To stop your opponents from creating sets & sequences, however, you might want to discard a card if you see that it is being picked up a lot. In general, one of the most imbingo and slotsportant rummy skills is knowing when to discard and when to hold onto cards. This calls for quick thinking and strategic decision-making. Making sets and sequences in Rummy is essential to winning. A set is a collection of three or four cards of the same rank, whereas a sequence is a group of three or more consecutive cards of the same suit.