4473 enclosure 3-3 invasion, block on inner side

  Difficulty: Advanced   Keywords: MiddleGame, Joseki
Blocking on inner side  

When Black plays at B1 here in reply to the 3-3 invasion white+circle, there will be some important reason to do with strategy.

If black+square were closer, the play at B1 would be weak. As it is, it is somewhat overconcentrated. Black may intend to recapture the corner, as in the main line below. This may well depend on a ladder relationship.

This idea occurs quite often in pro games, from Shusai's time to today.

This is the most common continuation. Black recaptures the corner, apparently in gote.

Note that Black may only want to play this when W7 at B8 can be answered by capturing W5 in a ladder.

After these plays, White at the circled point is very big: it can create shortage of liberties for Black after White at a.

Charles Matthews

4473 enclosure 3-3 invasion, block on inner side last edited by CharlesMatthews on October 20, 2003 - 13:21
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