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