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Archive
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:Leren

 
A relaxing way to end the week. Blow up Hone's tank with a cannon :)


is.gd/Leren_505_Cannon

 

by: jgrab

 
 
Nice! Develops step by step. Hi/lo decision on on F78 is quite easy, some CI, and Setti does the rest. 38 min, though.

 

by: Jan

 
 
Very nice! ...but it's simpler than that: After the high/low in column 7 and row F, there is a large wing and an x-wing, after which the puzzle collapses.

 

by: kolumbus

Add to this thread
 
common tools did it, thanks Leren

by:morl

 
is.gd/morl505

 

by: ghw

 
 
Thanks morl,

nice and relaxing with wings and small fishes.

 

by: jgrab

 
 
Thanks. Wings/fishes only, not exceeding 3x3 patterns.

 

by: Jan

 
 
Thanks! Smooth with three 3-wings on three different digits in three different corners and one x-wing in between.

 

by: BP

Add to this thread
 
Like the others, thank you, morl!

by:hone

 
is.gd/hone505_Tank

 

by: Jan

 
 
Develops very nicely with a lot of wings, a large as a starter. At 44 solved cells need a head chain to decide which of two possibilities in a column is the incorrect one.

 

by: LeFabiong

 
 
Looks more troublesome than it is. Nice practice for wings and fishes, no chains needed. Thanks!

 

by: pax

Add to this thread
 
Thank you hone, nice!
I recap not using a big fish in the beginning, but probably the same HC towards the end.

by:Leren

 


is.gd/Leren_505_X

 

by: BP

 
 
Tough, but good. Needed whole toolbox, including two very skewed xwings (aka Finned Franken (Skewed) X Wings) and one SI. Thanks, Leren!

 

by: Jan

 
 
can't see anything of that kind at 33 solved cells...

 

by: BP

 
 
@Jan: Not sure about the number of solved cells but some of our crucial steps were:
a skewed swordfish on 6,
a very skewed xwing on 9 to remove 9 from C7,
SI to remove 9 from H8 (H8=9 => ... => C7=B8=6),
a very skewed xwing to remove 8 from A5.



 

by: Jan

 
 
@BP: I believe I identified the skewed 3-wing on 6 - the \ diagonal and columns 3 and 4, correct?

But I can't see an X-cycle on 9, in particular because I still have (689) as candidates on the / diagonal and again three 9s on the other diagonal.

 

by: BP

 
 
@Jan: The skewed swordfish on 6 is correct.
The skewed xwing: We had a pair of 9's in H78 and one in CJ9. Since H8 and J9 meet on \ there is an odd cycle: C7->H7->H8->J9->C9->C7.

 

by: Jan

 
 
Thanks, BP. But those X-cycles are chains to me, and this puzzle, though solveable, is a bit too chainy for me. However, I find it amazing and surpriing that one can build such a puzzle with only three clues!

 

by: BP

 
 
@Jan: I can well understand that you consider the X-cycles chains. At first I didn't like them too much either. However, I am getting used to them and they are a really helpful tool for Leren's x-puzzles. If you are stuck just look out for pairs of the same digit, check whether two endpoints meet in the same row, column or diagonal and test whether they form a helpful odd cycle. I like that approach better than just randomly looking around for a helpful head chain.

 

by: Jan

Add to this thread
 
Yes, that I can agree with!

by:Leren

 


is.gd/Leren_505


 

by: witch

 
 
thnx - nice puzzle - no chain needed

 

by: pax

 
 
Very nice, I used a short head chain. Thank you Leren!

 

by: dennis

 
 
hard one. no chain.

 

by: bukabay

 
 
With the last 4 rows solved, I'm struggling to find a way without a chain. Any ideas?

 

by: Leren

 
 
@ bukabay

Look in the top left hand corner.

 

by: Susan

 
 
Very nice one. Just settis and CE. No chain needed.

 

by: Jan

 
 
I used a consideration based on setti 2 and the situation in row C, which solves E7 and with it the puzzle.

Can't see how Leren's hint helps...

 

by: BP

 
 
Used SI on E7 to finish. Thanks, Leren!

 

by: Leren

 
 
@ Jan

There is a head chain/SI there that solves, but it's a bit early in the week for a spoiler. Maybe later in the week if you still can't find it.

 

by: Jan

 
 
Perhaps we are talking about the same thing here...we'll see later in the week. In any case, solving E7 is the issue.

 

by: Leren

 
 
@ Jan

At 25 solved cells the SI/head chain I used was :

B4 = 5 > B1 <> 5 => A1 = 7 => A4 = 6 => B4 <> 5

 

by: Jan

 
 
Thanks, Leren, but I don't grok that. I still have (24) in DE4, so I can't follow that last conclusion of yours, A4 = 6 => B4 <> 5. What am I missing?!

 

by: Leren

 
 
At 25 solved cells I have D12 = 98 and there is then a naked pair (24) in D79. Hopefully that will help your grokking.

 

by: Jan

Add to this thread
 
Ah, thanks, can't understand how I missed that little elimination in A1 which solves D1 8-(...!

by:Leren

 

Reserved for discussion of Andrew's puzzle.

 

by: hp

 
 
Nice and tricky, perfect difficulty level for me
Thank you Andrew

 

by: Jan

 
 
Really a very nice extreme. Starts off with an x-wing, then a BCA consideration followed by a setti, some singles and finally two x-wings. Column 4 gets all the attention.

 

by: Andrejs

Add to this thread
 
I made a mistake in the first attempt. In the second attempt I tried to be very careful. In addition to the standard tools I used the analysis of possible combinations of str8ts in column 4 and row F. This made it possible to reduce the number of candidates (possible str8ts) and find all sure digits. I liked the puzzle, thank you Andrew!



Article created on 27-June-2010.
This page was last modified on 17-April-2011.
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  • I have tried this 3 times, and end up with 3 different mistakes...Maybe later
       - Marc - 5 hours ago
  • 23 min nice
       - humpti dumpti - 1 day ago
  • 35' - Cool and tricky one.
       - LK - 1 day ago
  • 30 min; no chains, no guesses, no hints
       - joeB - 1 day ago
  • 24' on 2nd attempt. Didn't see a UR on 1st try
       - guilhas_ms - 2 days ago
  • 56' - one guess needed on F5
       - selecti - 2 days ago
  • 1'27". Took too long to figure out.
       - D-Day - 3 days ago
  • 37 min wow! an x-wing festival
       - deHöner - 3 days ago
  • It took hours, but I got it through settis and one lucky guess on C3
       - Fleurette - 3 days ago
  • 15 min - took some attempts, but finally done. Nice one
       - Susan - 3 days ago
  • 2nd try 24 min
       - lonko - 3 days ago
  • Done with some settis and 2 x-wings
       - A B Traherne - 4 days ago
  • den ganzen Tag, aber mit Pausen. Ich glaube, heute habe ich X-Wings kennen gelernt
       - wjanet - 4 days ago
  • 31 min, with a lucky guess on the 4 in row F
       - Alex - 4 days ago
  • Quite relaxing, standard toolbox.
       - BP - 4 days ago
  • wow, tough one. Pure logic, no chain
       - hiitsme - 4 days ago
  • 21 min - settis and a couple of x-wings, no chains needed
       - Geoff - 4 days ago
  • Conscientous work solves! Settis and wings
       - Jan - 4 days ago
  • Done but needed a choice with further choices beneath it.
       - mparmen - 4 days ago
  • 26 min - 1st attempt didn't succeed - 2nd attempt without any problems
       - Sabine - 4 days ago
  • 48' :-(
       - martijn - 4 days ago
  • row 4 was my problem, a nice puzzle for a rainy sunday
       - poblid - 4 days ago
  • 34:90 - stay concentrated, no need to guess
       - fred - 4 days ago
  • Settis and then careful elimination with pure logic.
       - Benny_42 - 4 days ago
  • 45' , only logic. CE of col 4 is the key.
       - MrL - 4 days ago
  • 61min; nice puzzle.
       - abracadabra - 4 days ago
  • 45 min. - with a lucky guess
       - Nessie - 4 days ago
  • That was a really fun one. I love wings so for me it was one of the best in the last weeks 🙂
       - Schmidl - 4 days ago
  • 48' w/o solver, very nice
       - Hel - 4 days ago
  • 19' - settis, singles and x-wings - and I needed a small chain near the end
       - Jo - 4 days ago