When to trade

Club players trade for the wrong reasons: because a capture is available, because the position feels tense, because trading “simplifies”. Trading is not neutral. Each exchange rewrites who is better, and the six rules below decide nearly all of them.

1. Ahead in material: trade pieces. Behind: trade pawns.

The first half is the converting rule. The second half is its mirror: when you are a pawn down, every pawn trade brings the position closer to an endgame with too few pawns for the opponent to win. Rook endgames with pawns on one side are famously drawn a pawn down. Get there.

2. Trade your bad piece for their good one

The rule players between 1200 and 1800 miss most. Not “trade when ahead”, but which piece. A bishop stuck behind its own pawns is worth less than a knight with an outpost. A knight on the rim is worth less than a bishop on an open diagonal. When a trade is available, name the two pieces: is yours the one doing less? Then trade.

The picture to remember: pawns fixed on the colour of your bishop means a bad bishop. Keep the other one; trade this one at the first chance.

3. Trade the defender

If one enemy piece is holding a position together (the knight that covers the entry square, the bishop that guards the weak pawn), trade it, even for a nominally better piece. The pieces left behind are what matter, not the count.

4. Do not trade when the attack needs the piece

Attacking with three pieces against a king is often winning. With two it is often not. The defender knows this and offers trades. Every trade the attacker accepts is a piece off the attack. Say no unless the trade removes a key defender.

5. Trade queens when your king is the worse one

If your king is exposed and theirs is not, queens off. If theirs is exposed and yours is safe, keep them on. The queen is the piece that punishes an open king; nothing else comes close.

6. Look at the endgame you are heading to

Some endgames are drawn no matter what: opposite-coloured bishops with few pawns, rook and one pawn against rook in most cases. Some are won: a good knight against a bad bishop, an outside passed pawn. Before a trade, ask what is left. “Simplification” that leads to a drawn ending is not simplification. It is offering a draw.

The tell

A capture is available and your reason for making it is “why not”. That is the trade to think about for a minute.

The habit

Before any exchange, two questions: "Which of these two pieces is doing more?" and "What is left after?" If you cannot answer the first, the trade is a coin flip. If the second is an endgame you would not choose, decline.