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#820, March 8 - March 14:
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: hepa

 8-Mar-2026, 11:13
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by: Only Human

 8-Mar-2026, 14:38
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 had to use a few short chains - wonderful puzzle, again, thank you hepa
 

by: aw

 9-Mar-2026, 11:23
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 Gee - the first time I solved hepa's Jigsaw before the rest of the set :-)
Thanks a lot!
 

by: kris

 9-Mar-2026, 14:34
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 Very nice! Needed a micro chain at the end.
 

by: Auwei

 9-Mar-2026, 15:05
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Once more: just beautiful, thanks to hepa!
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by: acs
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 The Weekly Str8ts B puzzle #212
 

by: optimator

 9-Mar-2026, 05:37
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 1' finally one I can do this week.
 

by: EC

 9-Mar-2026, 20:44
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logicaly done in a few minutes
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by: acs
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 The Weekly Str8ts puzzle #820
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by: acs
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 The Weekly Str8ts BX puzzle #212
 

by: Ollie

 8-Mar-2026, 14:35
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 Way too hard for me. Needed 5 long chains :-(
 

by: optimator

 8-Mar-2026, 14:46
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 twice I've gotten to a point where I don't get a solution but I can't see my mistake
 

by: AndreasM

 9-Mar-2026, 10:43
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 Essentially, the puzzle is about the ranges in column 7. After, admittedly, some work both options lead to the same digit in A3. Then you've got something to work with. The puzzle is interesting without being frustrating. Thank you!
 

by: kris

 9-Mar-2026, 15:29
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 @AndreasM: Solving ranges of column 7 is quite easy: In box 6 and so in column 7 (box setti) there must be missing exactly 2 digits of 6789. That allows only one single combination on GHJ7 and clears all ranges. However after that I find it still very demanding and don't see a chainless way.
 

by: AndreasM

 9-Mar-2026, 16:49
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@kris: Digits 8 and 9 missing in box 6 was easy to verify, agreed. But in order to make inferences on column 7 you need information on box 3 which I didn't have at an early stage. As to chains, I find this concept slightly doubtful, if applied to BX-puzzles. The richness of the BX-rules allows to draw far-reaching conclusions based on very few assumptions. Of course, you may call this chains, even if there are comparatively few steps involved. The complexity of BX-puzzle solving stems from the broadness of possible inferences, not from their depth.
And yes, the puzzle is not exactly easy.
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by: acs
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 The Weekly Str8ts X puzzle #212
 

by: Only Human

 8-Mar-2026, 08:28
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solved with a few headchains - wonderful X puzzle (again)
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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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  • @Eumel -> Beate made decisions in col 1.
    - Jens
  • 41 min im 5. Versuch - ich fand es schwer
    - Rot
  • 30 min
    - relijo
  • 3 tries, keep running into errors...
    - martijn
  • Needed HC. No solver, no hint.
    - H.E.
  • der Solist, nicht Walt, sorry
    - biggi
  • @walt: auf keinen Fall,danke ;-)
    - biggi
  • habs gelöst, bitte die A4 nicht verraten
    - dersoloist
  • kann das sein, dass A4 die 8 ist?
    - dersoloist
  • 1.5 hr with 2 long chains
    - Maven
  • A hint like "make a desicion in XY" is not a hint.
    - Fred
  • solved. but not amused
    - chris1
  • 33 min - one guess, then smooth sailing
    - Stef
  • Sehr schwer, A4 war der Schlüssel, dann viele x-wings und settis.
    - S. Walt
  • Was ist denn Beates Tipp?
    - Eumel
  • 45 min. Like Beate. Too much guessing/HC. X wings on 3s and 7s help but do not solve.
    - Cleo
  • @Beate Thanks for your tipp.
    - Jens
  • 28 min on maybe 4th attempt... started with Alex' hint and had to made a choice in F1 later on. Nice puzzle, but too hard for me.
    - Beate
  • 1:34 h; really hard one, but nice
    - Nessie
  • 68' - needed several chain, did not find a "logic" solution
    - COM
  • 29 min, hi-lo decision in col. 1 did it for me
    - Alex
  • 42 min, a hard nut, but solvable by standard tools
    - fred
  • 1:08 - wow, a really 5☆, lot of fun :)
    - Susi
  • 1:20h, what a challenge. VCE in upper left corner
    - flowerwaffle
  • 34', nice for of lazy sunday morning :-)
    - MartinL
  • 1:02:11 nicht ganz leicht
    - zoo-pony (Tartlau)
  • 18 min - a real challenge, nice
    - Nessi
  • Hi/Lo decision on column 1, settis and careful elimination.
    - Solver_4
  • 45', one chain
    - AB Traherne
  • 55' early morning
    - pax