[@Randomguy]
It's player to player, there's no bot. It's basically playing the game in person at a table, you have to manually do everything the cards say. But, once you're used to it, it works well, and it allows custom cards to be made/used. So it would work best by having us play the duel out between the RPers and put the dialogue/etc. in the log as we do. Then it's just a matter of prettying it up and adding things that would be known to the reader but not the other player (ie thinking "Oh, thank goodness, I drew Pot of Desires right when I needed to. Good thing my opponent doesn't know that") since putting that in the log would obviously be telling the other player what happened. 

The biggest downside, if you consider it one, is that you do need to make an account for the site, but it's super easy to do so. Then just make a private duel with a password and you can duel a specific person by giving them that password and having them put it in at the duel table you make.

But, uh... It's probably a good idea to ignore the front page messages/statuses. Back when I was on Duelingbook much more often, there were times things there got sort of stupid.