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VH+ 080421

 
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immpy



Joined: 06 May 2017
Posts: 455

PostPosted: Wed Aug 04, 2021 5:41 pm    Post subject: VH+ 080421 Reply with quote

Hello all, enjoy the puzzle...

Code:

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

Play this puzzle online at the Daily Sudoku site

cheers...immp
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Mogulmeister



Joined: 03 May 2007
Posts: 888

PostPosted: Thu Aug 05, 2021 7:05 am    Post subject: Reply with quote

Lovely puzzle Immpy!

You have here an example of an ALS xz with overlapping sets.






Last edited by Mogulmeister on Thu Aug 05, 2021 7:20 am; edited 5 times in total
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Mogulmeister



Joined: 03 May 2007
Posts: 888

PostPosted: Thu Aug 05, 2021 7:11 am    Post subject: Reply with quote

Two ALS with overlap

{3,4,7,8} Is green and also the purple square
{2,3,4,7,9} Is beige and the same purple square

The restricted common is 3

The 4 in r3c9 is eliminated because it can see all 4's in both sets.
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immpy



Joined: 06 May 2017
Posts: 455

PostPosted: Thu Aug 05, 2021 7:57 pm    Post subject: Reply with quote

Thanks Mogulmeister, and nicely solved in one step. I don't identify those things too well, so I just used X, XY, and XYZ Wings wherever applicable. And there was a 2-String Kite on (3) that helped along the way. That gave it the (+) rating.

cheers...immp
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Mogulmeister



Joined: 03 May 2007
Posts: 888

PostPosted: Thu Aug 05, 2021 9:48 pm    Post subject: Reply with quote

Thanks Immp it was certainly tricky.

I enjoy ALS because they are spatial and can be very elegant. It takes a bit of practice but I do think they are worth it.


Last edited by Mogulmeister on Thu Aug 05, 2021 9:57 pm; edited 1 time in total
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Mogulmeister



Joined: 03 May 2007
Posts: 888

PostPosted: Thu Aug 05, 2021 9:54 pm    Post subject: Reply with quote

Plenty of fails along the way.
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dongrave



Joined: 06 Mar 2014
Posts: 446

PostPosted: Sat Aug 07, 2021 9:23 pm    Post subject: Reply with quote

Starting with Mogulmeister's grid I used the following chain:
4r3c9-(4=2)r4c9-[(2=3)r4c6-(23=4*)r4c7 -(24=7)r7c9]-(4*7=2)r8c7-(2=3)r8c2-r3c2=r3c6 contradiction (i.e. 3r34c6) => r3c9 <> 4; stte.
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Mogulmeister



Joined: 03 May 2007
Posts: 888

PostPosted: Sun Aug 08, 2021 9:48 am    Post subject: Reply with quote

Nice one dongrave !
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