We've been experiencing some difficulty with our server that hosts all of the PlayStrategy bots. We have plans to upgrade this server, but until this happens, we've had to disable some of the Stockfish bots for now, to try and ensure the reliability of all the other bots.

This is related to why people have noticed @PS-Greedy-Tom has been unavailable during some tournaments.

For now we have all the PS bots enabled, and also @Stockfish-level5. We will monitor if we can bring other levels back into play, and hope to have all back in action soon.