> > Q2: Should a program accept a move when there is an > > undo pending? No, it should not accept a move, and give a very clean error message. Also the subject line should be have to include the name of the oponent with the word undo request. "Wari board 78 jeroen undo request" and directy the possible answers with a help text. "Wari move 78 jeroen <pw> [accept|reject]"