📁 邮件
Play-by-mail gaming involves strategic or roleplaying games which are played via email or postal mail. Typcially each player will send his or her orders to the moderator, or GM, who will determine what happened in the game for the particular turn, and send updates to each player. Computer-moderated PBEM (play-by-email) gaming uses a computer program as the moderator instead of a human.
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Eric Weisstein's World of Mathematics: Dots and Boxes
http://mathworld.wolfram.com/DotsandBoxes.html