High invasion of mixed three space extension

    Keywords: MiddleGame, Joseki

W1 is not as common as the invasion at a (see low invasion of mixed three space extension), because Black's response at a will usually connect the two black stones together. Alternatively, Black may choose to attack W1 with b. W1 alone is usually not a good play: usually W1 is used in conjunction with a white stone at c.


Trying to cut with W3 is unreasonable. In this diagram, White has achieved nothing. If W7 is played at W8, Black will cut at B7.


Trying to live this way is too low for white, and tends to give away too much influence to Black. Later, Black a will capture W1.


Normally the wedge at W3 is too big a sacrifice because it gives Black a ponnuki, but in some specific situations separating black+circle may be worth the sacrifice. In some other situations W7 may be played at a, but Black b can seal the white group in.


With the white+circle stone W1 can be a more severe invasion than W2. When B2 tries to connect, W3 and W5 works in co-ordination with white+circle. Then W1 is placed in an excellent position, at the vital cutting point.

Another idea  

Charles In examples from actual pro games, the previous diagram occurs; but other variations do, too. For example W1 here before rescuing the cutting stone white+square.

Also, Black may simply play tenuki after the invasion, treating the whole area lightly.

High invasion of mixed three space extension last edited by CharlesMatthews on May 26, 2003 - 15:58
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