Rybka is a computer chess engine by International Master Vasik Rajlich. As of February 2007, Rybka is top-rated in the CCRL, CEGT, SSDF, SCCT, and CSS rating lists.http://computerchess.org.uk/ccrl/4040/index.html compurtechess.org.uk, http://web.telia.com/~u85924109/ssdf/list.htm Telia, http://www.husvankempen.de/nunn/ Husvankempen, http://www.geocities.com/sedatchess/SCCT_Auto232.html Sedatchess, http://www.computerschach.de/cssrangliste/englisch/erangliste.htm computerschach.de. As of June 10, 2006, Rybka fully supports both single processor and SMP systems.