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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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This week's puzzle is very easy. Remove the clues in A9 and F1 if you want a little more fun.

by:Santa Stefan

Reply to this post


by:Santa Klaus




by: pax

Thank you Klaus, a very interesting one, solvable with head chaines for me.


by: jgrab

Thanks, very hard for me. Even after I understood col. 6 UR avoidance which solved D56. But thereafter???


by: Berny

Have you looked at col 1, starting with D1, after that?


by: Astrid

Solvable without chains. Needed the unity rule quite a few times, i like that! thx


by: Ben

What is the unity rule?


by: Astrid

sorry, i was somehow convinced that's what the acronym "UR" stands for, but i was wrong. Of course UR means "unique rectangle" - if we assume that the solution to the puzzle is unique.


by: Jan

Add to this thread
Could someone explain the column 6 UR argument, please?

by:24:34 nice

Reply to this post
Latimer - That was an easy one! Thanks for the pleasure. Can't wait for the next one!


26' First time ever to get one of these solved! Need to train Settis more...


by: kolumbus

Hi Tom, welcome.
Setti's rule really is a powerful tool; however in this case it's not needed, the col-swordfish on ABD123 tells us that compartments B1-5 and D1-6 must contain 2, which solves the rest easily.


by: morl

however, for some people (including me) it's easier to see a Setti than a fish.


by: Andrejs

It is also my case. After CE (especially in column 7) the
Setti was my only tool.


by: Andrejs

Add to this thread
Sorry, I made a mistake: especially in column 8 (not 7).

by:Santa Stefan



X Puzzle


by: ThomasF

thanks Stefan, that was a really nice one


by: Harm

Thank you Stefan. I needed the X until the end.


by: jgrab

40 min; step by step with standard tools. Thanks!


by: hp

puh very hard, but doable without chain Need the whole Toolbox
Thank you Stefan, undoubtedly another X masterpiece


by: aw

I really appreciate being forced to do X-Versions by this Advent calendar - the frequent problem is that somewhere in between I forget about the X and worry about uniqueness :-) Really a nice and doable one - thanks for all those puzzles!


by: kolumbus

Very nice and challenging, thank you, holy Stefan!
The key for me was CE on A-D4.


by: Jonas

May someone explain to me the "X-Factor"? Is it a tool?
Thanks in advance


by: Christoph

Jonas, you have to apply for the diagonals A1-J9 and J1-A9
(this "X") the same rules
as for all the rows and columns.


by: Christoph

Excellent X-str8t, Stefan. Solvable without chaining. Thanks a lot.


by: Jonas

Got it, thx Christoph (Danke!)


by: Jan

Add to this thread
Very nice...my first stumbling block was that I only considered G7H8 as an X-compartment instead of F6G7H8! And indeed an elimination in column 4 is crucial.

Article created on 27-June-2010.
This page was last modified on 17-April-2011.
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  • My first look at Str8ts after several years. Solved surprisingly easily with only basic logic and application of Setti's rule to 6s.
       - KMK - 4 hours ago
  • 21`- with settis . A very nice puzzle
       - carpat - 5 hours ago
  • 15 min. on second try (don't know where I went astray on the first)
       - joeB - 6 hours ago
  • 7 min. Very easy.
       - morl - 7 hours ago
  • 18' - very easy this week
       - selecti - 1 day ago
  • 11'
       - humpti dumpti - 1 day ago
  • 8 min - very easy indeed
       - Susan - 1 day ago
  • 29' was not really difficult
       - juergen - 1 day ago
  • 17 min - nice!
       - Stef - 1 day ago
  • Another most enjoyable puzzle!
       - Fleurette - 1 day ago
  • easy but lovelyh! Just one Settis and .... that was it!
       - Emma - 1 day ago
  • 50' some cells were tricky ^^
       - Student-Ger - 1 day ago
  • A settis firework indeed! No wings or other "advanced" tools needed.
       - GC - 1 day ago
  • 30' - nice, without chaine, only settis and accurate elimination
       - malue74 - 1 day ago
  • 18' - quite easy, one setti
       - Michael - 1 day ago
  • Sorry, my key was accurate eliminations in column 8 (not 7).
       - Andrejs - 2 days ago
  • 46 - beautifull
       - chris - 2 days ago
  • 15:45. Settis.
       - mv - 2 days ago
  • 17 min a few settis; loved it
       - Hildi - 2 days ago
  • Accurate eliminations in column 7 was my key. Good solving thread.
       - Andrejs - 2 days ago
  • 45' one of few extremes I'm able to solve. Besides one setti more like a 4* puzzle.
       - Tom - 2 days ago
  • 26 min - nice settis
       - 7iron - 2 days ago
  • I liked it
       - val - 2 days ago
  • 31 min
       - poblid - 2 days ago
  • 18 min, very easy and snowy
       - effchen - 2 days ago
  • 40 Minuten, war gar nicht so sehr schwer
       - wjanet - 2 days ago
  • 35:24; two attempts, same solution: "Unknown Error Occurred. hmmm."
       - abracadabra - 2 days ago
  • 24' nice and easy
       - Boerny - 2 days ago
  • 10 min.
       - Katjulik - 2 days ago
  • 8m40s (no guessing) - I must have gotten lucky and progressively looked at the right part of the puzzle - the cells fell like dominoszle.
       - MrBill - 2 days ago