amsterdam anatoly karpov artur yusupov bled boris gulko bugojno chess chess opening dutch chess championship elo rating system emanuel lasker fide fast chess forssa gambit publications garry kasparov gata kamsky gennady kuzmin gothenburg hastings international chess congress helsinki hilversum howard staunton ibm international master interzonal ivan sokolov jan hein donner lajos portisch linares chess tournament loek van wely max euwe mikhail tal netanya netherlands new in chess nigel short oxford university press raymond keene rio de janeiro rotterdam sarajevo sergei tiviakov sombor sweden taxco tilburg valery salov viktor korchnoi viswanathan anand wijk aan zee world chess championship world junior chess championship