If the value of deadwood cards is equal after a knock (after the non-knocking player adds deadwood to the knocking player's sets and runs), it is considered an undercut (see below).

When a player ends the round via knocking, they score the value of their opponent's deadwood cards minus the value of their own deadwood cards.

If there is ever 2 cards remaining in the draw deck at the start of a player's turn, all cards are reshuffled and hands are re-dealt to start a new round.

A card can only belong to one set or run at a time (as in cards, no cards can be shared across sets and/or runs).

They discard their final card and declare that they have gin, placing their hand on the table.

A player may 'go gin' if they have no deadwood cards in hand at all.

They may continue playing in an attempt to go gin.

A player does not have to knock even if they're eligible to.

The opposing player has the opportunity to play as many cards as possible into the knocking player's sets or runs. When a player knocks, they discard face down and lay their hand on the table declaring that they are knocking.

When a player has cards of 'deadwood' in hand (cards that are not part of a set or run) that have a total value of 10 or less, they may knock.

Play continues back and forth until a player 'knocks' or 'goes gin'.

Either way, a player always draws one card and discards one card on their turn (it may be the same card for both draw and discard).

They may either add the new card to their hand and discard a different card OR they may discard the new card.

On a player's turn, they simply choose to draw the top card of the discard pile or the top card of the deck.

Otherwise, the game would start with the player who took the card from the discard pile continuing their first turn. If neither player wants it, the non-dealer player would draw from the deck to start the game. If they do not want it, play passes to the other player and they can choose to take the card from the discard pile.

The round begins with the non-dealer player deciding whether or not to take the card from the discard pile.

The remaining cards form the draw deck in the middle of the table.

The dealer then discards the top card of the deck to start the discard pile. Shuffle and deal each player 10 cards, one card at a time.

Card values in Gin Rummy are as follows: A = 1, 2-10 = their own values in points, J/K/Q = 10.

Runs are 3-5 consecutive cards in the same the same suit.

In Gin Rummy, the goal is to create runs and sets with your hand of ten cards.

Gin rummy rules when to knock