Chess Informant 90 contains 501 annotated games and 512 variations from games played from February 1st, 2004 through May 31st, 2004 Events covered include: Moscow, Linares, Cappelle la Grande, Reykjavík, Poikovsky, Stepanakert, Monaco (rapid), Sochi, Zalaegerszeg, Bacrot – I. Sokolov (m), Malmö/København, Topola, La Habana, Antalya, Sarajevo, Saint Petersburg, Tomsk, etc. Annotators for this volume include: G. Kasparov, Anand, Kramnik, Lékó, Svidler, Shirov, Bareev, B. Gelfand, Grischuk, Dreev, Rublevsky, Nisipeanu, V. Milov, I. Sokolov, A. Beliavsky, Sutovsky, Vallejo Pons, Malakhov, M. Gurevich, J. Lautier, Sasikiran, Bologan, Motylev, Al. Onischuk, Zvjaginsev, S. Movsesian, Macieja, Iord chescu, Krasenkow, L. Domínguez, P. Tregubov, Bruzón, Ki. Georgiev, Dautov, Je. Piket, Alex. Fedorov, Gyimesi, Kobalia, Berkes, and many others.