alexander alekhine algebraic chess notation anthropophobia antwerp belgium carl schlechter chess olympiad chess endgame chessmetrics emanuel lasker four knights french defence gersz salwe hamburg jeremy silman jew karlovy vary kiev nikolay minev poland rabbi reuben fine rubinstein memorial rubinstein trap stawiski tarrasch defense the oxford companion to chess vienna vilnius warsaw white and black in chess world war i world war ii zugzwang