I must not gaze at them although
Your eyes are dawning day;
I must not watch you as you go
Your sun-illumined way;
I hear but I must never heed
The fascinating note,
Which, fluting like a river-reed,
Comes from your trembling thro... Read more of The Barrier at Martin Luther King.ca
(Chessboard Problems)
Now, how many bishops are necessary in order that every square shall be
either occupied or attacked, and every bishop guarded by another bishop?
And how may they be placed?