Part

Opening

You might say: opening phase, first phase of the game

The opening is the first phase of a chess game, from the first move until the game makes a subjective transition into the middlegame.

What it does

Establishes the early development, central contest and king-safety choices that shape the position to come.

Ask

What is each side developing toward, and when does the opening give way to the middlegame?

What to look for

1. Early development
2. Central contest
3. Castling and king-safety choices

Parts

• Opening principles: A practical opening checklist is to contest the central squares, develop knights and bishops toward active squares, castle, and keep watching the opponent's checks, captures and threats.
• Opening system: A system opening is a recurring setup designed to remain usable across many possible replies, such as the Réti or Colle systems.
• Opening repertoire: An opening repertoire is the deliberately chosen and consistently used set of openings a player employs as White and as Black.

Sources

1. Chess.com, Chess Openings (Chess Terms), What Is The Opening?The opening is the first phase of a chess game, starting from the very first move.
2. Chess.com, Chess Openings (Chess Terms), What Is The Opening?When the opening ends and the middlegame begins is a subjective question that depends on the flow of each game.
3. Chess.com, Chess Openings (Chess Terms), What Is The Opening?Generally, the goal for both players in the opening is to develop the pieces, control the center, and get the king safe.

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