This one features a quiet key with subtle variations showing bi-valve line openings and closings following next. White to play and mate in 2. What is the key move?
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1. Rh8 Nc6 - The bishop on b2 is opened up; there's no Nh7# anymore. How does White finish off?
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1. Rh8 Nb5 - Black stops Nh7#. How does White finish off?
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1. Rh8 Ne6 - How does White finish off?
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What if Black plays 1... Ne2? How does White finish off?