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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:Ben

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This X-str8ts only needs one clue to make it unique (C2=6). Feel free to remove the other clues if you're a masochist.

is.gd/ben_511_X

by:morl

 

For those who found last week's combined Setti puzzle too hard here is an easier one.

is.gd/morl511_1

 

by: hone

 
 
Thank you, morl. This one is indeed easier: standard tools plus oddness considerations.

 

by: pax

 
 
Hi Hone
I'm not using the oddness argument so far, solved it with head chains. Can you please (and I know it is repeated) share the oddness argument again?

 

by: Leren

Add to this thread
 
I've been working on this myself today, so here is what I've found.

Only odd sized compartments take part in this move. It's easy to see that Rows CDF start and end in odd numbers, and Row G starts and ends in even numbers, and none of their ranges is uncertain. Column 7 starts and ends in even numbers and Column 6 starts and ends in odd numbers but you know its range.

The oddness argument says that to even up the oddness balance Columns 3 and 4 must start and end in odd numbers but their range is uncertain.

So, Column 3's range could be 1 - 7 or 3 - 9. Fortunately, for me there are singletons 1 and 9 in E3, so you can eliminate 248 from there. Easy moves remove the only 1 from Column 4, whose range is then 2 - 9. Since it must start and end in odd numbers, the only solution is that it's range is 3 - 9, so you can eliminate 2 from Column 4, which solves.



by:Klaus

 

pure logic

 

by: jgrab

 
 
Whatever mental state you may have on a Sunday morning, this is certainly true.

 

by: pax

Add to this thread
 
Tried and made it WC. Only possible with pure logic.

by:Leren

 


is.gd/Leren_511_X

 

by: morl

 
 
Got it eventually, after a couple of chains. Didn't see a very smooth way here.

 

by: dennis

 
 
after 21 solved cells, i did a guess on a setti.

 

by: Christoph

 
 
aftrer solving 13 cells, I checked A1 - A6 to be 3-8 or 4-9 and was sthus able tofix A5, A1, B2, B4, C4, C2, F1, B4, B5, A5, which solved.

 

by: jgrab

 
 
Quite hard, but doable. Starting with a combined Setti, then a little HC to fix A1-D4 hi/lo, another HC cleared D6. Finally, the alternatives based on Setti 5 will both lead to the same number in F6. Took me 90 min, but heavy HC work.

 

by: TRP

Add to this thread
 
After 21 solved cells, a SI cleared C2 and a UR consideration in columns 8 and 9 got me to 27 solved cells. Then jgrab's setti 5 implication on F6 solves the rest of the puzzle.

by:Leren

 


is.gd/Leren_511

 

by: morl

Add to this thread
 
Great puzzle, setti and fish, one short chain solves E9, and then one solves C6 to finish. Thank you, Leren.

by:Leren

 


Reserved for discussion of Andrew's puzzle(s).

 

by: Andrejs

 
 
Very interesting puzzle. I use oddness strategy and conclude that in row F should be one oddness compartment and two even compartments. Also I use Setti's rule. So all my solution was based on logic. No chains or guessing needed.

 

by: BigPapi1986

 
 
Andrejs, what is the "oddness strategy" Never heard of that one and can't find any reference to it anywhere

 

by: Andrejs

Add to this thread
 
Hi, BigPapi1986.
I would like to recommend to find in weekly puzzles archive #487 October 20 - October 26. There I first learned how the oddness strategy works.
In the comment by hone @Uta 25-Okt-2019 you can find detailed explanations. This strategy is mentioned also in other comments, for example by hone @robo 20-Oct-2019. Can you find the archive mentioned above?



Article created on 27-June-2010.
This page was last modified on 16-March-2020.
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  • 20min; settis mainly
       - Hildi - 12 hours ago
  • 20' - Elimination and X-Wings
       - Mike - 15 hours ago
  • 52# hard nut but nice
       - bsz - 18 hours ago
  • 26' on second try, used the UR
       - Jan - 19 hours ago
  • 48', way more time than it felt like it should take
       - puzzled - 20 hours ago
  • 19min; E9 was my key
       - sleepy - 21 hours ago
  • 36 min
       - attila - 1 day ago
  • 13' - careful elimination (with street interaction) and setti 6 - very nice, thanks
       - Jo - 1 day ago
  • more time than I should have taken, however done it, lovely, logic and Settis
       - Emma - 1 day ago
  • nice with CE, X-wing and UR
       - Fab - 1 day ago
  • 52min; thank you, Andrew.
       - abracadabra - 1 day ago
  • 28 min on my second attempt
       - un - 1 day ago
  • a good half an hour on third try
       - emil - 1 day ago
  • 28 min - thx to hint by Korbinian Bär
       - SBear - 1 day ago
  • 17 min with one settie in E9...than it was easy
       - Volker - 1 day ago
  • 21 min with a lucky guess - or a successful chain
       - Susan - 1 day ago
  • 24 min
       - Cminor - 1 day ago
  • 50 min - mit den Gedanken wo anders gewesen
       - wjanet - 1 day ago
  • 27 min - third try, good level
       - MoSeS - 1 day ago
  • 36 min, settis and logic, difficult but doable
       - juehe - 1 day ago
  • 20' Logic and one setti for closure
       - guilhas_ms - 1 day ago
  • 25' nice
       - ThomasF - 1 day ago
  • 40', doable without guessing
       - Gregor - 1 day ago
  • Needed a hi/lo decision.But nice puzzle.
       - mparmen - 1 day ago
  • 29' - one Setti, very nice puzzle
       - carpat - 1 day ago
  • 26', including some cooking... Nice
       - Marc - 1 day ago
  • a leichts15min
       - tasko - 1 day ago
  • 22 min - logic
       - RS - 1 day ago
  • 42' - 3rd try
       - COM - 1 day ago
  • below 10 min
       - Loser - 1 day ago