Type cmail from a shell to start a game as white. After an opening message, you will be prompted for a game name, which is optional—if you simply press <Enter>, the game name will take the form ‘you-VS-opponent’. You will next be prompted for the short name of your opponent. If you haven't played this person before, you will also be prompted for his/her email address. cmail will then invoke XBoard in the background. Make your first move and select ‘Mail Move’ from the ‘File’ menu. See File Menu. If all is well, cmail will mail a copy of the move to your opponent. If you select ‘Exit’ without having selected ‘Mail Move’ then no move will be made.