 In this case the defending player receives an "undercut bonus" (usually 25 points) plus the difference in deadwood points.If the defending player has less or equal deadwood to the knocking player's deadwood after laying off any of their deadwood, then it is still a valid undercut.If all 10 cards in a player's hand fit into melds and thereby the player has no deadwood, they can choose to "go Gin" in which case the round ends and the player going Gin receives a Gin bonus of 25 points (or another established amount) plus any deadwood points in the opponent's hand.