[SCHEDULE 13G (Amendment No. 1)* Changyou.com Limited (Name of Issuer) Class A ADR Ordinary Shs (Title of Class of Securities) 15911M107 (CUSIP Number) Gary Penning CCO, Psquared Asset Management AG Dufourstrasse 43, Zurich, 8008 Switzerland (Name, Address and Telephone Number of Person Authorized to]