I am still frightened by your plans, how to permit asynchronous commands in 
GTP. Here are some remarks and questions:

genmove is only one of many commands that the user might want to abort. We use 
GTP extension commands for starting life and death searches or other lengthy 
computations and many of them can be aborted at any time. Do you really want 
a sync and async version and a different abort command for each of them? 
Potentially every GTP command can be a candidate for aborting. If a 
controller provides support for engine-specific extension commands without 
specifically knowing what they do (like GoGui's Analyze Commands), there 
should still be a way to let the user send an abort request and let those 
commands abort that are able to.

Why is it necessary that the async genmove returns an immediate response?

- Markus
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