Centralisation
Placing pieces (and the king in the endgame) in or near the centre for maximum reach.
A piece in the centre controls more squares and can swing to either wing quickly, so centralising your forces is a core principle: knights on central outposts, rooks on central files, the queen active but safe, and — once the middlegame danger passes — the king marching to the centre.
Centralisation is both an attacking and a flexibility idea. Centralised pieces support play on either flank and are ready to redeploy, while decentralised pieces (a knight on the rim, a rook stuck in the corner) do far less than their nominal value.
Central pieces simply do more — a centralised army generates threats on both wings, which is why 'centralise' is one of the most reliable rules of thumb.
Leaving knights on the rim and rooks passive while chasing a small material gain, so your pieces never reach their potential.
Related terms
See Centralisation in your own games
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