Crossword Genius

Deadlock as board move out? (9)

Ross

I believe the answer is:

stalemate

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'deadlock' is the definition.
(I know that deadlock can be written as stalemate)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for stalemate that I've seen before include "A no-win situation in chess" , "Deadlock, impasse" , "Possible chess game ending" , "Deadlocked position" , "situation without a winner" .)

I've seen this clue in The Times.
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