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Taking turns coloring cells

Source: CWMI 2017 Q4

August 14, 2017
combinatorics

Problem Statement

Let nn and kk be given integers such that nk2n\ge k\ge 2. Alice and Bob play a game on an nn by nn table with white cells. They take turns to pick a white cell and color it black. Alice moves first. The game ends as soon as there is at least one black cell in every kk by kk square after a player moves, who is declared the winner of the game. Who has the winning strategy?