1 … i4-g4
White had 3 possibilities to recycle pieces: on the h1-h6
line, on the c7-i3 line, and on the a5-i1 diagonal. The first option
was excluded any way (because of Black’s 2. … a5-h2;xGe7). Through
playing 1. … i4-g4, Black also eliminated the second option, leaving
White no other choice than to play 2. I3-d2;x. Black answers with
2. … e9-e5 and is sure to capture White’s last GIPF with 3. … f1-d2;xGe6.