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#768, March 9 - March 15:
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).
Oct 18th 2024
The solver can now handle Str8ts variants. Yay! The solver button on the player will now pass an appropriate parameter.
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.
All Access Supporters can load all puzzles from number 1.
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Puzzles 1 to 250 are available as Puzzle Packs, just $5.49.

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


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No full solutions please!

by: David

 10-Mar-2025, 14:31
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I have been unfairly removed from your site for no reason other than ""This may have inadvertently banned some people. I've always unbanned people when they contact me about this, so hoping is not too many affected. Sorry if this happened to you."

Have been a long time user since your Dragon Den days
 

by: Andrew Stuart

 11-Mar-2025, 08:42
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 Sorry for the lateness. Moving house. Please write to me and share the IP address the banned page showed you. Partly a mistake I made with the trigger and mostly the war on bots which never ceases. Will be very happy to restore your full access.
 

by: David

 11-Mar-2025, 14:15
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Looks like Paul's issue and mine are similar. I can get to Extreme Page but cannot log into the others
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by: Paul

 10-Mar-2025, 12:00
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1
Its not possible to reach your Main Page - ASPX 500 Error.
 

by: Andrew Stuart

 11-Mar-2025, 08:43
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Still trying to find out what's causing this, in particular why I can't reproduce or see logging or alerts (because of the error I suppose). Bare with me.
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by: hepa

 9-Mar-2025, 11:07
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2
 

by: OneGuess

 9-Mar-2025, 17:33
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 difficult for me but solved with a few short chains
 

by: charliepat

 10-Mar-2025, 14:00
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 After chain involving C9 it was a very nice puzzle. Hint: think low in C9
 

by: pax

 11-Mar-2025, 06:40
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 What are the rules of a jigsaw puzzle?
 

by: hepa

 11-Mar-2025, 11:45
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 @pax: Actually the same as for B- or BX-Str8ts, but the boxes don't have the shape "Square" but different ones. The box shape borders are shown above as thick dark blue lines.
 

by: hepa

 11-Mar-2025, 12:13
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 ... the B-Setti rules that a box tier and it crossing rows or Box stack and its crossing columns must have the same number of mandatory and excluded candidates can not be applied if the number of boxes vs. crossing lines differ.
And there are some other restrictions and additional solution methods. You may want to have a look at www.sudokuwiki.org/Daily_Jigsaw_Sudoku -> "Load in Solver" for an overview.
 

by: pax

 11-Mar-2025, 13:12
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 Thanks hepa, understood. On Android it's not always easy to see the difference between blue and black, but the logic behind is clear. This puzzle was not very difficult to solve, one head chain ...
Another nice kind of str8ts!
 

by: Ben

 11-Mar-2025, 16:02
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I did not need a chain. Just lots of very careful eliminations
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by: acs
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5
 The Weekly Str8ts X puzzle #160
 

by: Auwei

 9-Mar-2025, 15:08
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 Quite tough, VCE. towards the end the wrong choice for E5 shows that exactly the chosen value will be missing in H and 9, though mandatory. Many thanks to acs!
 

by: pax

 10-Mar-2025, 17:50
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 Very nice difficulty level, with head chains solvable.
 

by: BP

 10-Mar-2025, 19:06
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Agree with pax, 3 short SIs/HCs.
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by: acs
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2
 The Weekly Str8ts B puzzle #160
 

by: BP

 9-Mar-2025, 12:42
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 Develops beautifully with standard B tools plus a really nice UR. Many thanks!
 

by: optimator

 10-Mar-2025, 14:17
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 just as BP
 

by: Hel

 11-Mar-2025, 13:32
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Like BP. Thanks a lot!
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by: acs
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 The Weekly Str8ts puzzle #768
 

by: Klaus

 9-Mar-2025, 06:55
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maybe B7=8 helps
 

by: Nessi

 9-Mar-2025, 08:14
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 If not, additional G9=1 and finally D6=9 will solve the puzzle
 

by: tbr

 9-Mar-2025, 12:11
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 It does help. How is a 7-field wing called?
 

by: hp

 9-Mar-2025, 12:50
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 in my opinion is officially labelled up to the starfish (5x5),
beyond that, imagination is required, I think names like sea monster or ray have been suggested for larger fish in the past
 

by: kris

 9-Mar-2025, 13:55
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 With Klaus's hint it's quite enjoyable but still challenging, thanks a lot!
I didn't spot a sea monster, the shortest path I found was:
CE col 6
Setti 5
6-field UR -> CE solves F5
swordfish on 1
4-field UR
x-wing and Setti on 8
 

by: OneGuess

 9-Mar-2025, 13:58
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 to get started (without using candidates): only 2 options for 9 in column 4 - and to make progress I went J
looong chain to prove, that C1 cannot be 9
rest solves quickly with a few setties
 

by: kris

 9-Mar-2025, 14:45
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 I correct myself, both URs are not needed, the puzzle is easier than I thought first (with Klaus's hint)
 

by: Jan

 9-Mar-2025, 15:25
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 There is feasable head chain to decide high/low in D12.

 

by: Marya

 9-Mar-2025, 16:13
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 After Klaus‘ hint, setti on 1 and several others made it collapse.
 

by: hoke

 10-Mar-2025, 14:29
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 @Jan: good observation!
@all (without hints): HC for D12 low in detail: D1=9, D2=8, J4=9 (single in 4), J2=7, G12=45, G9=1, C7=1 (no 9 in C), which removes the last 9 in B.
Some progress, but still not solved.
 

by: aw

 10-Mar-2025, 16:33
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 Finally done, without Klaus´ hint, but with an endless and embarrassing chain of chains (B3 not 9, D1 not 9, G5 not 1, F7 not 9, A2 not 1, B3 not 6, C3 not 6; besides this only some x-wings in CF).

At least it was all trial and error - did I mention I hate lucky guesses?
<:-)
 

by: Klaus

 10-Mar-2025, 17:34
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 Hi aw,

if you try, failure is not guaranteed, is it? so you can be unlucky and get lucky. how do you deal with that?
 

by: hp

 10-Mar-2025, 18:06
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 Shortest path for me with hint Klaus or chain D12 low:
Setti 5 and 1, xwing 8 followed by Setti 8
 

by: Jan

 10-Mar-2025, 21:36
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 Please explain how setti 5 and 1 work in this situation - for me, roA and column 3 make this impossible.
 

by: aw

 11-Mar-2025, 08:58
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 @Klaus: That´s my problem, indeed - but it seems to me, that in most cases the "lucky" chain gets so long that I quit and try the alternative :-)
 

by: kris

 11-Mar-2025, 10:00
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 @Jan: after CE col 6 -> DE6=789
all rows and so cols must contain 5 -> AB6=45 -> B1=9single -> C789≠4
now 6 rows and so cols must contain 1 -> col 7 contains 1
(setti on 1 can be replaced by a swordfish on CEG579, for me easier to spot)
 

by: kris

 11-Mar-2025, 10:47
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 @Jan + hp: I meant with Klaus's hint – only with D12 low, I don't see setti 5 either
 

by: hoke

 11-Mar-2025, 19:37
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 Perhaps we should open a new thread "without hints".
There is a chain that removes 4 from F5. It does not solve the puzzle nor lead to much progress, but it is really nice, so here it is.
F5=4, Swordfish on 1 in EFG removes 1s from H so H2=1, removes 9 from B7 and 1s from C, so that we get an Xwing 9 in BC.
=> A3=7, A6=1, B6=2, A7=2, F7=1, B2=3 (single in col 2), B5=7, G5=1 and row E has no 1 left.
 

by: hp

 12-Mar-2025, 08:13
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 @ Jan. sorry, meant with hint Klaus
 

by: hoke

 13-Mar-2025, 10:46
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After D12 low, without hint.
H6 cannot be 4. If so, 5 is missing in col 6, but AB6 must be 12 and 5 cannot be missing in any row.
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by: acs
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5
 The Weekly Str8ts BX puzzle #160
 

by: witch

 9-Mar-2025, 10:58
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 very nice - one chain
 

by: kris

 9-Mar-2025, 11:56
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 yes, nice, no chain needed, just CE, BX-power and (box-)setti
 

by: Martinus

 9-Mar-2025, 12:36
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 Like kris, box 9 is important. Thanks a lot!
 

by: optimator

 10-Mar-2025, 13:35
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 nice, no chain needed
 

by: Hel

 11-Mar-2025, 15:19
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 Agree, no chin needed. For me DE6 was the key ...
 

by: kmr

 11-Mar-2025, 19:53
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 Like Hel. However, I think it is a beast.
 

by: BP

 11-Mar-2025, 21:41
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Like kris and othets. Many thanks!
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Page created on 27-June-2010.
All puzzles not marked 'guest compiler' on this site are trademarked and cannot be reproduced without permission.
Copyright Jeff Widderich and Andrew Stuart @ Syndicated Puzzles, Privacy, 2007-2024
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  • >2 hours, impossible for me without the help of Klaus and Nessi. Thank you!
    - epibrator
  • only with all the hints....
    - Emma
  • Mein Fehler im ersten Anlauf war: ich habe in der G Reihe die Felder 4-9 mit 1-5 besetzt und bin (natürlich) gescheitert. Tipps - Danke
    - b*k*
  • die beste hilfe ist die von nessi, D6 ist 9. das reicht um das rätsel zu lösen
    - dersoloist
  • Thanks for all the hints and for all the wonderful different puzzles :) The X, BX, B and jigsaw keep twisting my mind :)
    - Silke
  • Solved without help/hints, but a real beast!
    - pax
  • Even with Nessi's and Klaus' hints, not too easy. Am I getting older or are recently the 5* Str8ts puzzles more 6* or 7*???
    - Ute
  • 1 hr with only Klaus's hint. Tough.
    - Maven
  • Schwer! Gestern nach ein paar Stunden ohne Tipps aufgegeben. Schaue jetzt auf die Hinweise und auf ein Neues!
    - b*k*
  • Sehr schweres Rätsel. Nur D12=32 war bei mir richtig. Dank der 3 Hinweise von Klaus und Nessie gelöst. Danke
    - S. Walt
  • yesterday i am failed. needed both hints today, thanx to klaus and nessi.
    - dersoloist
  • 1h35' Some guesses led to solution. If I cannot"calculate" it I have no fun.
    - Manfred
  • 90', needed Klaus' and Nessies hints, thnx, w/o not solvable for me.
    - UZ
  • nice!
    - meli
  • 30 min with hint from Klaus. Enjoyable using no chains or special tools.
    - Cosmanita
  • enjoyable with the hints
    - Alex
  • with all hints and 1 chain. not my most loved
    - chris1
  • Without the hints nearly no progress. Early hints helped a bit, but after hard work nevertheless stucked. Finally Setti 5 hint did the rest.
    - Fred
  • with hints and solver just two minutes...
    - EC
  • Gewürge ohne Ende. Settis en masse. Mir selber dankbar, dass ich nicht einfach aufgebe.
    - web1
  • 39 min - Danke an Klaus und Nessi
    - Rot
  • 1h50' 2. att., with Klaus and Nessis hints.!n col 8 helped 123. G1+2 a single - 2.att was it. A nice and elegant one.Thank you Andrew
    - barbara
  • @web1: wenn man 3 Std. selbst "d'ran gearbeitet" hat ist man sehr dankbar für die kleinen Helferlein...
    - Susi
  • 33' Even with all the hints not too easy
    - Axel
  • that's the way. Geliehenes Wissen statt selbst dran arbeiten.
    - web1
  • no fun at all for me with all the guesses (or using the hints)
    - schmidl
  • with all hints on 3rd attempt in 21' w/o hints no chance
    - easydoesit
  • 53' - with the first hint from Klaus
    - COM
  • 30' with all hints, but then it's straightforward IMHO
    - l.
  • 1 h of guessing and chaining... Thank you Klaus and Nessi, couldn't have done it without your hints.
    - Amoena
  • 14 min - with all hints and on third attempt, Undoable for me without hints.
    - Beate
  • 1 h
    - Loser
  • 40 min with all hints from Klaus and Nessi, thx, additional to the hints many 50:50 decisions - awful :(
    - Susi
  • 1:53:50 schon wieder verdammt schwer!!!
    - zoo-pony (Tartlau)
  • 3h, needed several HC, not really satisfying solution.
    - E.H.
  • 46 min - a real challenge. Now I know, why there are no comments yet
    - Nessi