ASU 091 All Soviet Union MO 1967 499 white castles and 1 black king
Source:
June 20, 2019
combinatoricsChessboard
Problem Statement
"KING-THE SUICIDER"
Given a chess-board , white castles and a black king. Prove that it does not matter neither the initial situation nor the way white plays, but the king can always enter under the check in a finite number of moves.