Who is Sergeant from Welcome to the Monkey House and what is their importance?

Volunteers to be the king's pawn is the most dangerous position. Helps calm down the corporal. The Sergeant is the first to be killed, when Pi Ying takes the king's pawn, even though Kelly has set it up so there is no tactical advantage for him to do so. This event shakes Kelly's cool frame of mind and puts the game's reality into stark clarity.