If chess pieces were alive, they'd be eusocial.
There are six roles: pawn, rook, bishop, knight, queen, and king.
Colonies tend to be small. They typically consist of a queen, a king, and their offspring (a bunch of pawns and assorted other pieces).
Pawns are like larvae but also workers. Depending on how they're raised, they can grow into rooks, bishops, knights, or queens. Additionally, they do jobs around the colony and outside.
Rooks and bishops are soldiers. They protect the colony.
Knights are scouts. They explore surrounding land, looking for food and such.
The queen's main job is to have kids (the pawns), but she can also attack viciously if pressed.
Kings are different. A small number of pawns are a special kind called kingpawns, which can only grow into kings. Their job is to help the queen have kids.
When kings and queens grow up, they leave the colony to find kings/queens from different colonies.
If two colonies want the same territory, they battle until one of their kings is dead. Due to the rarity of kings, the losing side will concede defeat and death. This is the game we call chess.