Double Discovered-Check, an unusual double check

You guys are fast! Thank you for posting those diagrams, which perfectly illustrate what I had in mind.
As far as I can tell, the double-discovered check is possible only for an en passant capture.
Anyone want to try for triple check?

Easy to show triple check is impossible in normal chess. (It's possible if you include nightriders, however.)

@deathsgambit, I forget to say ... nice mate-in-one! I don't remember ever seeing one involving this unique theme.

@deathsgambit, I forget to say ... nice mate-in-one! I don't remember ever seeing one involving this unique theme.
In the common type of double-check, a piece moves to deliver check, and simultaneously uncovers a straight-line piece (B, R, or Q) which delivers the second check, e.g.
The thread title Double Discovered-Check refers to a rare type of double-check in which a single move simultaneously uncovers not one, but two discovered-checks. Of course the piece that moves does not itself deliver check (otherwise we would have a triple-check, which is known to be impossible).
Anyone know the key idea behind this unique double-discovered check? I suspect many of you either already know the answer, or will use logic to quickly deduce the answer. I will post a diagram later to illustrate the answer.