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In chess, a fork is a tactic in which a piece attacks multiple enemy pieces simultaneously. The attacker usually aims to capture one of the forked pieces. The defender often cannot counter every threat. A fork is most effective when it is forcing, such as when the king is put in check. A fork is a type of double attack.
double attack Two attacks made with one move: these attacks may be made by the same piece (in which case it is a fork); or by different pieces, for example in a discovered attack when the moved piece also makes a threat. [119] double check A check delivered by two pieces at the same time. A double check necessarily involves a discovered check ...
In chess, a discovered attack is a direct attack revealed when one piece moves out of the way of another. [1] ... The result is a double check: One check is given by ...
One pattern involves castling queenside to deliver a double attack: the king attacks a rook (on b2 for White or b7 for Black), while the rook attacks a second enemy piece (usually the king). In the example shown, from the game Mattison –Millers, Königsberg 1926, [ 18 ] Black played 13...Rxb2 ?? and resigned after 14.0-0-0+, which wins the rook.
A special case of a discovered check is a double check, where both the piece being unmasked and the piece being moved (rarely a third piece instead, possible in the case of an en passant capture) attack the enemy king. A double check always forces the opponent to move the king, since it is impossible to defend against attacks from two ...
The only possible reply to a double check is a king move, as it is impossible to block or capture both checking pieces at once. In exceptional circumstances, it is possible for the moved piece in a double check to not give check. The only way for this to happen in orthodox chess is by way of an en passant capture. In the position shown from ...
Double-Move Chess: Similar to Marseillais chess, but with no en passant, check, or checkmate. The objective is to capture the king. By Fred Galvin (1957). [41] Double-Take Chess: Each player, once per game, can make two moves during one of their turns. These two moves cannot be used to place the opponent's king in checkmate.
Double attack – attack on two pieces at once, such as in a fork, or via a discovered attack where the piece that was blocked attacks one piece while the piece moving out of the way threatens another. Double check – check delivered by two pieces at the same time. [11] [12] In chess notation, it is sometimes symbolized by "++".