So, they're getting an average of 0.25 in this game. But we can now shift our strategy as player two, to ensure we get tails more often, which guarantees that player one now gets negative 0.5 in this case. In the heads case that means they will get to 0.5 for choosing play, but that doesn't really matter because they're already getting 0.5 for this earlier deviate action. So, we're not really giving up anything in this situation, we're just making ourselves better off. Because they would never gets to the situation