jsnjake16

My partner and I were playing in a knockout recently and we ended up defending 3NT. A little over half-way into the play, my partner was on lead, and we had already taken 4 tricks. He thought about his play for about 20 seconds when I realized that he had one of his tricks turned wrong, so he thought we had only taken 3 tricks. I didn't think much of it and told him he had one wrong. He then laid down an ace to set it. Any other lead would've given them the contract, and it seemed clear that he wouldn't have played the ace if I didn't tell him that we had actually taken 4 tricks already. The opponents never said anything but I was wondering if there were any laws broken?

My partner and I have decided to have any preemptive openings be transfers showing a weak opening in the suit directly above starting with 2♦. We are playing in an upcoming C-level knockout, and I was wondering if we need to do anything special such as pre-alert or if it is allowed on the general convention chart? Thanks.