Sealed orders; a sealed move in chess .

密封命令；象棋中封棋的一着。

youdao

A move in chess that directly attacks an opponent's king but does not constitute a checkmate.

将军下棋中直接进攻对方的“国王”但并没有彻底将死的一着。

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There is a unique chess rule which involves a special move in chess that many casual players are not aware of, the rule is called "en passant".

顺便有一个独特的国际象棋的规则，涉及一个特别行动在国际象棋，许多休闲玩家不知道，规则是所谓的“顺便”。

youdao

Any genuinely new trend is a knight's move. I just remind you, in chess the knight doesn't move in a straight line.

所以，任何新趋势都是迂回前进，我只是提醒大家一下，在国际象棋中马是不走直线的。

耶鲁公开课 - 1945年后的美国小说课程节选

The appointment of Prince Mohammed bin Nayef as interior minister represents a significant move in the complex political chess game that is being played out in the Saudi royal family.

BBC: New Saudi interior minister moves up succession ladder

The Democrat threat over tax rates is just the opening move in what promises to be an historic chess match played out using barroom brawl rules.

FORBES: Democrats Play Blackmail With Taxes: GOP Should Call Their Bluff

The GOP is not quite in checkmate but it is on the horizon, as Republicans have entered into what chess masters call Zugzwang, a situation in which every move available to a player simply worsens his position.

FORBES: The Grand Old Republican Party Is Over