A tandem simultaneous exhibition or leapfrog simultaneous exhibition or partnership chess is a form of simultaneous exhibition in which more than one players (typically of high rank, such as a grandmaster or dan-level player) play multiple games at a time with a number of other players, making successive moves without consulting one another. Such an exhibition is often referred to simply as a "tandem simul" or "leapfrog simul". When conducted by more than two experts, it is often called a sequential simul.