Lightning or bullet: quick chess. Officially,
shorter than "3 0" time controls, i.e. 0 1, 0 2, 0 3, 0 4, 1 0, 1 1, 1 2, 2 1
(time controls are in minutes start - seconds increment). Played often on
Internet Chess Servers such as FICS or ICC rather than OTB, for
practical purposes.
View information online at: http://www.checkmate.de/.