Wedge - four-space extension

    Keywords: Opening
[Diagram]

The four-space extension

An extension as far as W3 is interesting here, but provocative. Black may well invade.

[Diagram]

Perfect shape for White

Now White's stones are perfectly placed.

[Diagram]

Black invades

Therefore it is natural enough for Black to invade, and try to make the marked white stone into a target for attack. B4 as shown is popular in pro games: a is also seen, while b was played in older games.


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