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Encyclopedia > Double check

In chess, a double check is a check delivered by two pieces at the same time. Chess is an abstract strategy board game for two players. ... The word check has these meanings: In finance, a cheque (spelt check in American English) is an order for transfer of money. ...


The most common form of one check involves one piece moving to deliver check, at the same time revealing a discovered check from a piece behind (such a check is an inherent part of the type of smothered mate known as Philidor's legacy). The only replies to a double check are king moves, as capturing the checking piece (except by the king, which in the process moves out of check-by-the-other-piece) is not an option since there are two of them, and interposition is likewise impossible as there would be two lines of attack to block. In chess, a discovered attack is an attack revealed when one piece moves out of the way of another. ... In chess, a smothered mate is a checkmate delivered by a knight in which the mated king is unable to move because he is surrounded (or smothered) by his own pieces. ...

Exceptionally, the piece moved does not have to give check. The only way for this to happen in orthodox chess is by way of an en passant pawn capture. In the position shown to the right, Black has just played g7-g5 (see algebraic notation); white replies hxg6 e.p.+. This is a double check, yet the pawn moved does not give check: one check is given by the rook, the other by the bishop; the former is discovered by the movement of the capturing pawn, the latter by that of the captured pawn. Such a double check is extremely rare in practical play, but is sometimes found in problems. Image File history File links En_passant_double_check. ... En passant (from French: while [the pawn is] passing) is a maneuver in the board game of chess. ... The pawn (♙♟) is the weakest and most numerous piece in the game of chess, representing infantry, or more particularly pikemen. ... Algebraic chess notation is the method used today by all competition chess organizations and most books, magazines, and newspapers to record and describe the play of chess games. ... Sam Loyd, London Era, 1861 Excelsior by Sam Loyd. ...


In chess with variant rules or fairy pieces, other ways of delivering a double check may be possible. Triple checks may also be possible, for example: White rook e1, bishop e4, moas d3 and f3, king h1; Black king e5; White plays 1.Ba8 triple check (the moa is a non-leaping knight which first takes a diagonal step, then an orthogonal one). A chess variant is any game derived from, related to or similar to chess in at least one respect. ... A fairy chess piece or unorthodox chess piece is a chess piece not used in conventional chess, but used in certain chess variants and some chess problems. ...


  Results from FactBites:
 
DCVA Test procedures (1771 words)
The double check valve assembly should be installed to protect the public water supply from low or non-health hazards.
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Check valve #1 may fail immediately after the tester had certified that the assembly was working properly.
Double Check Valve Assembly (525 words)
Series 007 double Check Valve Assemblies shall be installed at referenced cross-connections to prevent the backflow of polluted water into the potable water supply.
Series 774 Double Check Valve Assemblies are designed to prevent the reverse flow of polluted water from entering into the potable water system.
Series 757/757N Double Check Valve Assemblies are used to prevent backflow of non-health hazard pollutants that are objectionable but not toxic, from entering the potable water supply system.
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