MathDB
ASU 519 All Soviet Union MO 1990 bw color in 1990 x 1990 chessboard

Source:

August 14, 2019
Chessboardsquare tableColoringcombinatorics

Problem Statement

Can the squares of a 1990×19901990 \times 1990 chessboard be colored black or white so that half the squares in each row and column are black and cells symmetric with respect to the center are of opposite color?