An outpost is a square, usually in enemy territory, where a piece (most often a knight) settles in beyond the reach of any pawn attack. No enemy pawn can ever dislodge it: it’s one of the most valuable squares on the whole board, and one of the most sought-after strategic goals in the middlegame.

What makes a good outpost

A square only counts as a solid outpost if the enemy pawns that could attack it are gone (traded off or never pushed) and can never reach it again. In practice, what matters are the pawns on the two neighboring files: for an outpost on d5, you need to watch the opponent’s c- and e-pawns. Ideally, your own piece sitting there is also supported by one of your pawns, making it nearly untouchable.

The white knight on d5 is a perfect outpost: supported by the e4 pawn, no black pawn can ever attack it.

In this position, Black no longer has a c- or e-pawn able to ever attack d5: the white knight can settle there for good, almost immune to any forced trade.

The knight, king of outposts

The knight benefits from an outpost more than any other piece, since it’s the only piece whose reach is limited to a few specific squares: the closer it is to the center, the stronger it gets. A knight firmly planted on a central outpost can be worth a rook in certain closed positions, disrupting the coordination of every enemy piece. A bishop or a rook, on the other hand, keep most of their strength even far from the center, so an outpost helps them far less.

How to create and exploit an outpost

The classical method is to provoke or wait for the trade of the pawns that could contest the target square, then post your piece there, ideally with pawn support. Once the outpost is established, don’t give it up without a very good reason: it’s generally worth more than its nominal value. For the opponent, the best defense is to trade off the piece occupying the outpost as soon as possible, or to avoid, from the opening, pawn structures that leave the square unguarded.

Many openings lead naturally to well-known outposts, such as the d5 square in several lines of the Sicilian Defense.

Frequently asked questions

Does an outpost always need pawn support?

It’s not required, but it’s clearly preferable. Without pawn support, the outpost stays out of reach of enemy pawns, but the piece occupying it can still be chased away or traded off by other pieces with no compensation.

Can only the knight occupy an outpost?

No, but it’s by far the piece that benefits the most. A bishop or even a rook can occasionally settle on an advanced, protected square, but the effect is less dramatic, since those pieces are already strong from a distance.

How do you stop your opponent from setting up an outpost?

The simplest way is to avoid, from the opening, trading off or advancing the pawns that guard the sensitive square. If the outpost is already in place, look to trade off the piece occupying it as soon as possible, before it becomes too strong.