Once there was a little yellow Tulip, and she lived down in a little
dark house under the ground. One day she was sitting there, all by
herself, and it was very still. Suddenly, she heard a little _tap, tap,
tap_, at the door.
"Who is that... Read more of THE LITTLE YELLOW TULIP at Children Stories.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?