Assume the following 3-player game consisting of several rounds. Players A and B build a team, they have one fair coin each, and may initially talk to each other. Before starting the first round, however, no more communication between them is allowed until the end of the game. (Imagine they are separated in different places without any communication infrastructure.)
Previously Asked Coin Puzzles:
Five Thieves and Bounty
Discussion on Hacker News: http://news.ycombinator.com/item?id=4985537
Update: (29 Jan 2013)
Correct solution by: Takaki, Andre, Felix, JDGM in comments!
Correct strategy (but not so correct calculation) by Joshua, Shubham Mittal in comments!
If you are just looking for the solution, Perfect solution by Andre. Thanks