I used to kick her butt each time we played, so she declared we weren't going to play it anymore years ago.

Recently, she decided she needed to give her head a little more work to do, so she thought this would be a good game to pick back up. We played probably 5 games one night, and on the last one, I decided I probably wouldn't survive if she didn't win. She was getting visibly annoyed. So, I tried being subtle and avoided multiple winning moves. When she finally won, she looked at me and asked me if I let her win... I found out what a mistake that was. We haven't played since.