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Extension
Difficulty: Beginner
Keywords: Opening, Shape, Tactics, Strategy
See also:
This figure shows some more common extensions.
Why so far? This is only one of the possibilities. The purpose is to deny White a two space extension. If it communicates well with stones on the lower side it is the best move.
White has no choice but to make another extension.
Black plays keima Everything stops for some time here, because the value of the moves temporarily drops. White can build eyes in the corner or in the center when attacked. Playing a at the moment is not big enough. For Black, exchanging a for a white stone in the center is not favourable. Both sides wait for the development in other areas. At some point of the game a will become urgent. --HolIgor
Black 1 is sometimes called an extension but should more properly be called a stretch. It is rock-solid, but not very good at expanding territory. It is usually only played when the stone being aided must be fortified. This kind of extension is known as nobi or iron pillar. This is a copy of the living page "Extension" at Sensei's Library. ![]() |