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#763, February 2 - February 8:
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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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

 2-Feb-2025, 13:53
 

by: hepa

 2-Feb-2025, 13:53
 This time it worked, forget the other entry.
 

by: AndreasM

 2-Feb-2025, 20:38
 Hmm, I tried it and somehow made it, even cleanly. A rather strenuous proposition. I don't know, what to make of this experience and whether I will tackle future puzzles of this kind. But try it yourself.
 

by: hepa

 4-Feb-2025, 12:11
A few hints:
- To make the puzzle chain free remove 2 from H3 and J3 (cell forcing
chains did that in my solver)

Solution methods unique for Jigsaw puzzles
- skewed pointing pairs, triples, ...
- candidates in 1 box can remove the candidate at the crossing of
lines in another box (pointing type)
- candidates in 1 line and 2 boxes can remove the candidate in one
of the boxes (claiming type)
- skewed naked pairs, triples
- in 1 line and 2 boxes can remove the candidates in cells that one
of the boxes and a crossing line can see
- in 1 box can remove the candidates at the crossing of lines in
another box (1)
- double pointing pairs, double box/line reduction:
see www.sudokuwiki.org/Double_Pointing_Pairs
and www.sudokuwiki.org/Double_Line_Box_Reduction,
but note also larger combinations are possible depending on the
shape of the boxes.
In this puzzle my solver showed a claiming triple in columns 7,8,9
for candidate 4.
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by: triemers

 2-Feb-2025, 11:15
<72' (with lots of distractions) Nice difficulty. Thanks
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by: Benjamin

 2-Feb-2025, 09:22
How does the UR in col. 5&7 work? I need help.
 

by: hago

 2-Feb-2025, 09:38
 @Benjamin: Try what happens to 5BC and 7BC if 5FGHJ contains a 6
 

by: hoke

 2-Feb-2025, 12:22
But you need to find the big gap in E6 with CE first.
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by: acs
 The Weekly Str8ts puzzle #763
 

by: hp

 2-Feb-2025, 13:23
 very nice and tricky
shortest path i found:
xwing 8 BC57, VCE Col 5, Gap in E6, UR BC57, Setti 4, xwing 6 and xwing 9 towards the end
 

by: hp

 2-Feb-2025, 13:24
sorry correction meant: VCE Col6
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by: acs
 The Weekly Str8ts X puzzle #155
 

by: Martinus

 2-Feb-2025, 07:51
 One setti and normal x power make it collapse fast.
 

by: optimator

 2-Feb-2025, 11:56
 I couldn't quite find the path. I made a choice on E5 that solved it.
 

by: Hel

 2-Feb-2025, 12:04
 Very nice, no chain or guess needed (E5 can be solved by CE in \)
 

by: jgrab

 2-Feb-2025, 12:20
 13 min; x-power alone helps almost through the end, then one Setti needed, like Martinus says.
 

by: kris

 2-Feb-2025, 13:30
 even Setti is not needed, only CE and x-power, easiest x-puzzle since months
 

by: optimator

 3-Feb-2025, 12:29
I tried again and found the CE in the upper left corner to determine E5. Thanks, Hel.
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by: acs
 The Weekly Str8ts B puzzle #155
 

by: AndreasM

 2-Feb-2025, 08:24
 For a change, a B-puzzle which is fairly easy to solve.
 

by: Martinus

 2-Feb-2025, 09:20
 Some URs were the key. Thanks!
 

by: Cosmanita

2-Feb-2025, 09:26
 Very nice puzzle, I started in box 3 and only used standard tools.
 

by: Susan

 2-Feb-2025, 16:06
 Nice one, thank you
 

by: tg

 2-Feb-2025, 20:00
 Thank you, chainfree fun.
 

by: optimator

 3-Feb-2025, 12:03
 a quick one
 

by: kmr

 3-Feb-2025, 18:21
Standard tools, great puzzle. But for me not that easy.
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by: acs
 The Weekly Str8ts BX puzzle #155
 

by: witch

 2-Feb-2025, 09:30
 very nice one - at the end I needed a chain
 

by: Ollie

 2-Feb-2025, 10:46
 Pure logic ans standard tools, just right for me!
 

by: Susan

 2-Feb-2025, 16:33
 Needed a chain as well, but very enjoyable
 

by: tg

 2-Feb-2025, 19:59
 At the end I needed a short chain. - Thank you!
 

by: optimator

 3-Feb-2025, 12:23
I also needed a chain at the very end
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Page created on 27-June-2010.
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  • 75 min, no chain, no guess needed
    - o
  • 1h, several chains needed
    - A B Traherne
  • 1.5 h
    - Julioflor
  • with h/l-guess
    - chris I
  • 42 min, 3. Versuch
    - Rot
  • 46' whith several guessings
    - Ske
  • 1:32:22 sehr schwer "right decision" == Versuch!
    - zoo-pony
  • 20 min after right decision in D5 / A7
    - EC
  • 90min, in col8 die Ziffer 1 glücklich geraten, settis kaum brauchbar. Danke, schönes Rätsel.
    - S. Walt
  • 50', head chains, fishes
    - pax
  • 50', head chains, fishes
    - pax
  • around an hour. Gradually teased apart without guesses
    - puzzled
  • Very interesting str8t, which is solvable with Wings. Needed one UR.
    - Jens
  • 45 relaxing minutes, thank you :)
    - Silke
  • 41' with one bad guess
    - Richard
  • F8 glücklich entschieden
    - b*k*
  • 48 min
    - humpti dumpti
  • 36min
    - Essie
  • THX for the set
    - Loser
  • 28' very careful elimination
    - Maven
  • 57'
    - chris
  • 38 min. very difficult for me, wings and fishes
    - juehe
  • 44 min, genau der richtige schwierigkeitsgrad für mich
    - dersoloist
  • 38 min; a bit too long for the obvious possibilities (if you see them).
    - jgrab
  • 37' - second try - only with the hint on checking the options for 6
    - COM
  • 14' wing, swordfish, UR, wing
    - optimator
  • 96 min, thanks to Torsten&Irina
    - epibrator
  • <72' (with lots of distractions) Nice difficulty. Thanks
    - triemers
  • 2 h with HI/LO in col. 6 and BCA. For me not that easy.
    - E.H.
  • CA of col6, gap, UR and X-w's, not so easy.
    - MrL
  • 20 min. with a high/low decision in col. 6
    - flowerwaffle
  • 68 min Thanks for this
    - Marit
  • 8 min with a guess
    - Nessi
  • 30 min, mit UR in col 5&7
    - Torsten&Irina
  • 10' with some automated help. A bit of everything: Some se animals, settis CE, and UR at the end. Nice one :-)
    - MartinL
  • One UR is sufficient
    - JF
  • 25 min - logical beginning, then decision if 1 in column 8 is in row G or H. Then logical ending. GREAT!
    - Susi
  • 1h13' Took me two guesses. Bad!
    - Manfred
  • Fun is back.
    - Aubinger