Tair Pair

Tair Pair is a game in which the player needs to find paired items that are located in the game area. The items are hidden behind square cards. The goal of the game is to find all pairs of objects by making the least possible number of mistakes. A mistake-free game is a game in which you do not make unnecessary useless card reveals. If you have opened a card that you have opened before, you must already collect a pair in this move, otherwise you will earn a penalty point or even two.
What are the possible mistakes:
1) if there is an opportunity to collect a pair, but you don’t do it
2) if you re-open a card you opened earlier, but you don’t collect a pair in this turn.
3) You can even get two errors per turn if you reveal two cards that you have previously revealed, but you don’t collect a pair.