[Cullen isn't entirely startled at the man's approach--he's aware enough to keep tabs on the people moving around him even as he's playing, and playing chess against himself isn't nearly so engrossing as playing against someone else. (Particularly when that someone is a cheating spymaster or a cocky Tevinter mage.) He looks up at the man's approach....

...and up....

Sweet Andraste, if he didn't know any better he'd swear he was looking at a Qunari. Maybe a hornless, red-headed Qunari?

The only outward sign of his surprise is a little lift of his eyebrows though, and immediately after he offers a small smile and gestures to the opposite chair with a gloved hand.]

By all means, please do. A proper game would be a welcome change. I'm on my third game against myself and I keep winning.

[There's a very slight smirk.]