Counting cards in Batak means tracking which cards, especially trumps and high cards, have already been played so you can predict what opponents still hold. Since every card is dealt and players must follow suit, watching each trick tells you a lot. When someone fails to follow a suit, you learn they are void in it, which shapes your later plays. Keeping a rough count of the trumps that have appeared is the most valuable habit, because it tells you whether your remaining trumps are now the highest. You do not need perfect memory to start, but the more you track, the better your decisions on which card to lead or hold.