I feel the same, I have participated in aichallenge.org before and everything was run server-side, we had a 1 second move limit too, I have not run any starter yet to try it out but seems like using HTTP will have big issues with timing, I would prefer something that connects to a socket and keeps the connection up, would reduce some of the latency of establishing a connection.

Some people created a tcp server for the Ants one that allowed that: https://github.com/berak/ants-tcp I don't remember much of the details, since it was nearly 5 years ago, but it was an awesome thing to participate in.