(In many forms of Rummy, the ace may rank either high or low.)
Knock Rummy is a variation of the popular Rummy matching card game.
The sevens are the most valuable card in the deck when it is time for forming melds. The seven can be used to extend melds more than any other card. Remember, you are more likely to win a gin rummy game if you: Try to score and knock as quickly as possible.
Gin–Rummy Playing Tips. Be the first to knock. Form triangles in your hand. Draw from discard only for melds. Middle cards are better. Don't wait for a card inside straight. Throw the big cards early. Knock as soon as possible. An undercut is better than getting ginned.