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#843, August 16 - August 22:
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.
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Discussion...
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Please email me if you experience problems or bugs. Cheers, Andrew Stuart


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by: hepa

 16-Aug-2026, 11:20
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1
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5
 

by: kris

 16-Aug-2026, 14:55
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Interesting puzzle: a lot of CE, one box-wing, no setti, no chains needed. Thanks once again, hepa!
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by: acs
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2
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5
 The Weekly Str8ts puzzle #843
 

by: hp

 16-Aug-2026, 10:05
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 hard work, after some Settis and xwing6 see no progress
long chain shows me that D8 must be 9.
maybe someone find a smarter way
 

by: ThomasF

 16-Aug-2026, 10:14
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 like hp, settis, CE, wings abd stuck. With the right choice on D8 it becomes easy, but hard to disprove the wrong choice.
 

by: kris

 16-Aug-2026, 11:50
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 after setti 8,2,7 and 3/5 (-> no 1 in col 1), two micro chains solve it:
For both options of AB1==54 or 23 -> same digits on AB2 (with help of an optional x-wing)
For both options 5 on A1 or D1 -> same digit on D2
 

by: kris

 16-Aug-2026, 13:35
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 I should have mentioned hp's x-wing on 6 and an important CE-elimination on G2 before
 

by: Ikey

 16-Aug-2026, 13:57
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 @kris: Excellent observstion
 

by: BP

 16-Aug-2026, 16:10
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Standard tools plus two SIs/micro chains, similar to kris, I think.
If DE2=34 then DE1=25, contradiction.
If B2=4 then A2=3 and 3 in AB1 and in AB6, contradiction.
Many thanks, Andrew!
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by: acs
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 The Weekly Str8ts BX puzzle #235
 

by: optimator

 16-Aug-2026, 11:26
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 difficult: I made a lucky guess on E5
 

by: kris

 16-Aug-2026, 21:26
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VERY hard nut; after lots of VCE-steps and setti 3, at 11 solved cells, I needed quite a long chain to disprove E5==6; after that, it's not too difficult.
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by: acs
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 The Weekly Str8ts X puzzle #235
 

by: AndreasM

 16-Aug-2026, 15:31
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 Solvable even cleanly, but only with a huge effort. It took me close to three hours. Essentially, it is about figuring out the interrelationships between the ranges in column 5 on the one hand and the ranges in rows F and G on the other hand. At any rate, considerably easier (if that is the word) than last week’s puzzle. Thank you for that.
 

by: AndreasM

 16-Aug-2026, 15:38
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 Correction to the foregoing: It should better read 'between the ranges in columns 6 and 7 (not column 5) and ...‘
 

by: optimator

 17-Aug-2026, 09:52
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 hours for me also, but mostly CE and settis. I needed a h/l guess on D6 to finish
 

by: aw

 17-Aug-2026, 11:00
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 Like @optimator - but still unable to falsify the alternative (which, for me, is part of a guess <:-)
 

by: AndreasM

 17-Aug-2026, 13:27
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If a remember it correctly, my aforementioned analysis of the ranges showed that there is no 9 in row G and neither in column 6. This leaves F4, E5 and B8 as possible positions of '7', '8' and '9' along the /-diagonal (of course the ‚7‘ is in cell E5). And with this knowledge there should be no need for guessing.
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by: acs
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 The Weekly Str8ts B puzzle #235
 

by: optimator

 17-Aug-2026, 10:09
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not so hard: HJ7 were the key
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  • 32:12 no hints but all tools needed, 2nd try
    - fred
  • Mit settis 2 bis 8 und E2 richtig erkannt. Interessantes Rätsel.
    - S. Walt
  • 39'
    - Maven
  • Nice with the good observations of BP.
    - jgrab
  • @hhclimb: right – welcome :)
    - kris
  • 37'. No problems, but I don't know why not. Maybe I made a lucky mistake.
    - ataraxia
  • Thanks to BP no guessing.
    - Cleo
  • 32:24 - with a Hi/Lo decision im D8.
    - Latimer
  • 18 min, dank hp
    - humpti dumpti
  • 39 min - mit dem Tipp von hp und sehr viel Logik
    - Rot
  • @kris: good job!! So no "decision" is necessary,its pure logic. Thanks
    - hhclimb
  • 3/4 h, needed hp's hint in the end
    - A B Traherne
  • 23 min with hp's hint
    - Alex
  • 14 min - having made the same mistake again and again, finally solved
    - Susan
  • 47 min. - settis and in the end with hp's hint; thank you :)
    - Nessie
  • 1,5 on the second go, hilo in D8
    - notsonewbie
  • 56'35" hi lo in d8
    - chris
  • 1:15 - but I did it ;-)
    - ingo
  • CA of rows A and B, some settis, and right choice in D8.
    - MrL
  • one guess, not a lucky one, and the puzzle was not to solve anymore, you are all so smart people
    - puzzled one
  • 40 min. Wer es mit Settis probiert, sollte mit 8 und 9 anfangen.
    - Axel
  • 35', was stuck for a while...
    - l.
  • wings, settis, but needed a h/l guess on D8
    - optimator
  • 45 min-So many tools and the logic runs :)
    - effchen
  • 50 min; settis, wings and other logic, but needed also a hi/lo-decision in column 2 (I prefer logic only)
    - Michael
  • 45' - needed a long positive chain for a hi/lo decision
    - COM
  • another one i did
    - alopex
  • 1 h, only BCA!
    - H.E.
  • 42‘
    - A. Friend
  • 25'. hi/lo in 2 ;-) I liked it
    - MartinL
  • 36 min - h/l E8/E9 - nice one
    - Susi
  • Filling cells, firework of settis, careful eliomination and hi/lo decision in D8.
    - Solver_4