Well thank you for finding it but I have fixed the problem. There was an error in my position function that was incorrectly fixing the position so the engine was indeed sending illegal moves.

Thank you VERY much for all of your help with this engine. Ill make sure to put you in the credits.

"You might try logging the through-put to try to determine this."


How would I go about doing this?

Ah. That was exactly the problem. I never realized that GUI would be unable to read directly from the command line.

However there is still a problem. Arena keeps saying that the engine is making an illegal move.
In the command line the text seems something like this.

User enters "go"

Engine ...

What do you mean by "flushing the output"?

From what we found, "Forcing all buffered output to actually be printed is known as "flushing" the stream." Is that not the same as the engine using the printf or cout commands to print text in the command line?

The engine sends its response instantly. Unless there is some command that I am missing? As far as I can tell the engine only needs to receive the engine name author name then send "uciok" and "readyok". Here is a link to download the a compile of the engine if you want to take a closer look. http ...

Essentially you need to do some sort of non-blocking I/O. This should be in various open-source engines, though I agree it can be rather tricky (and OS dependent). I think Crafty, Fruit, IvanHoe, Stockfish, and others all have examples. See posix.cpp of Fruit, and the input_available() function ...

Hello All,

My friend and I are currently working on coding an engine from scratch. We have almost complete a very simplistic version but we are currently having trouble with implementing the UCI protocol. We have no idea how to create the PV and dump it to the GUI. Also, we have no idea how to make ...