How many players usually plays the card game Micheal Keiner was best known for?
Michael Keiner: Michael Keiner (born February 8, 1959 in Wetzlar, Germany) is a German poker player best known for winning a Seven-card stud WSOP bracelet in 2007. Seven-card stud:  Two to eight players is common, though eight may require special rules for the last cards dealt if no players fold.
Two to eight players