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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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by:Santa Stefan

 

is.gd/2017_12_days_left_str8t


 

by: ghw

 
 
Thank you, Santa Stefan!
Beside standard tools one SI/head chain (over 4 cells) needed.

 

by: Stefan

 
 
@ghw SI/chain? Where? Row E and J?

It's hard work and sometimes not easy to see, but you can solve it without any SI or chain.


 

by: jgrab

 
 
Thank you! After singles and fishes, after 16 solved cells no other idea than a chain.

 

by: PAX

 
 
Thanks a lot, Stefan. Same as ghw, one head chain to exclude a number.

 

by: Berny

 
 
Thanks, Stefan!

I have to agree to you: Singles, two hidden pairs, one x-wing, two 3-wings, one 4-wing, 2 settis and CE, resulting in a large gap.

But NO chain! (Probably the CE I mentioned is what PAX means with "head chain to exlude a number". But everything happens in ONE row...)

 

by: Carol

 
 
You don't even need that CE, but a hidden pair is quite crucial.

Thank you very much to all the str8ts creators!

 

by: ghw

 
 
Stefan,
may be, but I could it not solve without SI or head chain!

 

by: ghw

Add to this thread
 
Oooops, mistake in grammar, but you will understand.

by:Arjan

Reply to this post
12' guess on A9. Got error message but everything is ok. Another choice on A9 cannot work.

by:Santa Klaus

 

is.gd/2017_13_days_left_str8t

 

by: jgrab

 
 
Thank you, Santa! Again, a nice practice time while waiting for X-mas. CE, SI/little head chains, and Settis.

 

by: PAX

Add to this thread
 
Thank you Klaus, solvable with more than one head chain, challenging without aids like pen/paper etc.

by:hone

 
Advent 2017 chainless Bigwings #2

is.gd/hone390_Meander

 

by: morl

Add to this thread
 
Thank you for this excellent puzzle! A lot of settis and fishes.

by:morl

 
is.gd/390_morl_symmetric

 

by: ghw

 
 
Thanks for this nice puzzle!
X-wing and fishes in different sizes.

 

by: jgrab

 
 
Thanks, nice exercise in basic tools.

 

by: Carol

 
 
After basics and and xwing on 2 I'm stuck at 13 solved cells and can't detect any fish nor other basic. What do I miss? A test on A5 leads to a Setti contradiction and solves quickly, but I think that's not what you are talking about?

 

by: hone

Add to this thread
 
@Carol: After 13 solved cells chaining is inevitable.

by:jgrab

 
I think today's extreme works without a chain, or guess. After Setti 2, whether or not col. 5 contains 8, F9 must be 8 if F5-9=high (Setti 8 consideration). But check for the 9 in col. 2.
Hope that is cryptic enough to avoid spoiling.

 

by: jgrab

 
 
While I composed my post, kolumbus called the same idea a "2-options-x-wing", which sounds much more elegant for the given situation.

 

by: Klaus

 
 
Hi jgrab,

at least its cryptic enough to avoid understanding ;).

i think the distribution of the 9's offers plenty of possibilities to attack.

 

by: Tati

 
 
@ jgrab: It also works as a "2-options-bca" on 9...

 

by: ThomasF

 
 
thanks jgrab, with you hint solved without guessing or chaining.

 

by: kmr

 
 
Quite demanding even with jgrab's hint. Thank you for this, it was cryptic enough.

 

by: JAn

 
 
Sorry, I don't grok your hint, jgrab. I do understand kolumbus's conditional x-wing, which removes a candidate from two cells in column 8...but that still leaves two of those in the column.

 

by: jgrab

 
 
@Jan: C78 is 78. According to Setti 8, either B78 or C78 must contain 8. Thus x-wing for cols. 7 and 8. After Setti 2, F23=34 or 89. If F5-9 were high, not enough cells for 8 AND 9. So F23=89, A3=2 etc.
In kolumbus' terms, the wing removes more than you assumed.

 

by: Jan

Add to this thread
 
jgrab - understood!

I was looking at a different conditional x-wing - you can play the same game in columns 2,3 and 9 with regard to 9, but that doesn't get you across the top.

by:Santa Stefan

 

is.gd/2017_14_days_left_str8t


 

by: morl

 
 
Thank you! Nice one; setti combination, wings, fishes and URs.

 

by: PAX

 
 
Thank you Stefan, a very nice one!

 

by: jgrab

Add to this thread
 
Thanks, Santa! Careful fishsoup, with UR inlays.



Article created on 27-June-2010.
This page was last modified on 17-April-2011.
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  • 84' after losing my nerves and guessing A3. I must have missed something this week.
       - selecti - 1 day ago
  • Solution works, but isn't accepted. Is there a way, to make this program accept every possible solution?
       - Krs - 1 day ago
  • 28min same here
       - hildi - 1 day ago
  • 39" enjoyable
       - Maven - 1 day ago
  • 40 min - I also got "Oops! There are cells which are wrong.25" at the end, but everything is correct.
       - Michael - 1 day ago
  • 43 min., very nice one (oops, too)
       - Boerny - 1 day ago
  • I got an error message at the end, but everzthing seemed correct.
       - innsteg - 2 days ago
  • 38 min
       - Sugar - 2 days ago
  • 67 min but also got an error massage
       - schaaf - 2 days ago
  • Got an oops, too
       - hopplahierkommich - 2 days ago
  • A nice one. Error message is wrong. And also today - there is only one Solution.
       - Sabine - 2 days ago
  • same thing with me: error message, but everything is definitely right ...
       - Jury - 2 days ago
  • 80min, seem to have tomatoes on my eyes - still get an error .25
       - COM - 2 days ago
  • today there are some solutions possible. Its the combination of 8, 9 and 3, 4, 5
       - ursa - 2 days ago
  • Solved.
       - TOM - 2 days ago
  • 25 min on second attempt; also got error message in error
       - Ollie - 2 days ago
  • 30 min, got error message again. Checked solution, there is nothing wrong.
       - morl - 2 days ago
  • 10 '; hi/lo decision
       - Candiru - 2 days ago
  • very nice one, for me the key was a 2-options-x-wing
       - kolumbus - 2 days ago
  • 54 min; fishes and a little Setti-based head chain. Meassage is wrong.
       - jgrab - 2 days ago
  • Also get an error message but solution seems ok. Nedded a guess om A3 A)
       - ThomasF - 2 days ago
  • 18' without congrats, hmm, checked five times, everything is all right
       - hrw - 2 days ago
  • 18 min - high/low decision
       - ghw - 2 days ago
  • done, without a message
       - Loser - 2 days ago
  • I also got an error message at the end though my solution seems ok.One chain needed.
       - mparmen - 2 days ago
  • ive got an error message, but all seems right, some settis no chains
       - gandalf_69 - 2 days ago
  • 1:15 h - couldn't find a way without guessing or a very long chain
       - onnola - 2 days ago
  • 45 min, needed one chain to decide on the naked pair A3/A9. Nice one!
       - Rafael - 2 days ago
  • 28 min. clm 3 was my key
       - Stadtlicht - 2 days ago
  • 37 min
       - Kurt - 2 days ago