Rummy is a game of skill. You have to keep probability in mind on every turn of yours. For eg. It's great to keep open-ended cards rather than looking out for a single card. Let’s assume you have 9,10 of hearts, and 6,8 spades. Now, when your turn comes, discarding the 8 of spades will be the most beneficial move for you if we see it from the lens of probability. Here’s why: You need a 7 of spades to complete the sequence of 6,7,8. This means there’s only 1 card that can help you out. An 8 of hearts or a jack of hearts will let you complete the sequence of 8,9,10 or 9,10,J. This means there are 2 cards that can help you out. The probability of creating a sequence with 9,10 of hearts is double than the probability of creating a sequence with 6,8 of spades. There are more ways to use probability in the game. You will get to know about them once you start playing.