A players inning continues as long as they legally pocket their called bank. Players can only score one ball per shot; any additional object balls that are pocketed on the same stroke are held for spotting at the end of the shooters inning. A players inning ends when they fail to legally pocket a called or obvious bank, or the cue ball scratches or jumps the table, or the shooter fouls.
Every shot must be pocketed cleanly, without contacting any other object ball on its route to the called pocket.
No combination shots are allowed.
The cue ball must contact the called ball first. No carom shots are allowed.
Every shot must be played ball first. No railfirst shots are allowed.
The cue ball is only permitted to contact the object ball once on its route to the pocket. Any ball pocketed on a double kiss is spotted without further penalty, and the shooters inning is over.
Various house rules permit railfirst shots, as long as they are called, and as long as a bank is designated following the railfirst contact.
Additionally, some house rules and some multiplayer games permit railfirst shots directly into a pocket, as long as the cue ball strikes at least three cushions before the object ball is contacted.