Box2Glory is the most detailed simulation management game for the sport of boxing. The game is inspired by Football manager and as such as gym management including finance,staffing, boxer management, interactions with media, etc.
The fight strategies are the most detailed for a boxing game with strategies that need to be suited for each match, given you stats, your opponents, the referee assigned, venue selected, etc.
The game is played in 24 hour turns and does not reward players with more time to spend online, nor does it reward any players that choose to pay money for certain additional features. It is fair for all and there is no advertisement on a site.
The game also includes tournaments and real life matches you can run against other users at any time.
For more detail check out the game manual http://www.box2glory.com/b2gmanual.pdf and the forum site http://box2glory.proboards.com/