White's first concern was that Black was holding
the last move. So, he had to look for a way to get piece back
into his reserve. 1.i3-f6 makes sure that he will, because
Black can't play 1
g1-g6 (which would leave 2.h6-b3;xGc4).
Now it is Black who must look for a way to recycle pieces. That
in itself is not too difficult (e.g. 1
f2 would be
sufficient) but he has a problem: if White captures on the c7-i3
line, it will clear spot d7, through which he establishes
an attack on Gd5. Black has no move which can make sure
he can form himself a row with his next move and break White's
attack on his last GIPF-piece at the same time.
Note that 1.c7-e7 would not have been a win
for White, because then 1
g1-g6 would have left White
no way to recycle pieces.