You cheat!

I've spent the day playing with Denephew. I've never understood the principle of letting a weaker opponent win, so at one point he yelled: “You have to run slower, that's what adults do when they play with children!” Bah, he fits in narrower spaces than me*, so no mercy!

*) Here's another tip: If you play hide-and-seek and you know where the kid has hidden, you don't have to immediately retrieve them if you need a breather.