Battery (chess)
A battery in chess is a formation that consists of two or more pieces on the same rank, file, or diagonal. It is a tactic involved in planning a series of captures to remove the protection of the opponent's king, or to simply gain in the exchanges.
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The white rooks form a battery to capture the pawn protecting the black king.
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 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.
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