Checkmate would be irreversible."
Money Heist Season 1, Episode 8
to avoid CHECKMATE, and then he did it."
Money Heist Season 1, Episode 7
I believe that is
flag to crotch four, CHECKMATE.
The Big Bang Theory Season 10, Episode 10
Checkmate on Sheldon.
The Big Bang Theory Season 4, Episode 22
Checkmate.
The Big Bang Theory Season 12, Episode 17