Fast chess
Fast chess is similar to a normal game of chess, but played at a faster than usual rate. The player who runs out of time first (or is checkmated, whichever happens first) loses the match.
Fast chess versions, always played with a chess clock:
Fast Chess Media
Magnus Carlsen (left) playing GM Dennis Wagner (right) at the 2015 FIDE World Chess Rapid and Blitz Championship in Berlin, at which Carlsen retained the title World Rapid Chess Champion
Blitz World Champion Alexander Grischuk (right) in Berlin, 2015, with runners-up Vladimir Kramnik (center) and Maxime Vachier-Lagrave (left)