2 edits
-Removed-When a member creates a new game they can create an open invite, or they can challenge a specific member. A third option is to send a challenge to a person who is not yet a member of RHP. To do that they put the persons email address in the place for their name and the challenge is sent to that person. The game will appear as it does now until the challenged person responds and opens an RHP account, at which time their new username will appear.
I have not ever used this feature so please understand that my answer here is just a guess. Others can probably confirm this or offer a better explanation. :-)
<edit> After looking closer, it appears that you played this person a 'welcome' game over a year ago and on the same day he started this game as well. He then resigned in your game before you made a move and did nothing with this one.