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Ablock is adefensive tactic inchess in response to an attack, consisting ofinterposing apiece between the opponent's attacking piece and the piece being attacked. This type ofblocking will only work if the attacking piece is a type that can move linearly an indefinite number of squares such as aqueen,rook, orbishop and there is at least one empty square in the line between the attacking and attacked piece. Blocking is not an option when the attacking piece is directly adjacent to the piece it is attacking, or when the attacking piece is aknight (because knights "jump over other pieces" and cannot be blocked). When an opponent's attack on a piece is blocked, the blocking piece is to some extentpinned, either relatively or absolutely, until a future move by either side allows it to be unpinned.
Acheck on aking by an opponent's queen, rook, or bishop can sometimes be blocked by moving a piece to a square in line in between the opponent's checking piece and the checked king. The blocking piece is then absolutely pinned to the king by the attacking piece.
Another type of interposing in chess can involve placing a piece between two opponent's pieces where one of those pieces is protecting the other, or they are both protecting each other. Thischess tactic can be calledinterference.
When the attack cannot be ignored, the attacking player has theinitiative. The defending player may be able to acquire the initiative by blocking and attacking at the same time, by attacking an undefended attacker with the blocking piece, with adiscovered attack, or when the block is also a check or across-check.
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