Rule 15: Grab the momentum.

In a game between highly skilled poker players, there is a certain «momentum» aspect to the game – and an alternating attempt to take control of this momentum. From hand to hand as the game progresses, this momentum is often up for grabs. It's a little like tennis, where one player charges the net while the other is forced to back up. Or perhaps you could compare it to a football team that starts «deep in its own territory» and never seems to get out of this spot, constantly backed up to its own goal line by the opponent.

Such use of momentum by skilled players is used to get (and keep) other players down. This grabbing of the momentum is sometimes called «taking control of the game». (This can happen over longer time spans, too. Player A may grab the momentum for hours, days, perhaps even weeks, then something will change and Player В will take control for a period of time.) To survive in this type of game, if the chance to grab this momentum offers itself, you must take it.