sealed move

British  

noun

1. chess the last move before an adjournment, which is written down by the player making it, sealed in an envelope, and kept secret from his opponent until play is resumed

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Example Sentences

At the start of play Spassky took one fleeting glimpse at Fischer’s sealed move, which won by force, meaning that there was no ambiguity to the position: Bobby had a clear win that was demonstrable and resolute.

From Literature

“I should have played here as my sealed move,” said Spassky, moving a little plastic piece and trying to demonstrate how he might have held on to the game.

From Literature

White resigned after Black’s sealed move of 41 … Bd3+, having no need to see lines like 42.

From Washington Times

Yet he still might have drawn the game with a better sealed move before adjournment.

From Time Magazine Archive

Upon the resumption of an adjourned game the position existing at the time of adjournment shall be set up and the sealed move made on the board.

From Project Gutenberg