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Extra Puzzle Series
For those of us in self-isolation or quarantine with too much time on their hands, I have expanded the Str8ts puzzles to a new 'every two-days' series. Check out the new player. Stay well.
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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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Latest threads are now at the top.
In addition, 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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by:ralph maier

 
HI KST. I have actually started on the BX puzzle saved it jut icannot get back to the site , all sites is gd etc are not functioning, CAN YOU DO SOMETHING TO MAKE THE SITES WORK

 

by: Loser

 
 
kst or any other riddle-maker, can do nothing, if the is.gd-service is down.
If you type in is.gd you will get nothing.

You should see:

a field where you can paste your url
-Button



 

by: ralph maier

Add to this thread
 
TY JOSER for yourinformation>i know already how to protect myself against this happenin again .

by:Jens

 
Discussion of Andrew's Extreme Str8ts Puzzle, Weekly Edition #591, Oct 17 - Oct 23

 

by: Jens

 
 
@Dieter
I think todays Symmetrical Str8ts #4717 is not harder than Extremes #591.

 

by: ralph maier

 
 
itwas way to easy Onkel Otto found a 5 single I did a setti on5 tosolveit With solvers help took me about 2 min

 

by: Onkel Otto

 
 
@ralph: no, I found a single 8

 

by: ralph maier

 
 
i solved the todays 4 star out of curiosity . thekey was in column 5 the placement of 3 in thecolumn . placing the 3 in J6 a super short chain shows that itis impossible the resr was easy . i have started on 591 not finished yet

 

by: Andrejs

Add to this thread
 
I use Setti on 2, 5, 8 and UR. Setti is a undeniably logical and very powerful tool.

by:kst

 
is.gd/kst_591_BX

 

by: effchen

 
 
seems tricky in the beginning, but it is chainless solvable and very smart. Thank you for the bx...i like it the most

 

by: tg

 
 
Not easy, but chainfree. I needed a second attempt. A lot of CE and wings.- That's how I kike it. Thank you.

 

by: tg

 
 
Sorry, this comment was meant for the X-Puzzel

 

by: kmr

 
 
Tricky in the beginning, very suitable comment. Needed a head chain. But very very nice.

 

by: Janostar

 
 
Could I please have some Support/help? I got stuck a Couple of times at the decision, which Numbers are „hidden“ in the Black fields . Via trial and error I found a Solution at the end. However I am a Bit surprised. In this the Solution The block at the bottom right is omitting Not the same number as the Volumen 8 does. Same as block top left an column 2.
Where do I have my misunderstanding?

 

by: Janostar

 
 
Typo: „column“ instead of „Volumen“

 

by: Toni

 
 
@Janostar. Firstly you need to investigate block a-c/7-9 From that one and the x rule you can see that a89 must be high. Then secondly the most important step is an SI: from a combination of setti (2 must not be missing), and col 2 and 8 you can deduce that if hj8 would be high (i.e. 8/9) then a2 and a8 would both have to be 7 which is impossible. With that you know that hj8 is low. from there the puzzle is very str8t forward. Hope that helps.

 

by: @Janostar

 
 
And to answer your original question. Yes, you are correct when you say "In this the Solution the block at the bottom right is omitting not the same number as col 8 does". Why should this be true always? The only thing you know is that the numbers that are missing in the two blocks (lower and upper right) must be missing in cols 7 and 8. But you can never tell in general that col 8 must be be missing the same number as the lower right block only because this black cell in the lower right block IS in col 8. So, your "trial and error" solution is probably correct. Though, as explained in the comment above. trial and error is not really needed.


 

by: kozibrada

 
 
The same is true for both A7 and J3. In general, a black cell is not the equivalent of an unknown (unique) number, but simply an empty space that may or may not affect / define adjacent units (and logically, on the contrary, it cannot even be determined by those units, as it could take on more values, or none at all :-)).
Here, for clarity after solving, e.g. the cell G8: row G and box 9 are without this high number, which, however, does not exclude its occurrence above in column 8; however, what must be true is that the missing values in boxes 3, 6 and 9 must be the same as in columns 7, 8 and 9; and the same, of course, applies to whole Str8ts (like works Setti)…

 

by: Janostar

 
 
@kozibrada @toni
Thanks for your explanation. This makes ist easier

 

by: ralph maier

 
 
iwas going to start onthis puzzle but it says the site cannot be reached the same for the X puzzle site cannot be reached .

 

by: TRP

 
 
@toni
At 4:211:26 (maybe the clock needs a bit of maintenance) I'm still not able to find any reason why hj8 cannot be high. What do I miss?

 

by: Toni

 
 
@TRP: If hj8 would be 89 then you immediately get a8=7, b8=6 and c7 =9 (upper left block!). Since 2 must not be missing (setti!) c1 must be 2. Therefore ab2 must be 789 which is a contradiction to a8=7.

 

by: TRP

Add to this thread
 
@toni
10 minutes after my post, I found this contradiction. Sometimes writing it down helps ... Anyway, thank you for your quick answer.

by:kst

 
is.gd/kst_591_B

 

by: Toni

 
 
Since no one wanted to comment here so far, let's give it a try:) this time the b puzzle felt a bit familiar. But i won't look, if it was exactly the same before. anyhow, thank you, kst, once more for all the chainless extra fun. Almost a bit too easy this week for my taste:)

 

by: BP

 
 
A real beauty, thank you very much, kst!
(Thank you also for all the extra fun last week.)

 

by: Susan

 
 
Solving step by step, very nice

 

by: witch

 
 
very nice

 

by: Hel

 
 
Indeed very nice

 

by: ralph maier

Add to this thread
 
it solves without chains only settis and eliminations in cages. i had to doit 6 times toget it right cause of slopy logic and eliminations

by:kst

 
is.gd/kst_591_X

 

by: kris

 
 
After a micro-SI to start with, it runs surprisingly smoothly, given so few clues. Fine puzzle, thanks kst!

 

by: jgrab

 
 
21 min; x-wings, one Setti to the end.

 

by: ralph maier

 
 
Hi Kris Can you Explain tome what SI stands for ???

 

by: jgrab

 
 
SI = street interaction. In this case, if A1=7, no 7 left for ABC4.

 

by: ralph maier

 
 
TY GRAB. Ihave beenaway long time at least 5 years so iam weak on terminology . Ihave also seen CE and i think CI have no idea what they mean

 

by: Neunmalneun

 
 
CE means careful elimination. In my view this and SI are just polite euphemisms for trial and error.

 

by: Klaus

 
 
No Neunmalneun,

i heavily disagree, at least with CE.
for example in rows/columns with three compartments there are often conclusions based on value sets of the compartments without trying one single concrete possibility.

or as Bob Dylan would say "how many str8ts can one man solve...".

see you

 

by: kris

 
 
@Neunmalneun and ralph: CE and SI both have nothing to do with trial and error.
CE is used here as an overall term for non-obvious logical steps within one row or column. The famous SlowThinker named the techniques e.g. "Stranded Digits", "Cross-compartment Locked Set", "Cross-compartment Hidden Set", "Locked Compartments".
SI means 2-dimensional logical dependencies, i.e. small chains that can usually be done in mind, which are not covered by named techniques like "wings" or "Setti's rule".

 

by: Neunmalneun

 
 
@ klaus and kris:

Whether one speaks of trial and error or a technique is certainly a matter of definition. It can't matter whether you can follow a chain in your head or you need a pencil to do it. Even very short chains are chains.

Or as Neil Young would say "keeping solvin' in a free world".

 

by: kris

 
 
@Neunmalneun: Of course you can call eyery logical step a chain.
However in this forum the common use of terms is another one.
Anyway, I think experience makes the difference: An experienced str8ts solver will see the logical dependencies without having to "try" (and maybe to err).

 

by: ralph maier

Add to this thread
 
Thank you Neunmalneum Klaus and Kris for your explanations. My bottom line is i did not know the terms but the techniques ihave been using for ages,.

by:kst

 
is.gd/kst_591

 

by: Susan

 
 
very str8tforward and very nice

 

by: jgrab

 
 
Smooth development; thanks.

 

by: ralph maier

 
 
HI ALL . i need some help. ihave tried it 4 times and 4times i ended up with the same Ur . obviously iam making some mistake in my eliminations. so my question is 4 5 and6 should be inall columns and row ?? if yes iam doing something wrong lateron .

 

by: ralph maier

 
 
The good news I did solveit . The reason it took me so long was that iwas eliminating things ishould not have But it is done

 

by: barbara

 
 
like Susan

 

by: Hel

Add to this thread
 
Settis and wings, very nice

by:Dieter

 
Isn't there something wrong when the 4star is much harder?

 

by: ralph maier

 
 
Dear DIETER. Could please give an example when this has happened?? In which week, personnaly the 4 stars are much much easier than the puzzles posted by kst

 

by: tg

 
 
Thank you that we get all these wonderful puzzels for free...

 

by: Onkel Otto

 
 
@ralph: Today.
Beyond the solver's skills, the weekly extreme just needs one single.
The daily needs CE, Setti, x-wing.
Dieter doesn't refer to kst's puzzles.

 

by: ralph maier

 
 
COMPRENDO!!!

 

by: Klaus

 
 

i never witnessed a case where a daily needed more than basics, aka no Setti, no fish.

this also holds for todays daily.

 

by: hp

 
 
Both puzzles require exactly one single to solve, in addition to the solver.
In this respect, both are good exercises for WC.
In fact, I also found the Daily harder to solve than the Weekly, at least I found it much more tricky (convoluted)

 

by: Onkel Otto

 
 
Klaus, you are right, I overlooked the single

 

by: Klaus

 
 

in my experience what i find hard with easy puzzles is often luckbased.

if i look in the right moment with the right thought at the right place, it all falls smoothly into place, easy.
if i do for some reason not, which happens, it seems very hard.

today i too found the daily harder than the extreme.

 

by: ralph maier

 
 
I agree the daily was much harder thanthe extreme

 

by: ralph maier

 
 
HI KLAUS. inspired by what you said i redid the daily 4 star . What you said is verytrue , No chains needed . finding singles for ex 7 3 solved it. Sometimes we just not see the obvious so we hink itishard but anyhow yhe daily was harder than the weekly . But to me 591 seems harder than the daily ob viusly iam doing something wrong in eliminations

 

by: ralph maier

 
 
i did finish 591 . Here you had to use settis a lot so iwould rate 491 a bit harder than the 4 star.

 

by: Ben

Add to this thread
 
I always do the 4 stars WC. In today's, I utilized an x-wing, which I think made it easier than not using any wing.



Article created on 27-June-2010.
This page was last modified on 16-March-2020.
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  • Actually really straightforward got it in 7:37 :)
       - JFerb - 1 day ago
  • 18´
       - ihgs - 1 day ago
  • 10 min - kinda straightforward, perfect for a lunchbreak
       - M-Michael - 1 day ago
  • 14:52 - nice, fast, a good night str8ts!
       - Latimer - 1 day ago
  • 20 min; good fun
       - 7iron - 2 days ago
  • I also missed the stuff in the bottom right, but finally got it.
       - GC - 2 days ago
  • 23 min
       - hopplahierkommich - 2 days ago
  • easy
       - chris - 3 days ago
  • Sehr schön.....genau das richtige zum Feierabend.....danke
       - Angelo74 - 3 days ago
  • 17‘ A simple one!
       - Spinner - 3 days ago
  • senza strumenti, solo mente logico, 15' orgoglioso!
       - flowermount - 3 days ago
  • 10 min, straight forward
       - EC - 3 days ago
  • Done 🤭
       - Kmk - 3 days ago
  • 20 min on about the 5th try. Kept messing up bottom right column.
       - GiddyG - 3 days ago
  • 39 min. like it
       - Marit - 3 days ago
  • 16'easy
       - Stephan - 3 days ago
  • 10' one setti, than just fill in
       - yaya - 3 days ago
  • 9'30'' - Relaxing.
       - Mike - 3 days ago
  • 20'
       - Giorgio - 3 days ago
  • 5'12''
       - martijn - 3 days ago
  • 12' - pretty straight forward with one or two settis
       - Earnie - 3 days ago
  • 18' - simple elimination, nice! For me a 4* puzzle
       - Carpat - 3 days ago
  • 14 min, simple logic
       - joeB - 3 days ago
  • 12 min.
       - Kid - 3 days ago
  • 21 mins Very relaxing! thanks
       - CC - 3 days ago
  • 12' - simple this week
       - selecti - 3 days ago
  • 21 minutes. One UR and one Setti.
       - Twirdman - 3 days ago
  • 9 min. - just elimination
       - tbr - 4 days ago
  • one UR!
       - AB Traherne - 4 days ago
  • 14' One Setti and done.
       - Aubinger - 4 days ago