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BQM43
   

Whilst playing a game today, I thought I had the corner sealed up. But then my opponent played the marked stone and, after losing the corner, I resigned. What should I have done?

[Diagram]
Diag.: Here comes the pain


[Diagram]
Diag.: Trying to defend

I was worried that black would sneak through and connect up with the big wall to the right, so I tried to block this. Obviously, this was a losing strategy. He got real strong and I got split up (and surrounded on the left).

HolIgor: Prior to reading any variations I'd like to say that with the strong support from the outside I'd expect black to live in the corner. So, my first concern would be to find how to limit him there while keeping sente. Then, having that basic variation I'd start to read out a possible kill.


[Diagram]
Diag.: Without any imagination

Just minimizing the damage white presses black down. Black gets 6 points in the corner in gote. Playing at a is another gote move worth another 8 poitns dairi counting.

White can make a similar profit elsewhere. That's basic.


[Diagram]
Diag.: Can white survive in the corner in sente?

Some points but gote.


[Diagram]
Diag.: Can white survive in the corner in sente?

White gets the stones in gote. So black cannot cut with 4.


[Diagram]
Diag.: Can white survive in the corner in sente?

Isn't black comfortably dead?



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