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In a recent tournament, a West Surrey club member arrived at this corner position. It is slightly bigger than a "Carpenter's Square" and was named the "Lumberjack's Rectangle" by Reading Go Club.
This shows the "tidy" set of moves. Is it naïve of White to expect this?.
This shows what could happen with an aggressive Black and a trepid (?) White. Disaster for White.
Which lets White live easily. Black can cause more havoc than this.
Having investigated this in the past month, I have concluded that this problem is non-trivial and that I am unable to provide a full answer this month. I will present my findings so far - they may be incorrect, feel free to let me know any errors - and I'll come back to this problem in a few months time.
Let us start investiagting the hane on the long side. Diagram 3 showed what can go wrong if answered recklessly.
14 at .
Some dan players suggested that rather than capturing Black 1
directly, running along the first line might help. In this example here,
it appears to - the result is a seki.
Black 7 is strong.
In this particular sequence, White cannot atari the Black stones, whilst Black can capture the 3 White stones on the edge and connect out. This kills White.
Assorted variations on White 8 et al exist, all leave White dead.
I conclude that answering the hane like this is bad for White.
Answering at the 2-3 point seems a better move. Here White lives
with one eye at and one from capturing either 5 or 7.
So far every Black attempt to kill after this White 2 has failed.
I also think that White 2 at the 2-2 point works - not yet fully investigated.
These five diagrams show moves which have been confirmed by GoTools as leaving White alive. They may not be optimal, but they do work.
I may come back and add a diagram or two to this "long side
hane" page later.
I will address other Black attacks including the short side hane and the 2-2 point in future months.
Problem of the month
British Go Association
Last updated 2004-08-10
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