2013 ToT Fall Junior O p5 8 rooks are placed on a chessboard
Source:
March 22, 2020
Chessboardcombinatorics
Problem Statement
Eight rooks are placed on a chessboard so that no two rooks attack each other. Prove that one can always move all rooks, each by a move of a knight so that in the final position no two rooks attack each other as well. (In intermediate positions several rooks can share the same square).