Battery in chess: how it works
Two or more pieces lined up on the same file, rank, or diagonal to multiply their force.
A battery is two (or more) pieces of the same type lined up together - rooks doubled on a file, rooks and queen on a rank, or queen and bishop on a diagonal. The pieces combine their firepower and put enormous pressure on a single line.
Doubling rooks on an open file is one of the most common and effective strategies in chess. The two rooks support each other: if the opponent captures the first, the second recaptures immediately.
A queen-and-bishop battery on a diagonal (like the b1-h7 diagonal attacking the castled king) is one of the most dangerous attacking setups in the game.
Battery examples
Two rooks doubled on the seventh rank - a classic rook battery
Two rooks on the seventh rank create a powerful battery. They control every square on that rank, cutting the king off from its pawns and threatening multiple captures at once. The opponent cannot easily challenge both rooks. This formation is called 'pigs on the seventh' in chess slang because the rooks devour enemy pawns at will.
Queen and bishop battery aiming at the castled king
The white queen on e2 and bishop on d3 form a battery on the b1-h7 diagonal. Both pieces aim at h7, the weakest point next to the castled black king. This battery exerts enormous pressure and often leads to a devastating attack, especially if white can follow up with moves like Ng5 or f5 to break open lines toward the king.
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