tderz: where is the ko here ?
tderz: this is ko about as Black cannot simply connect at as there there is the cutting point a.
tderz: Hence, as diagram (2) does not necessarily seem to end in ko (cf. proof diag. (3)),
and here is not necessary to create the eye e,
is not efficiently placed.
tderz: Only when changing the order like this,
Black seems to be forced to follow diagram (4).
Dave: It looks like White has to make Black decide how to reply before determining how to continue in the corner...
Dave: If Black captures at , White can now play . If Black tries a hane ( or first), White throws in on the opposite side ( or White a) and gets a ko on one side or the other after ...
Dave: If Black descends at , White forces with and then lives with since Black can not play at a due to shortage of liberties.
Dave: If Black continues on the right, then White is able to force Black on the left before living with .