The player adds this card to his hand and discards another.

Each player takes a turn, either taking a face-up card from the discard pile or a facedown card from the stockpile. The dealer then places the remaining cards facedown, creating the stockpile, and turns the top card face up next to it, creating the discard pile.

Note that the knocker is never allowed to lay off cards on the opponent's sets or runs.Each player is dealt 10 cards.If a player goes gin, the opponent is not allowed to lay off any cards.For example if the knocker has a pair of twos as deadwood and the opponent has a third two, this cannot be laid off on the twos to make a set.) 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 and runs laid down by the knocker - by adding a fourth card of the same rank to a group of three, or further consecutive cards of the same suit to either end of a sequence. The opponent of the player who knocked must spread their cards face-up, arranging them into sets and runs where possible.A player is never forced to knock if able to, but may choose instead to carry on playing, to try to get a better score. A player who can meet the requirement of not more than 10 deadwood can knock on any turn, including the first.Although most hands that go gin have three combinations of 4, 3 and 3 cards, it is possible and perfectly legal to go gin with two 5-card sequences.) Gin is knocking with no unmatched cards at all, and earns a special bonus.

Ending the play in this way is known as knocking, presumably because it used to be signalled by the player knocking on the table, though nowadays it is usual just to discard face down.and the total value of the deadwood must be 10 points or less. Any remaining cards from their hand which are not part of a valid combination are called unmatched cards or deadwood.This is done by discarding one card face down on the discard pile and exposing their whole hand, arranging it as far as possible into sets (groups of equal cards) and runs (sequences).A Player can end the play at their turn if, after drawing a card, they can form sufficient sets and runs of their cards into valid combinations.

Written rules for gin rummy