There are complex rules about forced plays; a simple example is when someone who has just taken their second trick holds the ace of trumps. Since the ace of trumps is unbeatable, they "must" play it as their next card. Similar occurrences are when a player has taken one trick and has both ace and king or (more complex) ace, queen and jack. This is sometimes called the "cinch win" rule. If it is a "cinch" that you will win, you must win immediately by laying down the winning cards all at once. While the rules themselves are simple in theory, details about forced plays can make Bourré challenging for even a skilled player.