Crossword Genius

Arranged chess board in practised moves (3,6)

Ross

I believe the answer is:

set pieces

I'm a little stuck... Click here to teach me more about this clue!

'practised moves' is the definition.
Although both the answer and definition are plural nouns, I can't understand how they can define each other.

'arranged chess board' is the wordplay.
'arranged' becomes 'set' (similar in meaning).
'chess board' becomes 'pieces' (I can't explain this - if you can you should believe this answer much more).
'set'+'pieces'='SET PIECES'

'in' is the link.

Can you help me to learn more?

(Other definitions for set pieces that I've seen before include "Elaborate formal speeches" , "Practised manoeuvres" , "rehearsed moves" , "all 32 on board?" , "bishops and others?" .)

I've seen this clue in The Daily Express.
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