dailysudoku.com

[JV]

When I joined a few weeks ago, I was embarrassingly crass (frustration perhaps, though that's a reason rather than an excuse). Anyway, it's been good fun catching up, doing old DAZ puzzles, etc.

Here's an oddity, a difficult looking puzzle that needs just one move.
Menneske 5816838 after a couple of straighforward moves:

[daj95376]

[JV]

Thanks: very neat! (I didn't think of using the ALS in r1, & indeed didn't notice it.)

Most of us would see this via the ALS in box1r23, because you can see without thought that r2c8 = 5 removes 2 & 5 from r2c12, & 5 from r3c23. Can one express this in Eureka? - i.e. restricting it to r23.

[Asellus]

Try this:
(5=2)r2c4 - ALS[(2)r2c1=(5)r2c12|r3c23] - (5)r1c12=(5)r1c8

[JV]

Thanks, Asellus: very neat. I didn't think of starting with r2c4, but wouldn't have had the confidence to do it anyway.