a fixed amount of time. In most regular simuls, the exhibitor plays White in all the games and the individual participants are of varying playing strengths (though they are typically below master class).

In clock simuls all the games are played as normal tournament games and are timed by a chess clock. These simuls require the exhibitor to accept a substantial time handicap since their clock continues to run on all boards. These simuls typically involve a relatively small number of individual participants whose playing strength is at