Rooks that can not see well
Source: Saint Petersburg MO 2020 Grade 11 Problem 2
May 7, 2020
combinatorics
Problem Statement
A short-sighted rook is a rook that beats all squares in the same column and in the same row for which he can not go more than -steps.
What is the maximal amount of short-sighted rooks that don't beat each other that can be put on a chessboard.