First, become acquainted with the subtleties and regulations of the particular variation of rummy you are playing. Gaining a grasp of the game's nuances will give you an advantage over rivals. Also, concentrateroyally rummy on strategically constructing your hand by early in the game discarding high-value cards & using lower-value cards to form sets and sequences. Should your opponent declare the game, this will reduce your points. Also, watch how your opponents play and make an effort to deduce their tactics from the cards they discard and choose. This will enable you to decide with confidence which cards to discard and which to keep.