No, you want the poker face; you don't want your opponents to be able to discern anything, and if it seems to a judge that you might be communicating informatio

No, you want the poker face; you don't want your opponents to be able to discern anything, and if it seems to a judge that you might be communicating information based on your reactions to certain plays then you could be disqualifed. So you need the poker face, and you need a surreptitious system to exchange information out of band.