Jean didn't cheat...ever. She was a good girl, brought up on wholesome rules and the love of two very truthful parents bent on making their daughter the same way. So far, it had worked. The redhead was kind, polite, and honest...everything her parents wanted, but unfortunately a mutant as well. While they were coping the best they could with the knowledge, Jean knew they weren't happy. They had dreams of her being a doctor, but she was daddy's worst nightmare...a freak and a hero.
So after the directions were explained in her ear, Jean started to play without her mindreading abilities. Sure she could shift through his thoughts and find what his next move was, but that was cheating and Jean didn't cheat...right? "Sounds simple enough."