funny little thing i stumbled upon by accident:

trying G2=3 solves all 3's and results in a 1-cell-UR in G1. this elimination makes this one an easy Setti puzzle.

different way without chain/UR:
H1≠4 (contradiction to Setti 4) -> G1≠3 -> G2≠2 -> F2=2 (Setti 2, in any case, if G1 is 2 or not)

Hi kolumbus,

you consider "H1≠4 (contradiction to Setti 4)" as "without chain"?

by the way: H1<>4 is given by a Jellyfish

Dear kolumbus, I don't see the "contradiction to Setti 4" as both G1 and H1 can contain a 4

Sorry, now I see the fish! Thanks.

interesting discussion.
chainless way to solve might be:
4 fish 4 to eliminate the 4 in H1
3 fish 2 to eliminate the 2 in E2
BCA on 6, rest does the solver

Just also solved it with H1 can't be 4 because of setti 4 and the UR Klaus also found.
My major issue: I'm solving all puzzles on my phone (Samsung), no solver. Since today if I klick on a cell it shows me (mostly meaningless) figures as a proposal, which are hiding other fields. Very disturbing... Anybody a hint how to get rid of that?

Hi pax,

had, i think the same issue some weeks ago with Chrome on my laptop.

as some other user, forgot the name, indicated, its got to do with with AutoFill-Einstellungen. i deactivate this now while solving the puzzles and that resolves the problem.

pax,

I recommend using mastertoolworks.com/str8ts/str8ts.html. It's not a solver, but allows you to enter candidates and is able to highlight digits (by clicking column heading). You simply copy&paste the is/gd/... url - or enter no url to get the weekly extreme.

I can't remember the user that wrote it.

@Ben, Klaus
Thank you for the hint, I deactivated Autofill, all fine now!

is.gd/Leren_482_X_M

Please Help me. I am a Cookie. Whats tue meaning of you Post??

@Rost: copy is.gd/Leren_482_X_M as URL in your browser and have fun with Leren`s X straits. X means that both diagonals A1-J9 and J1-A9 follow str8ts rules as well

I failed two times, always something wrong towards the end. In find this significantly more difficult than the plain X variant below.

@ jgrab

If you can find the embedded solution you can check to see where you have gone wrong. Alternatively, if you have a blank cell towards the end I can give you its value. It's a bit early in the week to post the whole solution - don't want to publish a spoiler just yet.

It was hard work. My solution is setti-based, incl. a head chain that excludes one of the two candidates in J1.
may be that I had a lucky failure somewhere.

@ Leren: Of course, I can always inspect the solution in the resolved URL line.

@ Christoph

A standard fish solves G7 and J1 falls shortly after.

@ jgrab

Nice trick about the URL line. Looks like all my puzzles contain a spoiler :)

I have done it once more. I can confirm that I had no lucky failure. My solution is based on standard tools, except the head chain to exclude one of the two candidates in J1, as mentiond befor.
Leren, I had not sen the fish you mentioned.
Verv nice, challenging puzzle.

Not so medium for me, probably overlooked something. Got to 17 solved cells easily (including G7 and J1), but then needed two short head chains to remove 5 from H9 and 7 from J6.

@BP
At 17 solved cells you can find an x-wing (twisted), which directly solves H4 and then the rest. So far I didn't need any (head-) chains.

@Lewis: Ah, you're right, completely missed that one! Thanks for sharing it!!!

is.gd/Leren_482_X

Thank you, Leren! Develops nicely step by step

A hard one, to me there were quite big "gaps" between pets's "steps". Hard but good, thank you Leren!

Hard work, needed whole toolbox, many fishes, naked triples and a very short head chain. Thanks, Leren!

After a lot of CE finally a setti contradiction on 8 solved. Very hard work, indeed

Reserved for discussion of Andrew's puzzle

I'd like to tell how I solved this puzzle. After finding the candidates, all sure digits and preparing all Setti, I made sure I had no idea how to proceed. I rolled over and didn't check for fish patterns. I decided to use alternative solutions.
Alternative one: A8=2/3. It managed to solve some cells.
Alternative 2: Column 1 and row G contain 3 / do not contain 3. It solved the whole puzzle.
All this of course took time and patience.