Battery (chess)
Encyclopedia
A battery in chess
Chess
Chess is a two-player board game played on a chessboard, a square-checkered board with 64 squares arranged in an eight-by-eight grid. It is one of the world's most popular games, played by millions of people worldwide at home, in clubs, online, by correspondence, and in tournaments.Each player...

 is a formation that consists of two or more pieces on the same rank, file, or diagonal. It is a tactic
Chess tactic
In chess, a tactic refers to a sequence of moves which limits the opponent's options and may result in tangible gain. Tactics are usually contrasted with strategy, in which advantages take longer to be realized, and the opponent is less constrained in responding.The fundamental building blocks of...

 involved in planning a series of captures to remove the protection of the opponent's king, or to simply gain in the exchanges
Exchange (chess)
In the tactics and strategy in the board game of chess, an exchange or trade of chess pieces is series of closely related moves, typically sequential, in which the two players capture each others pieces. Any types of pieces except the kings may possibly be exchanged, i. e. captured in an...

. Other chess authors limit battery to "an arrangement of two pieces in line with the enemy king on a rank, file, or diagonal so that if the middle piece moves a discovered check will be delivered." However, in Chessgames.com
Chessgames.com
ChessGames.com is a large chess community on the Internet, with over 156,000 members. The site maintains a large database of historical chess games where every game has a distinct message board for comments and analysis. Basic membership is free and the site is open to players at all levels of...

 blogs and game annotations of other chess websites, the term is also used in cases where moving the middle piece will uncover a threat other than a check along the opened line.

It is particularly effective to form a battery using rooks
Rook (chess)
A rook is a piece in the strategy board game of chess. Formerly the piece was called the castle, tower, marquess, rector, and comes...

 because they may be combined to occupy the same rank or file. In theory, bishops
Bishop (chess)
A bishop is a piece in the board game of chess. Each player begins the game with two bishops. One starts between the king's knight and the king, the other between the queen's knight and the queen...

 may also form a battery in a case of underpromotion of a pawn to a bishop occupying the same diagonal as the other bishop. In actual games, however, the queen
Queen (chess)
The queen is the most powerful piece in the game of chess, able to move any number of squares vertically, horizontally, or diagonally. Each player starts the game with one queen, placed in the middle of the first rank next to the king. With the chessboard oriented correctly, the white queen starts...

 and rooks are often employed.

Batteries are often used as part of a combination
Combination (chess)
In chess, a combination is a sequence of moves, often initiated by a sacrifice, which leaves the opponent few options and results in tangible gain. At most points in a chess game, each player has several reasonable options from which to choose, which makes it difficult to plan ahead except in...

 which may involve other types of chess tactics as well. In some chess openings, the queen is often involved in the set up, and becomes part of a battery but is reserved for the final capture in the series of exchange of pieces. For example, in the main line of the Closed Sicilian
Sicilian Defence
The Sicilian Defence is a chess opening that begins with the moves:The Sicilian is the most popular and best-scoring response to White's first move 1.e4...

 characterized by 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3 d6, where White's main options are 6.Be3 followed by Qd2 and 0-0-0; and 6.f4 followed by Nf3 and 0-0, White's intention is to form a battery with his rooks.

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