Original sentence: The first game is simply sequential-when player 2 has the chance to move, they are aware of whether player 1 has chosen O(pera) or F(ootball).This is the common way to show that when player 2 moves, they are not aware of what player 1 did
Edited sentence: The first game is simply sequential-when player 2 has the chance to move, he or she is aware of whether player 1 has chosen O(pera) or F(ootball).This is the common way to show that when player 2 moves, he or she is not aware of what player 1 did