Throw-in
A deliberate sacrifice that changes liberties, eye space, or the tactical direction of a position.
Also known as
A Throw-in is a move played into or next to an opposing formation where the new stone will usually be captured. The stone is deliberately exposed or sacrificed because its capture changes the resulting shape or liberties in a useful way.
A throw-in may remove a liberty, reduce or destroy eye space, force atari, or prepare a snap-back, ko, or another tactical sequence. Its defining feature is not simply that a stone is sacrificed: it is played into a capturable position for a specific tactical effect, making it more precise than a general sacrifice.
The move is worthwhile only when the gain in liberties, eyes, or tactical prospects outweighs the lost stone. The opponent may sometimes ignore the throw-in or respond differently if the position allows it.
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