is.gd/2017_11_days_left_str8t

Harder than it first looked. CE and SI, then I chained a lot. At the end there were some non-chain arguments (settis, UR).
The lower right corner can be fixed by unicity, but without consequence on the rest of the puzzle ; there is maybe something more to be done there.

@Fab, Lower right corner is the key. To fix it you have to assume that the other eleminated digits have to come from the related rows or columns above. For example when you fix J8 to 1, the column has to have a 2. That solved it for me.

@Bansasaab: by UR considerations I have J9=2 and J8=1, but that does not mean, 2 is mandatory in 8; EFG 8 must contain 3, but not (yet) 2.
Nice str8ts on a windy day, thanks Klaus!

is.gd/Elf_494_Star_X

Nice and challenging. Whole toolbox needed. I used two short chains to decide number 3 and to finish.

Nice one. With the toolbox and skewed fishes / single digit reasoning, I could solve for all the low digits 1-4 (except C4). For the high digits 5-9, progress can be made with fishes and skewed fishes, and a reasoning on the unicity of C4, but in the end I had to use small head chains to unlock (with easy fishes afterwards).

is.gd/Elf_494_Sleigh

THX

thanks Elf, some wings did it for me

yes, 4 x-wings – that's all

Wing-based indeed.

Thank you, Elf! Though there is no snow in my area, I really enjoyed your sleigh!

Pleasant little puzzle! There are also some nice settis to work on row H.

Indeed, CEs, a nice sleigh of X-wings, and some settis for row H

is.gd/2015_2_sundays_left_str8t

Thank You Klaus for the nice puzzle!
At 17 solved cells I needed a head chain.

thanks Santa Klaus, very nice puzzle, also needed a small head chain

many thanks@Santa Klaus
really nice one, with a short head chain to decide F1

Very nice indeed, cheers Klaus! Managed to solve w/o a chain, there's a very sneaky 4-fish.

Thanks, Santa Klaus! A good challenge.

@milkyjoe: You are right, I overlooked the jellyfish, no chain needed, thanks for the hint

Thanks, Klaus.
I had used an x-wing and a setti 7 argument.

Nice. CE, UR and wings up to 3-. I was too lazy to look for a 4-wing so used a SI on columns 1&2.

Yes, that 4-wing really is sneaky!

Christoph, I can't see how a setti 7 argument could work - at least not in the position with 17 cells solved.

15 minutes....fun

Very funny thanks

Not an extreme one. No advanced techniques required, just simple elimination and singles 8-|

It seems to me that this puzzle was good for resting after the difficult puzzles of recent weeks.

Yes, Andrew's solver manages to solve this by itself when one helps it to discover the two singles it can't find due to a bug.