The middle game is the heart of chess, play dynamic chess

The middle game is the field of battle on which victory or defeat is decided. The middle game is a war between the pieces and pawns of both sides. 

image credit: medievalchronicles.com

The middle game has all of the possibilities of planning attacks, sacrifices, combinations, tactics.

When transitioning into the middle game from the opening, you need to analyze and evaluate the position thoroughly. Then, make a plan. 
In the middle game, you need to be creative and aggressive. 
Activate, coordinate, and prepare your pieces for action.

Dynamic play in the middle game in chess is all about the emphasis on short-term piece play over static structure. Dynamic play is considered a major strategic element of a position.
The dynamic approach develops immediate potential to gain a decisive advantage.

A lead in development, the mobility and activity of the pieces, and the grabbing and holding on to the initiative are the key factors of dynamic play in chess.

Development refers to which side has more pieces involved in the game and who has castled or not castled.

Piece interaction is taking about who has the better placed pieces, whose pieces have more or better open lines, and how active our pieces are. For the purpose of attacking in the middle game, the interaction of the pieces is the most important factor of dynamics play.

 The initiative means who is responding to the opponent’s threats. If you have the initiative, you call the shots. Your opponents may have to play passively and be constantly on the defensive, having to react to your moves. They may begin nervously tapping their feet, biting their nails or even regress to sucking their thumbs. Players with the initiative dictate the course of the game.

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