TalkChess.com

[H.G.Muller]

Well, it is a good question why it is sending all these isreadys in the first place. Normal procedure is that you send only a single isready after having sent all setoptions in response to uciok, to make sure you don't continue before the engine is done processing all the option settings.

Sending isready only makes sense when you want to wait for the readyok before proceeding. Sending an extra isready upfront subverts this. In particular you can now send 'go' before the previous setoption has been received by the engine. I think this is a protocol violation. Whether there are engines for which this is harmful, I don't know.