The increment time control was first used in the privately organised 1992 Fischer–Spassky match, and quickly became popular in the wider chess world, and was used in the FIDE World Chess Championship 1998. Nowadays most top level tournaments and tournaments outside the United States use Fischer's system. An increasing number of lower level tournaments in the US are also starting to use Fischer's system. Other aspects of Fischer's patent, such as a synthesized voice announcing how much time the players have, thus eliminating the need for them to keep looking at the clock, have not been adopted.