The overall goal is to get to a sum of zero in your hand.  Green cards have positive values, and red cards have negative values.  The two nulls do not add value, although they improve your hand.  The winner of a game is the person closest to zero.  If there is a tie that is not zero, then positive numbers win over their negative counterparts.  If there is still a tie, then the better hand wins.

Hands are evaluated by how they got to zero (or the lowest number).  The more cards in your hand that total zero, the better.  Two null cards make up the best hand in the game and are an automatic win (called Pure Sabacc).  There are lots of lore-appropriate names for the hierarchy of hands, such as Bantha’s Wild.  In general, the order of poker hands is close to the order of Sabacc hands.

For example, if two people get to zero; one has a green 3 and a red 3, and the other has a green 7 and a red 7, the hand with the higher numbers wins.  If both have the same numbers but one has a null card, that person wins, since they had more cards.  

A hand that got to zero with three red 3s and a green 9 would have the poker equivalent of three-of-a-kind embedded in that zero-value hand.  That means it would beat a hand that had a red 10 and a green 10 and a null card.

Sabacc hand rankings are more complicated than poker, but the known poker hands generally are in the same order as Sabacc.  The game comes with a reference chart that seems confusing at first but helps. 

The last bit of the game that adds randomness and frustration and sometimes yelling, is about the dice.  After each of the three rounds, the dealer rolls the dice.  If they come up with the same symbol, then all hands are discarded and the dealer gives each player a number of cards equal to what they were holding.  If this happens in the third round, you are simply stuck for your score with whatever cards you are dealt!