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VH 110320

 
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immpy



Joined: 06 May 2017
Posts: 570

PostPosted: Tue Nov 03, 2020 5:06 pm    Post subject: VH 110320 Reply with quote

Hello all, enjoy the puzzle...

Code:

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

Play this puzzle online at the Daily Sudoku site

cheers...immp
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storm_norm22



Joined: 24 Oct 2020
Posts: 15

PostPosted: Tue Nov 03, 2020 10:58 pm    Post subject: Reply with quote

shortest path
Quote:
is xy wing then xy wing?

(2=9)r7c1 - (9=7)r7c9 - (7=2)r4c9; r4c1 <> 1

then

(7=3)r4c7 - (3=9)r8c7 - (9=7)r7c9; r4c9 <> 7
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storm_norm22



Joined: 24 Oct 2020
Posts: 15

PostPosted: Tue Nov 03, 2020 11:09 pm    Post subject: Reply with quote

this doesn't solve it. If you are looking for a cool way to eliminate some candidates using some Unique rectangle logic then in the image below you can see that the 4's in the UR (46)r56c57 only have the escape cells of r4c57 within the columns of the UR. these 4's then are strongly inferenced and eliminate the 4's in r4c13

the same can be said of the 4's in r56c13

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TomC



Joined: 30 Oct 2020
Posts: 349
Location: Wales

PostPosted: Wed Nov 04, 2020 8:48 am    Post subject: Reply with quote

My solution W wing then W wing?

39 wing in r5c8 and r8c7 eliminates 3s in r45c7 (and r89c8)
This sets r5c8 to 3 and r4c3 to 3

Then 29 wing in r7c1 and r6c9 eliminates 9 from r7c9 = 7
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dongrave



Joined: 06 Mar 2014
Posts: 563

PostPosted: Wed Nov 04, 2020 11:59 am    Post subject: Reply with quote

Code:
+---------------+-------------+----------------+
| 8    5   9    | 6   7   1   | 2    4     3   |
| 3    2   14   | 8   9   45  | 157  17    6   |
| 7    14  6    | 3   2   45  | 159  19    8   |
+---------------+-------------+----------------+
| 124  6   1234 | 9   14  8   | 347  5     27  |
| 5    389 348  | 7   46  2   | 3469 39    1   |
| 1249 7   124  | 5   146 3   | 469  8     29  |
+---------------+-------------+----------------+
| 29   39  5    | 4   8   6   | 1379 12379 79  |
| 6    389 238  | 1   5   7   | 39   239   4   |
| 14   14  7    | 2   3   9   | 8    6     5   |
+---------------+-------------+----------------+

7*r4c9-(7=9)r7c9-(9=2)r7c1-(2=1|4)r4c15-(47*=3)r4c7-(3=9)r8c7; contradiction (i.e. 9r7c9, 9r8c7) => r4c9 <> 7; stte.
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immpy



Joined: 06 May 2017
Posts: 570

PostPosted: Wed Nov 04, 2020 5:03 pm    Post subject: Reply with quote

Nice to see all of the different approaches to solving. Thanks everyone.

cheers...immp
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