How to get the killer king achievement?

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Avatar of SebastianL01
how can I get the killer king achievement? the king can't check the other king, and I can't seem to figure it out. if anyone knows how, can you guys tell me?
Avatar of futuregm7070

Discovered checkmate

Avatar of Nico8x8

@SebastianL01: see https://www.chess.com/blog/Nightwish85/killer-king

Avatar of ayaanistufff
u can get killer king by doing a discobered check with your king, that attacks the other king that leads to a checkmate