When the opponent defects, the player will occasionally cooperate on the next move anyway.

I've tried to get us to lose, but the players aren't cooperating.

A player can also create corps to play with friends and cooperate with other people.

Will the different players cooperate, or will they stab one another in the back?

Two players can cooperate to rack up the score and clear the board.

The two players cooperated with federal authorities and admitted to receiving money.

Such a plan can help restore confidence and get all the players to cooperate.

The players are allowed to (and supposed to) cooperate within the team; the cooperation of teams is forbidden.

Multiple players could cooperate to complete wrestling moves on one enemy.

Thus, while players could cooperate, any cooperation must be self-enforcing.