Hi Hartmut,

With Winboard you can try the next:

-Startup Winboard
-Select first machine Polgar
-Select second machine Excel68k
OK

In the open window (Polgar) select the level key without enter

On Winboard Window select Mode >two machines or CTRl+T

On the second window (Excel68k) select the level and enter.

On the Polgar Window clear level and enter and automatic play begins.

Saludos,
Luis