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#806, November 30 - December 6:
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...
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

 30-Nov-2025, 11:08
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4
 

by: kris

 30-Nov-2025, 15:50
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 very hard nut, stuck at 5 solved cells – after 2 hours ore more ...
 

by: OneGuess

 30-Nov-2025, 19:21
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 tough but amazing puzzle - D23 low helped to speed up things
 

by: BP

 30-Nov-2025, 20:49
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 Another phantastic challenge. Chainfree. After 5 solved cells we used a couple of Settis, later a combined Setti to decide hi/lo in D. Many thanks, hepa, and a nice start into december for everyone!
 

by: BP

 30-Nov-2025, 21:03
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 @kris: I think after 5 solved cells and several settis the setti results helped with col 4.
 

by: kris

 1-Dec-2025, 11:45
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 Thank you BP (and of course hepa), finally did it with a bunch of settis, sometimes I suffer from temporary blindness ... but it was still quite demanding.
 

by: aw

 3-Dec-2025, 13:52
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 Puh, finally done (without hint :-) - missed some of the "smeared" wings for a long time and needed some chains around F6/G7 for entering the puzzle.
 

by: pax

 3-Dec-2025, 15:26
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With careful work no lang head chains or hints needed. Another masterpiece, key are in fact setties and wings.
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by: acs
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 The Weekly Str8ts puzzle #806
 

by: kris

 30-Nov-2025, 11:31
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 Amazing puzzle, it's all about uniqueness. Step by step, I found seven URs. No chains, no guesses.
 

by: BP

 30-Nov-2025, 19:12
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 Amazing indeed. We used 5 URs and 2 obvious setti considerations. Many thanks, Andrew!
 

by: hp

 1-Dec-2025, 19:11
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 Saw no durable URs.
Could you please specify
 

by: BP

 1-Dec-2025, 19:45
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 @hp: Here our main steps:

UR: 4 in ABCDE1 and 4 in GHJ2, otherwise GHJ1 and GHJ2 could be swapped.

UR: H5=1, otherwise H125 and J125 could be swapped.

UR: F3<>4, otherwise it could be substituted by F3=2. (I think this UR wasn't neccessary.)

UR: D4<>1, otherwise AD67=24.

UR: D6<>2, otherwise AD67=24. (At least I think that was the reason.)

Setti consideration on 4: 4 in H39 and 4 missing in col 3 or col 9 implies: 4 in no other cell of cols 3,9, esp. C3<>4.

Setti consideration: H9=4 => contradiction on Setti 8.

Maybe kris likes to share the other two URs. We missed them.
 

by: kris

 1-Dec-2025, 23:24
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 @hp and BP: My very cumbersome and unnecessarily long way – as I see now – was (from where the solver stops, without solver steps):
x-wing 3 on HJ12 -> H4≠3
F7≠7, otherwise UR 78 on FH 79
H12≠1, otherwise UR 123 on GHJ 12
H4≠9, H9≠9, otherwise UR 67 on G47 H67 J46
Hidden pair 79 on H67 -> ≠6
H5=1, otherwise UR 234 on HJ 125 -> Hidden pair 23 on H12
B1=4, otherwise UR 1234 on GHJ 12
D4=4, otherwise UR 24 on AD 67
H3=4, otherwise UR 24 on F3

Actually, only 3 URs are completely sufficient! (even no wing, hidden pair nore setti needed)
#1. B1=4, otherwise UR, GHJ 1 and GHJ 2 could be swapped
#2. D4=4, otherwise UR 24 on AD 67
#3. H3=4, otherwise UR 24 on F3

Funny, isn't it?
Thanks a lot, BP, for making me analyze the puzzle again!
 

by: hoke

 2-Dec-2025, 19:37
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 Amazing indeed
 

by: Rudik

 2-Dec-2025, 22:58
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 Without taking into consideration all those lengthy discussions about URs, just choose H3=4 instead of 6 and the whole thing falls apart. Sorry.
 

by: kris

 2-Dec-2025, 23:32
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 Rudik: You should understand that there are two different types of Str8ts solvers: Some – like you – are satisfied if they find the solution by any means necessary, even if it's with a lucky guess. Others want to avoid this and look for a strictly logical solution without guessing (in this case, eliminating 6 from H3).
 

by: BP

 3-Dec-2025, 06:24
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 Very well said, kris!
 

by: proteus

 3-Dec-2025, 13:06
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once you see the URs, i find this puzzle extremely elegant. i didn't think it was solvable without chains. this might also be a good opportunity to recommend again BP's excellent tutorial on UR strategies, which can be found in the left side bar under 'Str8ts explained'.
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by: acs
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 The Weekly Str8ts B puzzle #198
 

by: tg

 1-Dec-2025, 11:22
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 Nice and straight forward. - Thanks.
 

by: optimator

 1-Dec-2025, 11:41
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 5'
 

by: BP

 1-Dec-2025, 19:45
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 Quick and easy.
 

by: Martinus

 1-Dec-2025, 20:06
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 Yes, easy going. Thanks.
 

by: EC

 2-Dec-2025, 09:19
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just logic
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by: acs
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 The Weekly Str8ts X puzzle #198
 

by: tg

 1-Dec-2025, 11:23
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 No chance for me.
 

by: OneGuess

 1-Dec-2025, 16:55
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 sorry for the spoiler - but difficult as it seams, and 4 in the center cross might help to speed up things
 

by: 10Guess

 2-Dec-2025, 15:12
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 think this was the most difficult stra8ts I ever did
 

by: proteus

 3-Dec-2025, 13:00
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This is a puzzle that is worth the name 'extreme str8ts'. I even needed two hints from by CPU to be able to solve it (SPOILER: B1=2, D8=3), and I don't see any logical way without chains.
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by: acs
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 The Weekly Str8ts BX puzzle #198
 

by: Cosmanita

 30-Nov-2025, 07:30
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 Very nice one, BX Power. At the end I used a SI to decide that G3 is not 2.
 

by: Martinus

 30-Nov-2025, 08:58
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 Similar to cosmanita. Nice. Thanks!
 

by: ThomasF

 30-Nov-2025, 11:26
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 Very nice, BX and some wings
 

by: Pete

 30-Nov-2025, 11:59
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 At the end I used a UR on GH159 instead of SI.
 

by: jgrab

 30-Nov-2025, 13:15
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 Nice. Used Cosmanita's hint to avoid brain work.
 

by: kmr

 30-Nov-2025, 14:20
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 Like Pete. Develops smoothly, very nice one.
 

by: optimator

 30-Nov-2025, 16:16
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took time at the end, similar to Cosmanita
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Page created on 27-June-2010.
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Copyright Jeff Widderich and Andrew Stuart @ Syndicated Puzzles, Privacy, 2007-2024
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  • Bis H3=4oder6 bin ich auch gekommen. Dann mit Hint gelöst. Schwer.
    - S. Walt
  • Read the main comment section. Some URs, that's all.
    - Vishi
  • 39 min, needed a guess on D5
    - Alex
  • B1 was key. Regards to b*k*
    - AB_Traherne
  • HC in Col. 3 needed.
    - H.E.
  • took me ages - key was a guessing on E8
    - Ske
  • A big UR, a sneaky UR-with-short-chain, and a finish with a long chain. Had to sleep on it overnight.
    - puzzled
  • hard for me: I needed a chain on H3
    - optimator
  • 3rd try in 14' with guess on H3 enjoyable nonetheless
    - easydoesit
  • to Cleo: you are right - B1
    - b*k*
  • A few chains
    - Greg
  • with lucky guess
    - chris1
  • H3 soved it. Some might call it a chain, I call it lucky guess.
    - selecti
  • 16 min. after a lucky guess on H3. Would have preferred a logic-based solution though.
    - Amoena
  • 36' H3 was key!
    - Jim
  • right decision in H3 makes it possible in < 10 min
    - EC
  • 21 min - lucky guess on D5
    - Beate
  • 30 min - glücklich geraten
    - Rot
  • 51" with hint jgrad and b*k* (think he meant B1)
    - Cleo
  • many uniqueness arguments
    - Tonif
  • 45' - Needed a chain at the end
    - COM
  • Aus der Eindeutigkeit linke untere Ecke B2 gefolgert, dann trotzdem noch eine Weile gebraucht. Schöner So Morgen
    - b*k*
  • 34' with lucky guess
    - sumsum
  • 45’
    - Greg
  • 27' , one longish head HC
    - pax
  • ca. 90 minuten, letztendlich D7 glücklich geraten
    - dersoloist
  • Like jgrab
    - Neunmalneun
  • 35 min, hi/lo in col.3
    - Torsten&Irina
  • 1:03:49 nicht ganz leicht aber schön
    - zoo-pony (Tartlau)
  • The key for me was D6. Very nice
    - TriTop
  • 54 min - finding the right position of 5 in column 1, another logic one
    - Susi
  • 57 min, nach einer richtigen Entscheidung reine Logik.
    - poblid
  • 13 mins. Finally something I could solve.
    - Miss P
  • Lucky guess on H3, after I ran out of ideas.
    - jgrab