You&#x27;re moving the goalposts from what the article claims.<p>The opponent&#x27;s strategy is unknown and unspecified, per the puzzle. The point of the article is that there is a strategy that never does worse than chance, and may do better, depending on the opponent&#x27;s choice of numbers. Sure, the opponent can make your advantage arbitrarily small - the article says that directly. But the notion that they are trying to do so is not part of the puzzle, and finding a strategy that prevents them from doing so is not what the author claims to have done.