No, you don't. You still only have to check those 2 cards. If you're asking about card 3 then that's the common mistake – it doesn't matter whether that card ha

No, you don't. You still only have to check those 2 cards. If you're asking about card 3 then that's the common mistake – it doesn't matter whether that card has a number or an emoji on the other side, because the only logical test here is that if it has an even number on one side, the other side must be blue. It doesn't matter what blue cards have on the other side, we don't need to test them. edit: sorry, I just realised you're referring to card 1 and not 3, yeah I suppose you'd need to check it too unless there's a rule about always needing to match a color to a number.