How do piece values actually change what counts as a good tactical trade?
These answers restate the rules implemented by our open-source engine, which follows the WXF laws and is regression-tested against the official 110-diagram repetition casebook. Where an answer refers to a specific position, that position lives on the linked reference page, where the build verifies it against the engine before publishing.
Direct answer
A tactic that looks material-even on the surface, a capture for a capture, can still be a great trade or a poor one once you actually weigh the point values involved: exchanging a soldier for a horse is nothing like exchanging a horse for a chariot, even though both are technically "a piece for a piece."
Why counting captures instead of values leads you astray
It is tempting during fast calculation to just count the number of pieces exchanged rather than their relative worth, especially in a long forcing sequence. A three-for-three trade that actually swaps your chariot and two soldiers for the opponent's horse, cannon and a soldier is not a wash just because the piece count matches; work out the values properly before trusting the sequence.
Applying this mid-calculation
When you find a forcing sequence, tally the actual point values captured by each side at the end of it, not just the number of exchanges, using the standard relative values covered at piece values. A combination that wins the exchange, trading a lesser piece for a chariot, is usually worth pursuing even if it looks roughly even piece-for-piece on the surface.
Related questions
Do piece values change between the opening and the endgame?
Their relative ranking stays broadly similar, though some pieces, particularly soldiers and the general's escorts, become relatively more valuable as the board empties.
Is winning 'the exchange' always worth it?
Usually, but not automatically; check whether the resulting position is actually easier to convert, not just materially ahead on paper.
.