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: 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: 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.)