Arno: my try.
Arno's 2nd try:
Bill: What if Black does not reply in the bottom left corner, but plays on the top side instead? E. g.,
instead of
.
Arno: if Black plays
at
then White answers with
at
. Mutual damage. Eventually either Black answers on the lower left, or White connects to
then answers Black's play at the top. In both cases W+1.