I have been watching the videos of the Vanderbit 2019 Final and found it very eductional - the minds of experts. But one thing puzzled me. Watching this session
It seems that Levin and Weinstein (possibly others) just placed their played cards in front of them in any orientation, whether the trick is won or lost. The opponents seem to follow the standard where placing a card in portrait orientation means your side won the trick, and in landscape, you lost. Is this because, being a top top tournament, there is an official recorder recording the hand and so no matter how you place your cards, the official record of tricks won/lost is with the recorder? Perhaps these top players don't need to look down to see how many tricks they have won or lost - they know in their heads?