Answer:
We have 14 friends, and each team must have 6 players:
Then, in the two teams, we have 2*6 = 12 players.
This will mean that 2 of the friends can not be included in the game.
To solve this:
For example, each of those 2 players go to one of the teams, so we actually have two teams of 7 players.
Only 6 of them will play at the time, and the other player will rotate each fixed amount of time
Then the correct answer would be:
Rotate the players (in the teams) so all of them can play.