Hi - I just wanted to offer a couple of words of advice, as a computer game developer. (I'm not offering to take on this project as unfortunately I don't have the time.) Firstly, unless money is no object to you, get a quote for the total price of the project, payable on completion. I wouldn't agree to pay somebody an hourly rate, especially if the developer cannot tell you precisely how long it's going to take. Secondly, I would strongly recommend only hiring somebody who has previous experience of making an online multiplayer game. There is a massive difference between making an online game, and making an online multiplayer game, and without wanting to offend anybody, any developer who thinks "that's probably only a minor implementation detail" really does not know what they are talking about, and is in for a big shock.
May I suggest that you take a look at the 'jobs' forums on fgl.com where you will find a lot of game developers hang out.
As someone who mostly plays Chess 960 I think this looks really cool! I would love to try this. It would just be hard to remember what everything can do, at least at first.