Crossword Genius

Good scope offered by opening on board (6)

Ross

I believe the answer is:

gambit

'opening on board' is the definition.
(opening move in chess)

'good scope' is the wordplay.
'good' becomes 'g' (abbreviation).
'scope' becomes 'ambit' (synonyms).
'g'+'ambit'='GAMBIT'

'offered by' acts as a link.

(Other definitions for gambit that I've seen before include "Opening sacrifice made in chess game" , "Initial move found in bag, Tim" , "Stratagem in chess" , "opening on board" , "Sacrificial chess opening" .)

I've seen this clue in The Telegraph and The Times.
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