Double check

In chess, a double check is a check delivered by two pieces simultaneously. In chess notation, it is almost always represented the same way as a single check ("+"), but is sometimes symbolized by "++" (however, "++" is also sometimes used to denote checkmate).

单词	Doublechecking
释义	Doublechecking 英语百科 Double check In chess, a double check is a check delivered by two pieces simultaneously. In chess notation, it is almost always represented the same way as a single check ("+"), but is sometimes symbolized by "++" (however, "++" is also sometimes used to denote checkmate).
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Doublechecking

Double check