putting queen's on the chess board.
Source: Iranian RMM TST 2021 Day3 P2
April 16, 2021
combinatoricschess
Problem Statement
In a chess board we call a group of queens independant if no two are threatening each other. In an by grid, we put exaxctly one queen in each cell ofa greed. Let us denote by the minimum number of independant groups that hteir union contains all the queens. Let be a positive integer, prove that Proposed by Alireza Haghi