Outpost (chess)
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An outpost is a square in an open file which is protected by a pawn. Outposts are a favourable position from which to launch an attack, particularly using a knight. The reason an outpost is so strong is that it is immune to attack from major pieces (rooks and queens) because of the pawn, whilst if the enemy wishes to attack it with a pawn it generally weakens its own pawn structure.
Knights are most efficient when they are close to the enemy's stronghold. This is because of their short reach, something not true of bishops, rooks and queens. They are also more effective in the centre of the board than on the edges. Therefore the ideal to be aimed at is an outpost in one of the central (c,d,e or f) files in an advanced position (i.e. 6th rank) with a knight. Knowledge of outposts and their effectiveness is crucial in exploiting situations where you have an isolated queen's pawn.
On the other hand, Nimzovich argued when the outpost is in one of the flank (a,b,g and h) files the ideal piece to make use of the outpost is a rook. This is because the rook can put pressure on all the squares along the rank.
