In the traditional rules of Gin-Rummy:

  1. Is going Gin worth 20 or 25 points?
  2. Is undercutting worth 10 points?
  3. If a player knocks and is undercut by their opponent and this opponent lays off and has no deadwood, do they get a Gin bonus of having no deadwood?
  • One variant of rules can be found here Jun 19 '18 at 6:16
  • It looks like you are asking multiple questions and it is best to split them up into separate questions so they can all get properly answered
    – Joe W
    Aug 18 '19 at 20:29

Gin-Rummy has many scoring variantions. As Andrew suggested in a comment, Paget is a good source for rules of card games.

From Paget:

Some people play that the bonus for going gin is 25 (rather than 20) and the bonus for an undercut is 20 (rather than 10). Some play that the bonus for an undercut, the bonus for going gin, and the box bonus for each game won are all 25 points.

The score on Wikipedia are 25 points per gin, undercut and box bonus.

Both Zinga's popular app Gin Rummy Plus, and cardgames.io use 25 points bonuses for undercuts, gin and box bonus.

For the third question, the answer is no, that player just get the undercut bonus.

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