Unique captcha

Really unique captcha

okay cool, but what makes it so unique?

@HemaWorst It's a pawn discovered mate.

I once in a Bughouse (Siamease) Chess game played an Underpromotion to a Knight b2 - b1 Discovered Double Check ... (There was a Bishop on a1) & Mate !

@ThunderClap nice!

Great!

@MasterAalim9633 Thanks!

Welcome!