Повернення до головоломок

Скільки коней потрібно, щоб атакувати всю дошку? Щоб контролювати всю дошку?

Відповідь: Чотирнадцять коней, щоб атакувати всі клітини дошки: 

  1 2 3 4 5 6 7 8
  ___ ___ ___ ___ ___ ___ ___ ___
 h |  |  |  |  |  |  |  |  |
  --- --- --- --- --- --- --- ---
 g |  |  |  N |  N |  N |  N |  |  |
  --- --- --- --- --- --- --- ---
 f |  |  |  |  |  |  |  |  |
  --- --- --- --- --- --- --- ---
 e |  |  N |  N |  |  |  N |  N |  |
  --- --- --- --- --- --- --- ---
 d |  |  |  |  |  |  |  |  |
  --- --- --- --- --- --- --- ---
 c |  |  N |  N |  N |  N |  N |  N |  |
  --- --- --- --- --- --- --- ---
 b |  |  |  |  |  |  |  |  |
  --- --- --- --- --- --- --- ---
 a |  |  |  |  |  |  |  |  |
  --- --- --- --- --- --- --- ---
Можна скористатися таким варіантом: 
  1 2 3 4 5 6 7 8
  ___ ___ ___ ___ ___ ___ ___ ___
 h |  |  |  |  |  |  |  |  |
  --- --- --- --- --- --- --- ---
 g |  |  |  N |  |  |  N |  |  |
  --- --- --- --- --- --- --- ---
 f |  |  |  N |  N |  N |  N |  |  |
  --- --- --- --- --- --- --- ---
 e |  |  |  |  |  |  |  |  |
  --- --- --- --- --- --- --- ---
 d |  |  |  N |  N |  N |  N |  |  |
  --- --- --- --- --- --- --- ---
 c |  |  N |  N |  |  |  N |  N |  |
  --- --- --- --- --- --- --- ---
 b |  |  |  |  |  |  |  |  |
  --- --- --- --- --- --- --- ---
 a |  |  |  |  |  |  |  |  |
  --- --- --- --- --- --- --- ---
Щоб контролювати (атакувати, або займати) всі клітини дошки, досить 12 коней: 
  1 2 3 4 5 6 7 8
  ___ ___ ___ ___ ___ ___ ___ ___
 a |  |  |  |  |  |  |  |  |
  --- --- --- --- --- --- --- ---
 b |  |  |  N |  |  |  |  |  |
  --- --- --- --- --- --- --- ---
 c |  |  |  N |  N |  |  N |  N |  |
  --- --- --- --- --- --- --- ---
 d |  |  |  |  |  |  N |  |  |
  --- --- --- --- --- --- --- ---
 e |  |  |  N |  |  |  |  |  |
  --- --- --- --- --- --- --- ---
 f |  |  N |  N |  |  N |  N |  |  |
  --- --- --- --- --- --- --- ---
 g |  |  |  |  |  |  N |  |  |
  --- --- --- --- --- --- --- ---
 h |  |  |  |  |  |  |  |  |
  --- --- --- --- --- --- --- ---