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Solution 4
White: a2-e6;xb3,c4,d5
White could not attack Ge4 right away, because Black was
holding the last move and, more over, could capture the piece on e7.
Through 1.a2-e6;x White recycles pieces and lines up 3 pieces on the
e1-e9 diagonal at the same time.
Black has 2 options now. He can play 1
b6-g4 and leave himself a
sure way to recycle pieces on the c1-c7 line with his next move. But that is
no solution because White will put a piece on e8. Black's 2
c7-c4;x
will make that spot c6 becomes vacant and White has a winner with 3.i2-c6;xGe4.
But the second option, 1
a3-f7;x, isn't any better, because the
piece on d6 was Black's defense. So, White plays 2.e8 and there's
nothing Black can do: 2
f8-d8 will be followed by 3.c7-e7
and White captures Ge4 with his next move.