"so what ur saying is that although only 0.2% of people have jewish decent morre than o.2% are really goodchess players"
Yes, while one person in 500 is Jewish, I think any list of the 500 greatest chess players would end up with more than 100 Jewish chess players on it.
Most of the time as in most of the time since the World Championship came into existence. Only Alekhine of the players to hold the title for a long time wasn't Jewish, while Lasker, Steinitz, Botvinnik and Kasparov were.