Anal Bead

To most people anal beads are just sex toys they stick in their butts, however anal beads with with remotely controlled vibration can also serve as a well hideen one-way communication device. Use of an anal bead for cheating in chess has been the topic of a great cheat scandal in 2022 (Niemann vs Carlsen).

{ Still not as intense as women chess where recently some bitch poisoned her opponent's lipstick :D ~drummyfish }