How to easily get the hidden achievement "Killer King"

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DemonicArchangel

The award needs to checkmate by moving the king, which is obtained through a discovered check. Here's a simple way to get it.

You want and endgame with 2 rooks (it's the simplest way and doesn't stalemate)

and form this

So? How do you get here? simple! 
and that's it, you've gotten one of the more difficult achievements on chess.com!

Very_sad_saderfew_SHB_M

Ok

keshavasr

tanks

Fetoxo
It's easy it can also be done with queens, i did it several times
Mid-KnightRider

I reckon it can't be that hard.