Finally, the second player could reduce the first player's total sum by 30 cents, but at a cost of ten cents to himself-in other words, he lost money too by doing so.

最后乙可以选择使甲的财产减少30美分，但是作为代价他自己也必须拿出10美分--换句话说，这么做乙自己蒙受了损失。