The line of dialogue you're thinking of is: "Do you know what that condescending bitch said to me after our first game of chess?" It's said from the point of view of Dr. Halsey. It's a reference to Cortana's first words uttered by her after Halsey's first game of chess with her, "Quando il gioco è finito, il re e il pedone vanno nella stessa scatola." Which translates to, "When the game is over, the king and the pawn go in the same box."