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VH+ 042121

 
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immpy



Joined: 06 May 2017
Posts: 571
PostPosted: Wed Apr 21, 2021 6:03 pm    Post subject: VH+ 042121 Reply with quote
Hello all, enjoy the puzzle...

Code:

+-------+-------+-------+
| 8 . . | 6 . 7 | . . 1 |
| 1 9 . | . . . | . . 5 |
| . 3 2 | . 9 . | 7 4 . |
+-------+-------+-------+
| . 2 . | 8 . 1 | . 5 . |
| . 4 . | . 7 . | . 8 . |
| . 6 . | 4 . 9 | . 7 . |
+-------+-------+-------+
| . 7 5 | . 1 . | 8 6 . |
| 4 . . | . . . | . . 7 |
| 9 . . | 7 . 2 | . . 4 |
+-------+-------+-------+

Play this puzzle online at the Daily Sudoku site

cheers...immp
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TomC



Joined: 30 Oct 2020
Posts: 358
Location: Wales
PostPosted: Thu Apr 22, 2021 11:52 am    Post subject: Reply with quote
Code:

+----------+------------+--------------+
| 8  5  4  | 6  23   7  | 239 239 1    |
| 1  9  7  | 23 4    8  | 6   23  5    |
| 6  3  2  | 1  9    5  | 7   4   8    |
+----------+------------+--------------+
| 7  2  9  | 8  36   1  | 4   5   36   |
| 35 4  1  | 25 7    36 | 39  8   2369 |
| 35 6  8  | 4  25   9  | 1   7   23   |
+----------+------------+--------------+
| 2  7  5  | 39 1    4  | 8   6   39   |
| 4  18 36 | 59 58   36 | 259 129 7    |
| 9  18 36 | 7  3568 2  | 35  13  4    |
+----------+------------+--------------+

Play this puzzle online at the Daily Sudoku site

Using the 23 pair in r1c5 and r6c9 means r6c5 <> 2 as then no 3's in r4

Tom
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dongrave



Joined: 06 Mar 2014
Posts: 568
PostPosted: Thu Apr 22, 2021 4:23 pm    Post subject: Reply with quote
Starting with TomC's grid, I used the following chain:

(2=5)r5c4 - (5=3)r5c1 - r5c6 = r4c5 - (3=2)r1c5 => r2c4 <> 2; stte.
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Fri Apr 30, 2021 7:43 pm    Post subject: Reply with quote
Well,

You know how I'll solve it. After basics:

Code:
+----------------+----------------+----------------+
| 8    5    4    | 6    23   7    | 239  239  1    |
| 1    9    7    | 23   4    8    | 6    23   5    |
| 6    3    2    | 1    9    5    | 7    4    8    |
+----------------+----------------+----------------+
| 7    2    9    | 8    36y  1    | 4    5    36x  |
| 35   4    1    | 25   7    36x  | 39   8    2-369|
| 35   6    8    | 4    25   9    | 1    7    2-3  |
+----------------+----------------+----------------+
| 2    7    5    | 39x  1    4    | 8    6    39y  |
| 4    18   36   | 59   58   36y  | 259  129  7    |
| 9    18   36   | 7   -3568 2    | 35   13   4    |
+----------------+----------------+----------------+

The only "interesting" digit is 3. (It has a pattern of unknowns that may result in single-digit eliminations via strong links.)

There are strong links on 3 in R4, R7, and C6, and we can label their ends x, y, x, ... around the cycle. Any cell that sees both an x and a y is not 3.

Actually, you only need to take out 3 in R6C9 to solve it.

This is officially called a Swordfish-thingy, perhaps a Mutant or a Franken-Swordfish. Wink

Keith
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