Help stepmother relieve pressure and the ending

Izzy Bell and her half-brother, Chad Alva, couldn't stop arguing. Chad's mother was tired of their arguing, so she suggested they play a game of chess to relieve stress. The woman helped her two sons get the chess set and explained how to play, then she went back to the sofa to relax. Chad didn't want to play chess to make up with Izzy, so he found a better way to do it...