Choosing a Monitoring Card. Keeping track of the cards that each player selects to discard & the ones they take from the discard pile is a useful strs23 ultra sim slotsategy. You can use this information to determine which sets or runs they might be aiming for & modify your own approach accordingly. recognizing trends and actions. An opponent might be attempting to finish a run in hearts, for example, if they routinely pick up hearts while throwing away spades.