What is the opening?
The opening is the initial phase of a chess game. It is the moment when both players develop pieces, control the center, and prepare their position for the middlegame.
During this phase, the idea is to bring your pieces to good squares, put the king in safety, and build a healthy position from which you can play with clarity.
Chess openings: from the first moves to your repertoire
Within this phase, many concrete openings can be played. A chess opening, in that sense, is the set of first moves that aims to reach a specific type of position.
Each opening has typical ideas, plans, and structures that have been studied for years to understand the best way to play it.
Within the same opening, there can also be different variations. A variation is a concrete path inside that opening, which changes according to each player’s moves. That is why studying openings can be complicated: it is not enough to memorize a first sequence of moves; you also need to understand what to do when your opponent responds differently.
That is where the concept of an opening repertoire starts to appear. A repertoire is a coherent set of files containing the lines and variations of the openings you are going to play. It is not about saving isolated moves, but about covering the main responses and important deviations your opponent can choose, while keeping positions you understand, can update, and can train again.