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Wie viele Königinnen (Königinnen) müssen alle Schachbrett angreifen?

Antwort: Fünf. Zum Beispiel:

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 h |  |  |  |  |  |  |  |  |
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 g |  |  |  |  Q |  |  |  |  |
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 f |  |  |  |  Q |  |  |  |  |
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 e |  |  |  |  Q |  |  |  |  |
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 d |  |  |  |  Q |  |  |  |  |
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 c |  |  |  |  |  |  |  |  |
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 b |  |  |  |  |  |  |  |  |
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 a |  |  |  |  Q |  |  |  |  |
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