Where all eyes are focused when the chess tournament is in motion (2,3,4)
I believe the answer is:
on the move
'in motion' is the definition.
(thesaurus)
'where all eyes are focused when the chess tournament' is the wordplay.
I cannot really understand how this works, but
'when' could be 'on' (I've seen this in other clues) and 'on' is found within the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is present in the answer.
This may be the basis of clue (or it may be nonsense).
'is' is the link.
Can you help me to learn more?
(Another definition for on the move that I've seen is " Travelling".)