Prisoners will understand the en passent rule. Any prisoner mistakenly accusing his opponent of cheating after playing en passent spends a night in the box.
Prisoners will not hang pieces. Any prisoner needlessly hanging pieces spends a night in the box.
Prisoners will not play 1. a4 and 2. Ra3. Any prisoner playing that combination spends a night in the box.
Prisoners will not attempt the scholar's mate. Any prisoner attempting a scholar's mate spends a night in the box.