Reiner and Armin played chess in their free time.

Reiner didn't know how to play so Armin taught him.

Reiner started getting better but he was no match for Armin.

No one can beat Armin at chess. No one.

When Hanji and Armin were playing chess once Armin was almost put into a corner.

He was actually about to lose but Levi walked in and brought up a conversation about Titans and Hanji got super excited and knocked all the pieces off the board.

Armin thanked his lucky stars and never played with Hanji again.