3.7 XBoard chess engine

Running the program with the "–xboard" command line parameter sets it to produce output acceptable to and accept input suitable for XBoard, the graphical display front-end with mouse interface.

For historical reasons the option "xboard" does not need to be preceeded by "–"; however we would encourage the new syntax.

How to run XBoard with GNU Chess as backend (first chess engine):

xboard -fcp 'gnuchess --xboard'

xboard -fd . -fcp './gnuchess --xboard'

How to run XBoard with GNU Chess playing against itself:

./xboard -fcp './gnuchess -x' -fd . -scp './gnuchess -x' -sd . -pieceImageDirectory 'svg' -matchMode T -tc 1