an Entity references as follows:
The middlegame in chess is the portion of the game in between the opening and the endgame, though there is no clear line between the opening and middlegame or between the middlegame and endgame. The middlegame begins when both players have completed the development of all or most of their pieces and the king has been brought to relative safety. However, at master level, the opening analysis may go well into the middlegame.