Get the Str8ts App
Welcome to the home of Str8ts
Str8ts Explained
Play Here...
Android & Apple Apps
Our Service
Print Version
Page Index

#722, April 21 - April 27:
The Weekly Extreme Str8ts Puzzle

by Andrew Stuart
WARNING: This is the Weekly 'Extreme' Str8ts.
Only attempt this puzzle if you have time and patience.
Using the solver will not help you. (much).
Archive
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.
Share and Enjoy
Puzzles 1 to 250 are available as Puzzle Packs, just $5.49. Pack 3, 4 and 5 just released!

Discussion...
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


Your Name or Handle

Your comment or question

Enter these letters arrow

Please keep your comments relevant to this page.
To state your solve time use the smaller form at the top right of this page.
Line breaks and paragraphs are automatically converted. No need to use <p> or <br> tags.
No full solutions please!

by: kris

 24-Apr-2024, 17:49  
Yes, tough one, finally I got through. VCE and checking the consequences of both options for 9 in box 8 and for 3/8 on G5 allowed some decisive eliminations in rows H and J. Thank you, hone!
 

by: kris

 24-Apr-2024, 17:51 Add to this thread
 
sorry, the above was meant as comment to hone's puzzle

by: hone

 22-Apr-2024, 11:20  
is.gd/hone722_Clothoid_B
 

by: Susan

 23-Apr-2024, 15:46  
 
A hard nut for me

 

by: BP

 24-Apr-2024, 15:42  
 
Hard for me, too. After 27 solved cells I needed a head chain. Many thanks, hone!

 

by: pets

 25-Apr-2024, 14:00  
 
What a beast! Took me ages to solve the 1st digit. Needed an early chain for J4 -from there it was a chainless but really tough. Thank you, hone - excellent fun!

 

by: Auwei

 25-Apr-2024, 14:14 Add to this thread
 
Metoo, after 27 solved cells I have headache, but no clue for a short way out. But I liked this puzzle, thanks to hone!

by: kst

 21-Apr-2024, 07:36  
 

by: BP

 21-Apr-2024, 19:18  
 
Perfect level of difficulty. CE + B Setti power + one y-wing and a short SI in cols 5,6 to finish. Many thanks, kst!

 

by: optimator

 23-Apr-2024, 14:18 Add to this thread
 
It didn't have anything too hard, but it took me a very long time, with a chain with the final 123s.

by: kst

 21-Apr-2024, 07:35  
 

by: kmr

 21-Apr-2024, 09:31  
 
Very nice, not hard, needs only VCE and settis. Perfect for forgetting the cold weather in Munich. Thank you, kst.

 

by: tg

 21-Apr-2024, 12:42  
 
Chainfree. Not too hard.

 

by: optimator

 23-Apr-2024, 14:28  
 
10'

 

by: Susan

 23-Apr-2024, 16:25  
 
Nice one, not too hard

 

by: BP

 25-Apr-2024, 07:47 Add to this thread
 
At last a relaxing one :-) Nice and quick.

by: kst

 21-Apr-2024, 07:34  
 

by: jgrab

 21-Apr-2024, 11:07  
 
42 min; a very elegant challenge!Many Settis,m and then VCE.

 

by: pax

 22-Apr-2024, 07:20  
 
Agreed, jgrab. A very nice one. Thank you, kst!

 

by: Jan

 22-Apr-2024, 13:18  
 
Indeed! With eight cells solved, there is a head chain that shows that, whether a certain cell is 1 or not, another cell always has the same value. That is enough to solve, requiring a lot of x-power on the way.

 

by: BP

 24-Apr-2024, 09:59  
 
I found this one quite hard. Needed two small HC/SIs on the upper diagonals. Many thanks!

 

by: optimator

 24-Apr-2024, 15:10  
 
I needed a long chain on A1

 

by: Jan

 25-Apr-2024, 08:15 Add to this thread
 
Consider the stand-out candidate in B8 and what that means for row A.

by: kst

 21-Apr-2024, 07:34  
 

by: Susan

 21-Apr-2024, 11:53  
 
Nice and easy, not really a 5Star

 

by: Frank

 22-Apr-2024, 08:13  
 
Easy? Any hints? What do I overlook?

 

by: Auwei

 22-Apr-2024, 09:20  
 
@Frank: check corner J9; low values lead to conflict in F

 

by: ThomasF

 22-Apr-2024, 14:05  
 
nice and easy, thanks

 

by: kmr

 22-Apr-2024, 17:30  
 
Develops smoothly, thank you, kst.

 

by: Maven

 23-Apr-2024, 22:50  
 
3.5 minutes, WC
Kind of a nice brrak actually, thanks!

 

by: optimator

 24-Apr-2024, 11:11  
 
Like Frank, I didn't see Auwei's hint

 

by: Hel

 24-Apr-2024, 14:48  
 
32' WC, thanks

 

by: BP

 24-Apr-2024, 19:35 Add to this thread
 
Found it quite difficult, definitely a 5* for me. Thanks for the clever hint, Auwei!

by: MartinL

 21-Apr-2024, 06:47  
After some settis and elimination, consider, what happens to 7s (setti), if there was a 8 in C7.
 

by: Klaus

 21-Apr-2024, 07:01  
 
Hi MartinL,

i dont see what you mean.

But assuming E46 being a little high, leads to an immediate contradiction to Setti on 4, and thats enough for standard tools.

 

by: BP

 21-Apr-2024, 10:21  
 
Excellent puzzle. We used two setti considerations, on 4 like Klaus and on 7 like MartinL. Many thanks, Andrew!

 

by: jgrab

 21-Apr-2024, 10:24  
 
I think that MartinL means that C7 can't be 8 due to Setti 7 contradiction. This solves C9 and opens some other paths. Sounds reasonable.

 

by: Jan

 21-Apr-2024, 10:33  
 
Yeah, the first stop comes at five solved cells, and I cannot see a setti in that position. I'll see where Klaus's hint leads me.

 

by: hp

 21-Apr-2024, 15:10  
 
hard work for me
needed Klaus hint and MartinL hint
after Klaus hint (E456 must be 123) I could solve two more after the first five digits, then the hint MartinL (no 8 in C7) then still several tools until the solution
maybe overlooked something after Klaus hint?!

 

by: Jan

 22-Apr-2024, 10:07  
 
The sequence of both of these considerations/hints worked for me, it was reasonably easy afterwards.

 

by: Cosmanita

 22-Apr-2024, 20:13  
 
After the two setti hints, a x-wing regarding 1 in CE45 helped further. It took me ages to see it.

 

by: Jan

 23-Apr-2024, 07:18  
 
Yes, quite surprising how that suddenly appears, isn't it?

 

by: Ben

 23-Apr-2024, 14:42  
 
I can't see the Setti-7 contradiction at all. Would love for someone to explain it.

However, I do agree with Klaus. The Setti-4 contradiction is all you need to solve the puzzle with standard tools.

 

by: BP

 23-Apr-2024, 15:48  
 
@Ben: If I remember correctly:
C7=8 => D7=7, C8=7, A8<>7. So 7 is in col 7 and therefore in all cols, but not in row A. [At that point already A6=1.]
I would call that a setti consideration with SI. I missed the completely standard way to finish the puzzle.

 

by: Ben

 23-Apr-2024, 18:01  
 
Thanks BP. That makes perfect sense.

However, the bit I'm missing is how you determined that A6=1. For me, after doing basic moves it was still 13. By applying the Setti-4 consideration, E6=3, A6=1. But at that point, the problem can be solved with simpler logic that the Setti-7 consideration.

 

by: BP

 23-Apr-2024, 19:15  
 
I did it after the setti-4-consideration, because I missed the "simpler logic". Too simple for me :-)

 

by: Ben

 23-Apr-2024, 21:23  
 
I missed it first time round also. But after Klaus's comment, I redid the puzzle, and was impressed with the subtle simplicity.

 

by: hp

 24-Apr-2024, 15:46  
 
@ Ben:
i had the same way as BP, need the Setti 7 contradicition.
would be interested how you solve this after the setti 4 consiceration with simpler logic.
What is this "simpler logic" at this point?

 

by: Ben

 24-Apr-2024, 18:54  
 
@hp,

Ell, simpler is subjective. But after the setti 4 contradiction sets A6=1, removing several 7's. You are left with a starfish.

 

by: hp

 25-Apr-2024, 17:38 Add to this thread
 
absolutely right, I didn't see it, must have been blind
in this respect I agree, simpler logic, because standard tool
Thanks for the clarification

Page created on 27-June-2010.
This page was last modified on 08-Jan-2023.
All puzzles on this site are trademarked and cannot be reproduced without permission.
Copyright Syndicated Puzzles Inc, 2010-2023
Caution!
Boast or Rant!
Tell everyone if you solved this puzzle, how long it took or if you gave up.
Name or handle:

Comment,
including time to solve (or not :)


For questions or discussion, please use the main comment form.
  • with all hints
    - AB Traherne
  • several days without success without the hints - with the hints I needed 30 min
    - Alex
  • I needed 2 hints
    - optimator
  • 29' im 2. Anlauf, ohne "hints und kunts". Sefh schwer
    - zoo-pony
  • 31 min on ump-teenth try using both hints. CE, settis and xwings. Very tough, very nice
    - juehe
  • neuer (minus)rekord, 3 tage. und nur mit der hilfe.
    - dersoloist
  • almost 2 hours :(
    - selecti
  • 24 min. - with all the hints
    - tbr
  • about 2 hours with Klaus' hint - nice level, but I needed 3 attempts because of mistakes
    - Michael
  • 13 min.
    - Nessi
  • Failed first try after 30' then used the hints. After that, a UC broke it open and 11' second try
    - Maven
  • 3 Stunden Rätselspaß, settis, Spalte 3 ausprobiert. Danke
    - S. Walt
  • Made it only, With all the hints, Thx for these, Hope next I finish, Without by myself.
    - E.H.
  • only with hints
    - chris
  • 15 min: 3. Versuch, mit Tipps
    - humpti dumpti
  • 37 min.- very nice with Klaus + Martins hints
    - Nessie
  • Nice Puzzle with the hints, thanks.
    - hoke
  • 80 min, settis, wings, big fish, nicht einfach
    - Torsten&Irina
  • Several attempts needed after using Klaus' and Martins hints. Many possibilities remaining...
    - Susi
  • 68' cool hint from Klaus
    - Richard
  • 90' - tricky, lots of chains, did not find a smooth path
    - COM
  • 30 min; nice little oberservation by Klaus.
    - jgrab
  • 56' longest puzzle so far for me
    - l.
  • 39', very nice
    - pax
  • 47' with Klaus' hint
    - Hel
  • 1h12min difficult for me but used all 7 which helped
    - OneGuess
  • 32'.WC. Nice one and a bit tricky, but not too much :-)
    - MartinL