Hi Frank,
Thanks for your report. I think that the problem comes from the way GNU Chess is
invoked.
When you want to run it from XBoard, you must use the --xboard flag. The manual
of GNU Chess (info gnuchess) includes a couple of examples that show how to run
XBoard from the command line specifying GNU Chess as the first chess engine.
For instance:
xboard -fcp 'gnuchess --xboard'
If you just simply type
the interaction between both programs will not work.
The way XBoard invoked GNU Chess can be seen in xboard.debug. You should see
something like:
StartChildProcess (dir=".") gnuchess --xboard
In your attachment, the --xboard flag is missing.
Please let me know if this is of help to solve the problem.
Regards,
Antonio