Obligations when playing
Why People Get This Wrong
People think they can intentionally underplay a card when their partner is winning just to throw off opponents' strategies, but actually, they must still follow the obligation to play a legally required beat even if their team has the trick won. The confusion arises because this rule seems counterintuitive in situations where players might assume their partnership's lead should dictate strategy.
Official Verdict
These duties apply even when a player's partner is currently winning the trick. A player may not intentionally underplay when holding a card that is legally required to beat the current winner.