英文的规则是这么写的“the player may use the open information from the layout to
show that certain cards are no longer available. The player may not use any information
from his own hand.Unplayed Tactics cannot prevent a Flag claim.”
只能用已经打出的牌来证明，不能利用自己手牌里的信息，没有打出的战术牌是不能影响宣布的
A是可以宣布了
