One could learn a lot about a person from the way they played a game of chess. If they were cautious and took their time making several small moves, then they were generally afraid of risk and were unlikely to gamble in their life as well. If they took bold moves but took their time doing so – like herself and Draco – then they were likely using smoke and mirrors to shield their true motivations. If they were bold but jumped to make the first maneuver that came to mind, no matter how detrimental such a move might be several steps later, then they were generally headstrong and idiotically brave.