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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:hoke

Reply to this post
is.gd/hoke_431

No Chains. Probably too easy for the usual suspects. Perhaps those should try to solve it without inserting candidates first. At least 10 fields and 4 Setti values can be solved with some thinking.

by:Stefan

 

is.gd/stefan_431

no chains, just standard tool (but maybe a lot of them...)

 

by: Ben

 
 
Stefan, Good to see a puzzle from you after quite a while.

Out of interest, when you say standard tools, do you include UR.

 

by: ghw

 
 
Thanks, Stefan for that you are not so retired like some other puzzle creators :-)

 

by: Harm

 
 
thanks Stefan, I like this kind of puzzles very much.

 

by: hp

Add to this thread
 
thank you Stefan for this great puzzle, liked it also very much.
And welcome back! hopefully for a Longer time

by:Klaus

 

nice. only two little oberservations needed:

G14 <> 9, which follows from symmetry in GH69, and
E8 <> 2, which is given by our very dear Setti

 

by: kolumbus

 
 
another approach using CE: after E89≠589, the rest is just singles and x-wings (too easy for my taste)

 

by: Martin

 
 
Hi Klaus,

Nice and quite easy puzzle, yes!

Row E opens with little bit logic and Setti on 2 as you wrote.

Rows GH (and all the puzzle) I solved “normally”– I’m eager to learn more, so would you tell more about reasoning behind the symmetry you wrote: G14 <> 9, which follows from symmetry in GH69.


 

by: Klaus

 
 
Hi Martin,

already from the very start you can see that the possible candidates for G69 and H69 are completely symmetrical. no clues given, the influence of the columns is the same on both, the restriction 1-5 from the left side of the two rows is the same.

as long as you have complete symmetry the solution of the puzzle cannot be unique. for any given solution just change G69 with H69 and you have a second solution.

and in our concrete situation the only thing that can break the symmetry is a 5 in G14. so this has to be the case.

 

by: b.eu

 
 
Hello Klaus,

long ago you mention your own written program to solve and create str8ts puzzles. May I ask which language you used?
Thanks in advance

 

by: b.eu

 
 
... mentioned ...

 

by: Klaus

 
 
Hi b.eu,

i use good old Java.

May i ask you what b.eu stands for?

 

by: b.eu

 
 
Hi Klaus,
thanks for your quick response. I choosed this nickname bescause my first one was occupied by somenone else. If you want to, you can read it as "boy" (because I am male). The other meaning is an abbreviation for bxxx.eu, which is my own domain. As you may assume, xxx are NOT the real letters :-).
Warm regards
b.eu
PS: Is your software under public domain licence? I would be interested in studying it to participate of your tremendous knowledge.

 

by: hoke

 
 
What a funny idea! I have studied many programs during my life time and in the best case found out, how they were doing what they did.

 

by: b.eu

 
 
@Klaus - do you live in Brasilia currently? Then I would like to send you an XING contact request.

 

by: Klaus

Add to this thread
 
Hi b.eu,

my software is just a little private project i started (and ended) a long time ago. no standards, no documentation, nothing anybody (including me these days) can understand.

and i do not have any special knowledge about Str8ts, surely not more than the usual suspects.

there are not too many things, basics, Settis, Wings, UR-arguments, sometimes you can combine something into a tricky argument thats nice, thats it.

and no Brazil for me, im german, i live in germany, love it.



Article created on 27-June-2010.
This page was last modified on 17-April-2011.
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  • 26 min. No settis or hints needed. Straightforward but fun.
       - mv - 1 day ago
  • because most of us dont speak chinese fluently
       - Klaus - 1 day ago
  • can anybody tell me, why the conservation is always in english?
       - Uli - 1 day ago
  • 40 long minutes because i used a number twice in one row....stupid mistake on the way to heaven, otherwise a nice puzzle
       - emil - 1 day ago
  • 35' some setti, some wing, some fish and the UR, nice
       - ThomasF - 1 day ago
  • 46 min - after I understood Klaus' explanation (thanx!), it was pretty straightforward. Nice one!
       - Drefplin - 1 day ago
  • 21' easy one this week
       - Sugar - 1 day ago
  • 32 min nice one
       - 7iron - 2 days ago
  • 25 min - took me a while to see the logic ...
       - Stef - 2 days ago
  • 14 min - very nice and not very difficult
       - Susan - 2 days ago
  • 32' easier, but I, too, had difficulties to spot the obvious
       - joeB - 2 days ago
  • 46' - I started to like sea creatures with this one :)
       - Fenatren - 2 days ago
  • 37' - hatte zuerst einige Offensichtlichkeiten übersehen.
       - Axel - 2 days ago
  • i mach des ganz ohne wings einfach so
       - tasko - 2 days ago
  • 29'; nice and smooth, logic only
       - un - 2 days ago
  • Easier one this time. Been a while.
       - Essie - 2 days ago
  • Nice one
       - mparmen - 3 days ago
  • 17 min, nice!
       - Alex - 3 days ago
  • 20 min. setti und wings
       - humpti dumpti - 3 days ago
  • 25' - nice one
       - Coco - 3 days ago
  • 25 min: settis, wings
       - JimKnopf - 3 days ago
  • about 1h. A setti, an UR (probably useless), some X-wings and CE. Noticed GH69 unicity stuff like Klaus, but wasnt sure so didnt use.
       - Fab - 3 days ago
  • 17' on second try, some wings are enough
       - Jan - 3 days ago
  • Tralllalalaalala
       - uli - 3 days ago
  • 52' very nice
       - bsz - 3 days ago
  • 36' - settis and sea food - just the way I like them :)
       - selecti - 3 days ago
  • fishing helps. a nice one on a rainy sunday. 14 min. with solver
       - Stadtlicht - 3 days ago
  • after a mistake first time rond, 13 min in sec. attempt, lots of singles, very enjoyable
       - easydoesit - 3 days ago
  • 23'. Nice!! Lots of x-wings and related figures and their triple counterparts, Always forget those names...
       - Marc - 3 days ago
  • 42 min. - with Klaus' tipp rather easy. Thanks
       - Ernie - 3 days ago