Basics
King safety
How exposed your king is to attack — usually the most important factor in the middlegame.
A safe king (castled, with intact pawns in front and defenders nearby) lets you play the rest of the board freely. An exposed king turns every enemy piece into a potential attacker.
Weighing king safety against activity and material is the central judgement of attacking chess.
Why it matters
More middlegames are decided by king safety than by anything else — a material edge means little next to a king under fire.
The mistake everyone makes
Opening lines near your own king to win a pawn, then getting mated by the pieces that pour through.
Related terms
Castling
The one move where the king and a rook move together, tucking the king to safety.
Luft
An escape square made for the king, usually by advancing a pawn in front of it.
Initiative
The ability to make threats the opponent must answer, keeping them reacting rather than acting.
Sacrifice
Giving up material on purpose for a larger gain — mate, more material, or a winning attack.
See King safety in your own games
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