Sjeng is a strong chess engine by Gian-Carlo Pascutto from Belgium. Sjeng is able to make use of multiple computer processors and is able to play some chess variants, such as Chess960, crazyhouse and giveaway chess.[1] An earlier open source version of Sjeng has been the engine of the standard Mac OS X Chess application since Mac OS X v10.4.[2]
Sjeng won the World Computer Speed Chess Championship in 2008,[3] and the World Computer Chess Championship in 2009.[4] It also won the 12th Internet Computer Chess Tournament in 2010.
The author has also branched into computer Go, selling a strong program named Leela.[5]