It's not cheating if you use allowed information bits (eg card value, not the orientation it was placed on the table) and disclose the systems to your opponents

It's not cheating if you use allowed information bits (eg card value, not the orientation it was placed on the table) and disclose the systems to your opponents. The bidding also has some rules about allowed systems, but it's the same kind of thing. It's a great game for hackers, but the boomers kind of ruin the fun sometimes.