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For those of us in self-isolation or quarantine with too much time on their hands, I have expanded the Str8ts puzzles to a new 'every two-days' series. Check out the new player. Stay well.
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Since there has been interesting strategy discussion on these puzzles and by popular request, I have opened an archive on the last thirty weeks. The discussion section is open for continued posting.
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Latest threads are now at the top.
In addition, posts you have NOT read are in normal colors, older ones are in grey.
Please email me if you experience problems or bugs. Cheers, Andrew Stuart


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by:morl

 
It's raining...

is.gd/morl_518_2

 

by: jgrab

 
 
Opens nicely with a Setti interaction.

 

by: BP

 
 
Thanks, morl, for this beauty. I love setti considerations.

 

by: Toni

 
 
Really nice chainless puzzle! With A5 being the cherry on the cake or umbrella :)

 

by: kolumbus

Add to this thread
 
I did it with 3 fishes, CE, 1 normal Setti, no special considerations. Thanks, morl

by:Leren

 


is.gd/Leren_518_X2

 

by: kolumbus

 
 
Again a skewed fishes festival, staight ahead, thanx!

 

by: BP

Add to this thread
 
Very delicious skewed fish soup. Thanks Leren!

by:Leren

 

These next 2 puzzles should be more relaxing. No chains, SI's, UR's or fancy Setti arguments. Just standard moves.

is.gd/Leren_518_2

 

by: jgrab

 
 
Thanks. A nice Setti cascade.

 

by: BP

Add to this thread
 
Nice and quick. A little setti analysis did it. Thanks!

by:pax

 
I would like to draw your attention to the new 'every 2 days' of Andrew. Difficult, but solvable (for me with HC).

 

by: pets

 
 
@pax:I found an interesting two cell UR: J9=89 would lead to a non-unique solution with H9 --> J9=7.
After setti 8, the remaining 17 cells needed a HC as well. Mine started with D6=1, which conflicts after 5 cells in G5. Did you find a shorter HC?

 

by: pets

 
 
Apologize: My last comment was regarding Andrew's weekly. Haven't even looked at the 'every two days'

 

by: Fab

 
 
On the 'every two days', I also found it difficult and chained. A lot. The first big chain was a careful game of high/low in rows A,D,E and columns 1,4,9. Settis also help and there is an optional UR.

 

by: Jens

Add to this thread
 
I had to guess in two positions: A1 and G6.
Pls. open forum.str8ts.de and look at my solution.

by:morl

 
BUG variation of my puzzle from last week.

is.gd/morl518_1

 

by: jgrab

 
 
Easier than last week. I overlooked/forgot what BUG stands for?

 

by: Fab

Add to this thread
 
Thanks. To reach the BUG I needed setti and a SI in the middle.
Here is a reference for the BUG strategy : www -dot- sudokuwiki -dot- org/BUG
it stands for "Bivalue Universal Graveyard" and works on the unicity principle. As far as I understand, to apply it in str8ts you need to know all required/excluded digits in all compartments.

by:Leren

 


is.gd/Leren_518_X

 

by: puzzled

 
 
Like many of your puzzles, but unlike Andrew's, I don't get very far.

What is the key to these puzzles with so few clues? Besides simple logic, settis, fishes and URs.

 

by: Leren

 
 
In case you don't know, this is an X puzzle. The diagonals have compartments just like in rows and columns. In addition, many moves peculiar to X puzzles have been discovered. There is a big list of them in week 500.

 

by: pax

 
 
Another master piece, I needed x-wings, settis, and 2 short head chains. But probably more elegant ways possible :).

 

by: jgrab

 
 
Quite hard, took me 90 min. The skewed wings were not enough.

 

by: kolumbus

 
 
A hard nut – besides common tools I used lots of skewed wings, a short head chain to solve J1 and some Setti considerations (1/2/5/9) which finally solve. Thank you Leren!

 

by: milkyjoe

 
 
Same here, quite hard. Used skewed x-wings, some setti considerations with implications on r5 & cF, then some more skewed x-wings. At 21 solved cells I used another setti consideration on 9 in combination with setti 5 to solve, but I'm not quite convinced that my setti considerations were chainfree (some might at least call them street interactiony... ;).

 

by: BP

 
 
Hard indeed. With skewed wings and fishes to 21 solved cells. Then after milkyjoe's hint an SI-setti-analysis of setti 9 which solved. Thanks, milkyjoe for the hint, and thanks, Leren, for this tough beast!

 

by: Fab

Add to this thread
 
Phew, tough indeed.
First time I used setti considerations to fix the high/low in col.5, then got stuck until I read milkyjoe's comment with BP's precision. But I got a mistake afterwards. Second time, to fix that high/low I used a small headchain on the two possible positions of 6 in row A.
There are several skewed X-wings, a skewed swordfish on the left, and a skewed almost jellyfish on the right. That almost jellyfish still allows several eliminations in cols 6,7,9 because those positions would exclude the endofin (by Leren's vocabulary). Unfortunately those exclusions did not make the puzzle progress.
Thanks Leren, milkyjoe & BP.

by:Leren

 


is.gd/Leren_518

 

by: pax

 
 
Thank you Leren, I used a very short head chain in between. The rest is careful elimination, often based on setties.

 

by: jgrab

 
 
So many mutual dependencies, but got along somehow with very CE (almost undistinguishable from head chains).

 

by: Susan

 
 
CE, settis and a chain in the end. Solved in 27 min, very nice one.

 

by: Fab

 
 
CE, settis and several SIs. Thanks

 

by: BP

Add to this thread
 
Settis, singles, wings + 1 SI. Thanks, Leren, very enjoyable.

by:Leren

 


Reserved for discussion of Andrew's puzzle. morl will love it :)

 

by: pax

 
 
In the end I needed a short head chain, is there a better way?
WCable.

 

by: morl

 
 
Yes, I like this one very much. It can be solved using an XY-loop in DH67 and an XY-Chain in GH4EH7.

 

by: Klaus

 
 

in those little-number-of-cells-with-little-number-of-candidates-but-still-a-chain-is-needed-situations, that arise from time to time, i find it always challenging and fun to spot the chain with the minimum number of cells involved.

here the best i can get is 6 cells.

 

by: morl

 
 
OK, now I see a shorter chain: One of B56 is 1, which means one of D6 and G5 is 3. Hence D5<>3.

 

by: Klaus

 
 

thats 5 cells, fine.

i think this pattern could be generalized to a common rule (the Sudoku guys surely have done this), so this solution can be seen as chainless.

 

by: Leren

 
 
Ben has previously dubbed this move a Confined Spaces SI.

 

by: Andrejs

 
 
After easy steps of standard tools I use swordfish on 8 and XY wing on 8. As result I get column 8 without 8 and I could continue solving. At the final stage I create simple chain (I can say head chain) to find solution of B6. The rest was trivial.

 

by: Andrejs

 
 
I am sorry! In my comment is mistake. Of course not XY wing but X wing.

 

by: Jens

Add to this thread
 
@morl:
Splashing, a peculiar situation in D5, where 3 is mobbed out.



Article created on 27-June-2010.
This page was last modified on 16-March-2020.
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  • 20:34
       - Ronny - 2 hours ago
  • 10min in 3rd try, after some stupid mistakes
       - sleepy - 12 hours ago
  • 20 minutes, 100th try
       - bold - 12 hours ago
  • Nice and easy - 16'19 not too bad.
       - Latimer - 1 day ago
  • 25 min, very nice, not easy, logic, settis, UR, chain in the end
       - hrw - 1 day ago
  • 21 min - very nice
       - Simsi - 1 day ago
  • Trallalalalalalaaalla
       - uli - 2 days ago
  • 12' - nice one
       - Coco - 2 days ago
  • 30 min - sehr schön
       - Rot - 2 days ago
  • <10', this one just went by
       - k - 3 days ago
  • 37' - needed a chain in the end
       - selecti - 3 days ago
  • 16 min - very nice
       - relijo - 3 days ago
  • 30min - easy going but chain close to the end when only 12345 missing
       - MoSeS - 3 days ago
  • 10 min
       - Cminor - 3 days ago
  • about 20 min, some breaks. logic and settis
       - EC - 3 days ago
  • 20:50 - rather straightforwar - in the end I needed a chain to solve the last remaining cells (could not finde the neccessary setti?)
       - joeB - 3 days ago
  • 9'30", not even settis needed; too easy for a 5*
       - martijn - 3 days ago
  • 34 min, I don't like chains
       - Boerny - 4 days ago
  • 24 min. Logic till the end.
       - D-Day - 4 days ago
  • sehr schön...33min...2.versuch
       - angelo74 - 4 days ago
  • 34 min
       - JulioFlor - 4 days ago
  • XY-chain at the end
       - Fab - 4 days ago
  • i'm the slowest one of all yet. do i get a price anyway?
       - emil - 4 days ago
  • great fun! thanks
       - CC - 4 days ago
  • Nice. CE and two XY-Chains. Thank you, Andrew.
       - morl - 4 days ago
  • 23'37 - not too bad.
       - Latimer - 4 days ago
  • 16:07 with a chain
       - Irene - 4 days ago
  • 30 min Chain in the end. Very nice
       - juehe - 4 days ago
  • 13 min - settis and a short chain in the end
       - Susan - 4 days ago
  • 30' really nice the chain at the end
       - rol - 4 days ago