Trading when you are ahead
Being up material is not the same as winning, and the difference is usually a trade you did not make.
5 minute read
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The rule, and why it works
Ahead on material, trade pieces and keep pawns. Behind, trade pawns and keep pieces.
It works because material advantage grows as the board empties. A rook against a bishop is an annoyance in a full middlegame and decisive in an endgame, and every pair of minor pieces that leaves the board makes the extra rook larger relative to what remains.
Up material, every trade makes the advantage bigger.
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The trap
The rule is about pieces, not about the queen specifically, and it is not a reason to trade into a worse endgame. A won position given away in a pawn ending is still given away.
The check is simple: before a trade, ask what the position looks like after it, not whether the count still favours you. The count always favours you — that is why you are trading.
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When you are behind
The reverse is not symmetrical. Keeping pieces on when you are down material is not about hoping for a blunder; it is about keeping the position complicated enough that technique alone does not finish it.
Practically, that means avoiding queen trades, keeping pawns on both wings, and steering toward positions where the pieces have something to do.
Put it to work
The honest test of a lesson is whether the thing it warns about stops appearing in your games. That is what the trainers measure.