@lastKANAshima They explained it weird, but the answer is correct. You take one on the first turn, and then on your next turn,you always make sure that the total amount taken between you and the other person is five. If they take 4, you take one. If they take 3, you take 2. If they take 2, you take 3. If they take 1, you take four. Basically, if you go first, and you take one, you can create a scenario where the other person has no chance to win