When a player thinks their hand is almost completely melded, they can decide to knock even if they still have unmelded cards in their hand. Players must balance the possible reward of ending the round early agapps and gamesainst the risk of revealing their hand, which adds an interesting layer of strategy. Before scoring is determined, a player who knocks gives their opponent one last opportunity to lay off any unmelded cards onto their own melds. Gin Rummy's scoring mechanism encourages aggressive play and calculated strategy by rewarding players with points based on the number of unmelded cards remaining in their opponent's hand.