Chess term; a check delivered by two pieces simultaneously
For other uses, see Double check (disambiguation).
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From this position, 1.Bxe5++ is a winning double check.
In chess and other related games, a double check is a check delivered by two pieces simultaneously.[1][2] In chess notation, it is almost always represented the same way as a single check ("+"), but is sometimes symbolized by "++". (The symbol "++", however, is also sometimes used to denote checkmate.[3]) This article uses "++" for double check and "#" for checkmate.
This article uses algebraic notation to describe chess moves.
^Hooper, David; Whyld, Kenneth (1992), The Oxford Companion to Chess (second ed.), Oxford University Press, p. 113, ISBN 0-19-866164-9
^Golombek, Harry (1977), Golombek's Encyclopedia of Chess, Crown Publishing, p. 88, ISBN 0-517-53146-1
^Tim Just and Daniel Burg, 2003, U.S. Chess Federation's Official Rules of Chess, 5th ed., ISBN 0-8129-3559-4, p. 218
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