 Reviews (Foken, 2006; Hogstrom, 1988; Hogstrom, 1996) report values of "κ" between 0.35 and 0.42.The overall conclusion of over 18 studies is that "κ" is constant, close to 0.40.Bernardo Wexler

Bernardo Wexler (Bucharest, 1 April 1925 – Buenos Aires, 30 June 1988) was an Argentine chess master.