5      13     7      | 1238   4      128   4      1258   238    | 6      139    19     | 123589 189    7     13     157    37     | 8      2      4      | 1359   169    169   `

There is a finned swordfish in rows 3, 4, and 7 on the digit 8. It should be singles from there to the end.

You can read more about Finned Swordfish at Sudopedia, or any of several other websites.

JasonLion
2017 Supporter

Posts: 640
Joined: 25 October 2007
Location: Silver Spring, MD, USA

Re: Help with only one move.

Code: Select all
`*-----------------------------------------------------------------------*| 5      18     9       | 4      6      3       | 128    7      128     || 6      27     27      | 19     8      19      | 4      5      3       || 1-8    3      4       | 7      5      2       | 189   a1689   1689    ||-----------------------+-----------------------+-----------------------|| 7      4      5       | 3      19     6       | 189    2      189     || 9      6      1       | 2      4      8       | 7      3      5       || 238    28     238     | 19     7      5       | 6      19     4       ||-----------------------+-----------------------+-----------------------||d1238   9      6       | 5      13     7       |c1238   4     c128     || 4      1258   238     | 6      139    19      | 12358 b18     7       || 13     157    37      | 8      2      4       | 1359   169    169     |*-----------------------------------------------------------------------*`

There is a two stringed kite in the cells I've marked abcd.

If r3c8 (Cell a) is not 8 then r8c8 (Cell b) must be 8 (only 2 8's in Column 8). So both r7c79 (Cells c) can't be 8, so r7c1 (Cell d) must be 8 (Only 3 8's in Row 7).

You can reverse the argument and assume that Cell d is not 8 and conclude that Cell a must be 8. So at least one of Cells a and d must be 8. They might both be 8 but they can't both be not 8.

Since r3c1 sees both of Cells a and d it can't be 8, so it is 1. The puzzle solves easily after that.

Here is a link to a site that discusses two stringed kites (and a lot else as well) http://hodoku.sourceforge.net/en/tech_sdp.php#t2sk

Leren
Leren

Posts: 3319
Joined: 03 June 2012

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