Provided that the knocker did not go gin, the opponent is also allowed to lay off any unmatched cards by using them to extend the sets laid down by the knocker - by adding a 4th card of the same rank to a group of 3, or further consecutive cards of the same suit to either end of a sequence. If a player goes gin, the opponent cannot lay off any cards. You should note that the knocker cannot lay off cards on the opponent's sets. The game also ends if the stock pile is reduced to 2cards, and the player who took the 3rd last card discards without knocking. In this case, the hand is cancelled, no points are scored, and the same dealer deals again.

SCORING

Each player counts the total value of their unmatched cards. If the knocker's count is lower, the knocker scores the difference between the 2 counts.

If the knocker did not go gin, and the counts are equal, or the knocker's count is the greater then the knocker has been undercut. In this case the knocker's opponent scores the difference between the counts plus a ten point bonus.

A player who goes gin receives a bonus of twenty points, plus the opponent's count in unmatched cards, if any. A player who goes gin can never be undercut. Even if the other player has no unmatched cards at all, the knocker gets the twenty point bonus and the other player does not score.

The game then continues with further deals until one of the players has a  cumulative score of one hundred points or more. This player then receives an added bonus of one hundred points. If the loser failed to score anything at all during the game, then the winner's bonus is two hundred points instead of one hundred.

Each player adds a further twenty points for each hand they won. This is called the box bonus or line bonus. These extra points are not counted as part of the one hundred needed to win the game.

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