BQM 526
Does the 3-3 invasion under this unconventional 4-4 enclosure lead to ko, or can black kill unconditionally?
I believe that W can live or escape unconditionally. The strongest threats to W would seem to be at a, b, and c. None of those lines seem to lead to an unconditional kill, or even a ko to kill.
tapir: As always all comments without warranty. I don't see how White is going to live unconditionally in the corner after b. However White does not need to live there.
If
at
, then Black connects at
. White is running with no base. Better to probe at
or a without the
/
exchange.
Is
performing any useful function? The triangle is empty. W has 'c' to look forward to later as well. This is an inverted move order for
@
to start.
Question has been raised: what about probing at a or b before the 3-3 invasion? How does that play out?
Herman: The standard idea after
would probably be
, after which there are several options.
Herman: With moves like this, black can reduce white to only one (potential) eye in the corner, but white has escaped, so black should have a clear plan to continue the attack.
Herman: blocking on this side allows life, because
forces
. Black should of course keep
in reserve.
Herman: White can answer
with
.
is required, otherwise White will play there. The
makes life, because a is still sente for white.
-- thanks for this, I missed that obvious move.
Herman:
is a vital point, but the exchange of
for
allows life again. (The atari at a is pointless, black will sacrifice and squeeze for oshitsubushi.)
![[Diagram]](../../diagrams/25/41b471bb828e31bc145b06100054b93d.png)
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, so
is not sente and White can't live unconditionally here. Ko next or
if White can't make an eye on the edge.![[Diagram]](../../diagrams/6/acd0b4217d8c99012c63fe8614eaea82.png)
![[Diagram]](../../diagrams/4/14bf3df5fd04b0759b4a16b693afbd4c.png)
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