RTG Problem 16 / Solution
Since the given sequence is a joseki, there is of course no problem with
and
.
The solution is to crawl one more time at
, before jumping out at
. And this is joseki.
The reason is because if
jumps out too early, then
is a tesuji that makes a and b miai.
If
defends on the upper side, then
and
captures the two White stones.
If
saves the two stones, then
onwards can capture the corner.