Help stepmother relieve pressure and ending

Izzy Bell and her younger half-brother, Chad Alva, can't stop arguing. Chad's mother was tired of the two of them arguing, so she suggested that they both play a game of chess to relieve stress. The woman helped her two children take out the chess set and briefly explained how to play, then she went back to the sofa to relax. Chad doesn't want to play chess to reconcile with Izzy, he finds a better way to do it...