Double Discovered-Check, an unusual double check

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TurboFish

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.

deathsgambit
Edit: AzraelA, you beat me to it!
TurboFish

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?

chaotic_iak

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

deathsgambit

In at least normal chess, it is impossible to triple check.

captnding123

ONLY WITH LIBERTY MUTUAL

TurboFish

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

deathsgambit
TurboFish wrote:

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

@TurboFish
Thank you! I made the following along the same lines. Its not the toughest puzzle. Whichever side has the chance to play wins.
 
 
But if black gets a chance to play...
 
 
 
honorofking

hi

 

bollingerr

I like it

maxBestKorea

my goofy ahh couldnt figure out white to play because i still dont intuitively grasp en passant  or pawns entirely

axoturtle
Would pC5 for black and en passant (pC6) for white be the fabled double discovered check?
Arisktotle
axoturtle wrote:
Would pC5 for black and en passant (pC6) for white be the fabled double discovered check?

As you can see in post#2.

More interesting is the following evergreen challenge:

The white king was accidently swept off the board. Can you replace it on the square it came from?