All too often I see a team holding both holding the same suit for the last card. This should almost never happen.
Even worst is when the lone could have been stopped but the partner chose to save the wrong ace.
While you can't stop all, here are a couple of things you can do to increase your chances.
Frist lead plays a major role here. Give your partner as much information as you legally can.
First, don't lead that single ace. If it is the stopper, it will still be at the end. Think about what that does to your partner.
Now if you have two aces then lead one. This will tell your partner you still have another ace.
Second, show your partner the suit you can not stop by playing that suit the first time you can't follow the suit led by the lone-maker.
Third, Hold your double suit till the end. This way your partner knows what suit your holding for the last trick.

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