Thinking about competition in games: direct vs. indirect and implicit vs. explicit:
http://www.mostdangerousgamedesign.com/2013/05/competition-in-games.html
Tips & Resources for Board Game Designers
Thinking about competition in games: direct vs. indirect and implicit vs. explicit:
http://www.mostdangerousgamedesign.com/2013/05/competition-in-games.html