Prior discussion : how (not to) answer if black resists. [#2998]

Timm: Prior discussion : how (not to) answer if black resists. (2014-04-07 17:35) [#10036]

Jesusin: This is a diagram from the book "Get strong at invading". It is a middle game joseki. There are other possibilities for .

The text (answer to problem 107) says White is alive after the sequence.

But I do not seem to find this group alive. Here are my variations:

Continuation 1, is White alive?

Up to White is dead. If White a next, then Black b.

What am I missing?

Charles Matthews Try at , as in Continuation 2, but after playing White b, Black a. Black is short of liberties. If Black is very strong locally it may be possible to kill White after White comes out at . For example, the game between Fujisawa Hideyuki and Go Seigen, 1973-11-18.

Continuation 2, is White alive?

Up to White is dead. If White a next, then Black b.

What am I missing?

Andrew Walkingshaw: What if, instead of a...

Continuation 2, White makes two eyes

White plays at here, living locally through . If, instead, Black tries the play at below:

Continuation 2c, connect and die (6 at 3)

White can play as shown here, catching the outside stones and making an eye on the edge.

Jesusin: Thank you very much, Charles and Andrew.

Continuation 2d, White dies

Olo: After white dies. White can live only if have not played before.

White escapes or lives I
White escapes or lives II

Hans: White should hold the cut (2 in Continutation 1,2) in reserve. Then white can escape or -if black prevents this- live as shown in the 2 diagrams above.