Double check

abcdefgh
8
g7 black king
e5 black pawn
f5 black pawn
d4 black queen
g3 white bishop
a2 black pawn
f1 white king
g1 white rook
8
77
66
55
44
33
22
11
abcdefgh
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.

  1. ^ Hooper, David; Whyld, Kenneth (1992), The Oxford Companion to Chess (second ed.), Oxford University Press, p. 113, ISBN 0-19-866164-9
  2. ^ Golombek, Harry (1977), Golombek's Encyclopedia of Chess, Crown Publishing, p. 88, ISBN 0-517-53146-1
  3. ^ Tim Just and Daniel Burg, 2003, U.S. Chess Federation's Official Rules of Chess, 5th ed., ISBN 0-8129-3559-4, p. 218