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This week, we change genres, from direct mates to helpmates. But
this is not an ordinary helpmate, but a duplex. Ordinarily
in helpmates, Black moves first, and helps White to mate
him in the stipulated number of moves. That is indeed what
happens in the first solution here. But in the second
solution, the boot is on the other foot: White moves first
and helps Black to mate him in the same number of moves!
With Black moving first, the solution runs
1.e5 Kd3 2.Kd5 Ra6 3.Bc5 e4 mate.
The second solution, with White moving first, is as follows:
1.Ke5 Kc6 2.Rf4 Kd7 3.e4 Bb2 mate.
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