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immpy
Joined: 06 May 2017 Posts: 571
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Posted: Wed Aug 04, 2021 5:41 pm Post subject: VH+ 080421 |
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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 |
+-------+-------+-------+
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Play this puzzle online at the Daily Sudoku site
cheers...immp |
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Mogulmeister
Joined: 03 May 2007 Posts: 1151
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Posted: Thu Aug 05, 2021 7:05 am Post subject: |
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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: 1151
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Posted: Thu Aug 05, 2021 7:11 am Post subject: |
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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: 571
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Posted: Thu Aug 05, 2021 7:57 pm Post subject: |
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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: 1151
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Posted: Thu Aug 05, 2021 9:48 pm Post subject: |
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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: 1151
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Posted: Thu Aug 05, 2021 9:54 pm Post subject: |
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Plenty of fails along the way. |
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dongrave
Joined: 06 Mar 2014 Posts: 568
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Posted: Sat Aug 07, 2021 9:23 pm Post subject: |
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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: 1151
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Posted: Sun Aug 08, 2021 9:48 am Post subject: |
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Nice one dongrave ! |
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