It is called a "foot fault".
If your foot is on the serving line
tony Adams was arsenals longest serving player ever but in the current team its fabregas
They have to be behind the serving line, but they can jump past this line when serving.
Milos Raonic...with a serving speed of 225km/h
A strategy is dominant if, regardless of what any other players do, the strategy earns a player a larger payoff than any other. Hence, a strategy is dominant if it is always better than any other strategy, for any profile of other players' actions. Depending on whether "better" is defined with weak or strict inequalities, the strategy is termed strictly dominant or weakly dominant. If one strategy is dominant, than all others are dominated. For example, in the prisoner's dilemma, each player has a dominant strategy
A Nash equilibrium, i got this right =)
A zone defense is a strategy used in a basketball game. Zone defense- a defensive strategy where everyone guards an area instead of a player.