race condition in challenge acceptance

[bruce-ricard]

I clicked on a first challenge in the lobby. I saw the loading spinning animation like usual, which lasted a bit longer than usual (about 2-3 seconds), and then I got back to the lobby. I tried clicking a second game, same result. A third game, same result.
Then after a couple of seconds, out of nowhere, the game page shows up and I'm asked to play. I play my first move and a new game starts on top of it. I try to fix everything but I guess I was too slow, because before I know it my profile contains 2 aborted games and a lost one after 1 move.

My internet connection was quite bad at that moment, which is what might have triggered the race condition.

It feels like you should have some sort of mutex per user to prevent them from successfully accepting multiple challenges at the same time. When you go to the lobby while a game is in progress, you usually see a message saying that you already have a game in progress. Maybe this message needs to be triggered as soon as a challenge is accepted, not only when the game "starts", whatever that means.