Tough Sudoku for 3/May/2020

Basics to 30
1. (3=914)e379 - (4=8)f9 - d7 = d1 - (8=3)i1 => -3e1 ; UP = 81

@sotir,
I posted a comment on your post for the April 30 tough.

The photo almost looks like a diorama. Give you an idea of the scale.

Another way:
1. (8=79)d15 - (9)f45 = (69)f12 => -8f12 ; UP = 81

correction:
1. (8=79)d15 - (9)f45 = (69)f12 => -8f23 ; UP = 81

This time for sure:
1. (8=79)d15 - (9)f45 = (69)f23 => -8f23 ; UP = 81

Basics to 30
1. if h3=3 =>e3=9 f23=68 f45=39 =>d1=d5=7 =>h3=1 solve

Hi rwm. Should your first term read: (3=9146)e3789....?
Best Regards, Alfred.

11:27

Kate. Good name for this one!

Alfred,
It would be possible to begin a chain as you suggest, but in this case there's no need or value in getting cell e8 and its candidate '6' involved. I just want enough to continue the chain with
. . . - (4=8)f9 - d7 = . . .
Perhaps it would be clearer if I expanded the first term cell by cell:
(3=9)e3 - (9=1)e7 - (1=4)e9 - (4=8)f9 - . . .

Basics to 30
1. (8=739)d1.e13-e7=(9)d7 =>-8d7; singles to 81
or more 'symmetric'
1. (8=739)d1.e13-(9=148)e79.f9 =>-8d7, -8f23; singles to 81

Thanks Cenoman. My mistake really. I forgot that 6 is locked at f23. I had 369 @ e3, instead of 39. In any case, your second way is certainly the shortest.

So, similar to your second way:
Whether e3=3=i1;OR e3=9=d7;d1=8.UP81.

Kate, where is the Devils coach house? It is enormous?

OK. I have done a bit of research. The Devils coach house is part of the Jenolan Caves system, west of Sydney -south of Lithgow.

This is a great panorama that you can take a virtual look.

https://www.360cities.net/image/devils-coach-house-jenolan-caves

Tough Sudoku 30 April 2020
3 step solution