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Ponderchess / Glossary

Luft in chess

Luft, German for "air", is an escape square made for a castled king by moving one of the pawns in front of it, usually h3 or g3 for White and ...h6 or ...g6 for Black. It removes the danger of a back-rank mate.

White to move. Taking the b7-pawn at once with Rxb7 would lose to Rd1 mate, because the white king is boxed in by its own pawns on f2, g2 and h2. h3 gives the king air on h2, so after Rd1+ Kh2 there is no mate and the rook on c7 is free to attack Black's queenside pawns.1.h3 Rd1+ 2.Kh2

Why the king needs air

After kingside castling the king usually sits on g1 behind pawns on f2, g2 and h2. Those pawns protect it from the front but also box it in. If an enemy rook or queen reaches the first rank and nothing can block or capture it, that is a back-rank mate.

Back-rank threats also restrict your own pieces. A rook that must stay on the first rank to guard against mate cannot go and attack, and a tactic that deflects it can decide the game.

Which pawn to move

The most common choice is h3 for White or ...h6 for Black. It gives the king a square on h2 or h7 and keeps the g-pawn in place, so the squares in front of the king are hardly weakened. As a bonus, h3 stops an enemy bishop or knight landing on g4, and ...h6 does the same for g5.

g3 or ...g6 also makes luft, but it weakens the squares beside the g-pawn and is best when a bishop can cover them. Every pawn move near the king has a cost: an advanced h-pawn can become a target for a sacrifice or a hook for the opponent's pawn storm.

When to make luft

Make luft at a quiet moment, before it becomes urgent, and especially before your rooks leave the back rank or before you send a piece to grab material far from your king. When you have time for one useful waiting move, luft is often a good candidate.

Common mistakes

  • Making luft only after the back-rank threat has become a concrete tactic, when it is too late.
  • Creating luft with a pawn move that seriously weakens the king, such as g3 with no bishop to cover the light squares.
  • Sending the last rook off the back rank to win material without first checking for back-rank mates.

Questions about luft

What does luft mean in chess?

It is German for "air" and means an escape square for the king, made by moving a pawn in front of it.

Is h3 or g3 better for luft?

h3, or ...h6 for Black, is the usual choice because it weakens the king least. g3 is fine when a bishop on g2 covers the light squares.

When should I make luft?

At a quiet moment, before your rooks leave the back rank and before the opponent can create a back-rank threat.