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VH 091321

 
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immpy



Joined: 06 May 2017
Posts: 450

PostPosted: Mon Sep 13, 2021 4:14 pm    Post subject: VH 091321 Reply with quote

Hello all, enjoy the puzzle...

Code:

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

Play this puzzle online at the Daily Sudoku site

cheers...immp
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Clement



Joined: 24 Apr 2006
Posts: 1055
Location: Dar es Salaam Tanzania

PostPosted: Wed Sep 15, 2021 9:35 am    Post subject: VH 091321 Reply with quote

There may be a better solution
Code:

+---------------------+---------------------+-----------------------+
| 258     578     4   | 267      3       1  |g2568      9      2568 |
| 6       1      i258 | 29       4       59 | 3         7     h258  |
| 3       57      9   | 267      257     8  | 256       4      1    |
+---------------------+---------------------+-----------------------+
| 4       2       1   | 39       8       6  | 7        d35    d59   |
| 578     39     j58  | 1        57      4  | 269      d23     269  |
| 57      39      6   | 2379     257     59 | 1         8      4    |
+---------------------+---------------------+-----------------------+
| 9       6      k25  | 8        1       3  | 4        c25     7    |
| 1     la5-8     7   | 4        9       2  |b58*       6      3    |
| 28      4       3   | 5        6       7  |f28*9      1     e289  |
+---------------------+---------------------+-----------------------+

8r8c2 (8*=5)r8c7 (5=2)r7c8 (2=359)b6p523 (9)r9c9 = (9-8*)r9c7 = (8)r1c7 r2c9 = r2c3 (8=5)r5c3 r7c3 = (5)r8c2 => - 8r8c2; stte
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Mogulmeister



Joined: 03 May 2007
Posts: 854

PostPosted: Wed Sep 15, 2021 12:42 pm    Post subject: Reply with quote

(Removed) posted twice

Last edited by Mogulmeister on Wed Sep 15, 2021 2:31 pm; edited 1 time in total
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Mogulmeister



Joined: 03 May 2007
Posts: 854

PostPosted: Wed Sep 15, 2021 12:46 pm    Post subject: Reply with quote

Very nice Clement.



There's an almost <259> XY wing shown in purple. However this is foiled by the 8 in r9c9.

So either the XY wing is true or the 8 is true.

Now if you argue that 8 is true in r9c9 then follow the green squares to see what happens. There's a contradiction that shows the 8 can't exist in r9c9.

XY Wing is true and red square r4c8 <> 5. Solved.


Last edited by Mogulmeister on Wed Sep 15, 2021 12:52 pm; edited 1 time in total
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TomC



Joined: 30 Oct 2020
Posts: 101
Location: Wales

PostPosted: Wed Sep 15, 2021 12:51 pm    Post subject: Reply with quote

Code:

+--------------+-------------+--------------+
| 2578 578 4   | 267  3   1  | 2568 9  2568 |
| 6    1   258 | 29   4   59 | 3    7  258  |
| 3    57  9   | 267  257 8  | 256  4  1    |
+--------------+-------------+--------------+
| 4    2   1   | 39   8   6  | 7    35 59   |
| 578  39  58  | 1    57  4  | 269  23 269  |
| 57   39  6   | 2379 257 59 | 1    8  4    |
+--------------+-------------+--------------+
| 9    6   25  | 8    1   3  | 4    25 7    |
| 1    58  7   | 4    9   2  | 58   6  3    |
| 28   4   3   | 5    6   7  | 289  1  289  |
+--------------+-------------+--------------+

Play this puzzle online at the Daily Sudoku site

I used a 258 XY wing -8 r5c1 then a couple of basics leads to 259 XY -5 r4c8
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