A tactic frequently used in blackjack & other card games, card counting can also be very helpful in rummy. You can gain a substantial edge by keeping track of which cards have been played,memory slots on motherboard even though Rummy does not involve betting in the same manner as Blackjack. You can anticipate what your opponents might be holding & make better decisions about your own hand by mentally noting which cards have been discarded and which are still in play. This ability can significantly increase your capacity for effective strategy, but it does require practice and focus.