3 parts to a chess game :
Opening
gets ready for the rest of the game
placing the pieces ready for the middlegame
Castling
Opening complete when Rooks connected
Is the Opening Over ? For White  ?       For Black  ?
How many moves have been made ?    For White ?      For Black ?
Is the Opening Over ? For White  ?       For Black  ?
How far till White is developed (if not developed) ?
How far till Black is developed (if not developed) ?
What moves do you think best to make to complete development (the opening) ?
Middlegame
where both sides capture, form combinations and plans
Endgame
still a fight
few pieces left
finishing up