Game Theory 101: Explaining the Mahjong showdown in ‘Crazy Rich Asians’

Rachel Chu, Eleanor Young, and two other players sit down at a table to play Mahjong, a game involving 136 ceramic different tiles of varying suits. They roll the dice, deal out the tiles, and begin the game.

With 13 tiles propped in front of her, Rachel picks up a 14th tile…and pauses. She stares at it, caresses it, contemplates her decision…