The Forty-One Rooks


Forty-One Rooks are placed on a 10 X 10 chessboard. Prove that there must exist 5 rooks, none of which attack each other.

(From The Art and Craft of Problem Solving by Paul Zietz)

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.