Because they are all amateur engines, and don't have the time/money to go to big tournaments.huybaichay wrote:I know some famous chess engine, for examples: Stockfish, Robolito, Strelka, Fruit, Toga, and some top ranking on Computer Chess Ranking list, but why they don't attend this tournament ?
RobboLito (newest version is IvanHoe) is more of a community project, the Stockfish developers have no interest in attending tournaments, Strelka is a clone of Rybka 1.0 beta, and the Toga/Fruit people are insane.
Peter