Simplify the following text for a Grade 5 native English-speaking person.
Original: Bughouse chess ( also called Exchange chess , Siamese chess , Tandem chess , Transfer chess , or simply Bughouse or Bug ) is a popular chess variant played on two chessboards by four players in teams of two .
Simplified: Bughouse chess ( also known as transfer chess or exchanged chess ) is a version of the game chess . It is played by four people in two teams .