Throw-in
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A throw-in (Japanese horikomi, Chinese pu) is a sacrifice play in which at least one stone is captured by the opponent, played in order to destroy eye shape or reduce liberties.
For another sense of throw-in in English, see Throwin Ko.
A throw-in is different from a nakade. A nakade is a play inside a real eye. A throw-in makes or maintains a false eye.
, trying to squeeze one extra point out of Black, is a mistake.
Black can throw in at , and the eye here is false. Even if White takes at a, Black does not have to respond, as the eye at
will never become real.
at
would have been life.
In this example, a throw-in is used to remove the eye which White could have made here. A throw-in is often the first move in a snap back, shortage of liberties, or oi otoshi sequence; or a squeeze tesuji.
--MortenPahle (10kyu)
A very common and useful technique is the throw-in under three. --Dieter
Another common application of the throw-in tesuji to destroy eyes can be found at Beginner Exercise 4. --unkx80
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