sets up a snapback with and a monkey jump from .
Now b and e are miai, and c and f are miai. at a will be answered by at e or f.
However, a reverse monkey jump from the other direction does NOT work:
DaNoize?: What can white do to prevent connection when is played here?
Herman Hiddema: White can play a. After black b, white plays atari at c, cutting off the black group.