I'd never heard of that puzzle, seems like a great test for ChatGPT though. Wikipedia defines the problem as: You are shown a set of four cards placed on a tab

I'd never heard of that puzzle, seems like a great test for ChatGPT though. Wikipedia defines the problem as: You are shown a set of four cards placed on a table, each of which has a number on one side and a colored patch on the other side. The visible faces of the cards show 3, 8, red and brown. Which card(s) must you turn over in order to test the truth of the proposition that if a card shows an even number on one face, then its opposite face is red?