In a heap there are 2021 stones. Two players A and B play removing stones of the pile, alternately starting with A. A valid move for A consists of remove 1,2 or 7 stones. A valid move for B is to remove 1,3,4 or 6 stones. The player who leaves the pile empty after making a valid move wins. Determine if some of the players have a winning strategy. If such a strategy exists, explain it. combinatoricsCombinatorial games