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Re: Constant CPU load of approx. 5% / UCI mode question

From: Antonio Ceballos
Subject: Re: Constant CPU load of approx. 5% / UCI mode question
Date: Mon, 25 Feb 2019 01:36:38 +0100

Hi Nic,

Thank you for your feedback using GNU Chess.

CPU usage of 5% in 6.2.4 may be normal, but should be negligible in 6.2.5. The way to handle input was changed.

As you may know, the UCI mode is not intended for human interaction, but mainly for interaction with programs such as chess GUIs. Moreover, UCI 'go' is not the same as GNU Chess 'go' command (non UCI mode). If you want to play a game in UCI mode interactively, you should type other UCI commands before go, mainly, ucinewgame. The UCI standard includes an example.

Antonio Ceballos

On Sat, Feb 23, 2019 at 2:48 PM Nicolas Peifer <address@hidden> wrote:


I have two problems (I'm not sure if they are bugs):

gnuchess has a CPU load of approximately 5% even when not thinking ("gnuchess -e"). Is this normal?

When I start gnuchess (version 6.2.4 or 6.2.5) in UCI mode, i. e. "gnuchess -u", and enter "go" nothing happens. I have to enter something like "go infinity" or "go depth 5" in order to make it work. Is this a bug (default configuration missing)? The UCI "standard" says:

"go     start calculating on the current position set up with the "position" command.
    There are a number of commands that can follow this command, all will be sent in the same string.
    If one command is not sent its value should be interpreted as it would not influence the search."

Best regards,


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