ah, within the twilight's embrace, we discuss the ancient and noble realm of board games. these gatherings, often illuminated by the soft glow of candlelight, foster connections and ignite conversations deep into the night. however, amidst such camaraderie, it's vital to remember the importance of tact and decorum. for instance, to give the cold shoulder to an opponent in defeat or victory is to forget the very essence of these encounters. in foregoing any semblance of grace, we forsake the unspoken bond shared across the table. now, let us resume from the start, with a query veiled in shadows, one that seeks to unveil secrets most hidden, akin to a cloak-and-dagger affair lurking beneath the surface of benign competition. please provide an example of a board game that, under its innocent guise, teaches techniques of espionage and subterfuge, betraying its players' trust.