
Who is really terrible at CHESS.
The Big Bang Theory Season 11, Episode 15

...if I could add a third
new CHESS piece.
The Big Bang Theory Season 4, Episode 22

I have invented
a new CHESS variant
The Big Bang Theory Season 12, Episode 17

In 4-D CHESS...
No.
The Big Bang Theory Season 7, Episode 1

Obviously, you're not well suited
for three-dimensional CHESS.
The Big Bang Theory Season 1, Episode 11