So I know nothing about chess but I saw this on Wikipedia "A queen sacrifice is the deliberate sacrifice of a queen in order to gain a more favorable tactical position." and it made me think of Stiles as the queen also telling them that if they have to sacrifice him it's OK. That stopping him was the most important thing. It just felt very Stiles to me. (And very heartbreaking!)
Ooh! Nice! I mean, yes, heartbreaking, but a great parallel.