0.2% of the world population being Jewish it is interesting that not only the World Champion has been Jewish most of the time, but also that many of the strongest players not to win the title have been at least partly Jewish, like Rubinstein, Tarrasch, Zukertort, Bronstein, Reshevsky, Najdorf, Nimzowitsch, Spielmann, Fine, Korchnoi, Gelfand, Aronian, etc.
Why most of the great chess players are jews?

so what ur saying is that although only 0.2% of people have jewish decent morre than o.2% are really goodchess players
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.
"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.

Chess is a heliolithic game and the Jewish culture is heliolithic thus chess appeals to people who were brought up in the Jewish culture.
What the hell does chess--or Judaism--have to do with the sun and rocks?

@bigpoison, a clever way for you to remind us that Einstein and a slew of other important physicists were also Jewish.

Do not forget that after israel, the biggest population is in the US now. 2 percent or close to 6 mio people.
Before ww2 it were poland and russia where most jews lived. But 6 mio were killed by the nazis or 1 in 3 in the world.

Nah, six million noncombatants, including gypsies, homosexuals, etc. Somewhere between 3-4 million jews.

Possibly. I just visited the holocaust museum in jeruzalem and they clearly speak about 6 mio killed. The figures come from http://www.jewishvirtuallibrary.org/jsource/Judaism/jewpop.html

Nah, six million noncombatants, including gypsies, homosexuals, etc. Somewhere between 3-4 million jews.
That's the thing. The Holocaust is undoubtedly the darkest moment in Jewish history, but it wasn't only Jewish history but others such as disabled, gay, Gypsie, communist, and others were killed too.
Hitler accused the Jews of taking and contributing nothing back to Germany, but this was simply a lie as Jewish pragmatism is largely responsible for the great advancements of the 20th century, scientifically, technologically, and socially (the Jews were very active in the Civil Rights movement).

Nah, six million noncombatants, including gypsies, homosexuals, etc. Somewhere between 3-4 million jews.
You're wrong. 11 million noncombatants, 6 million Jews.
Source: http://www.nps.gov/wwii/historyculture/the-holocaust.htm. Read the first paragraph.
Well, i find this an interesting question. My answer is that there are a number of factors that contribute, but my answer is not scientifically supported :
1) jews were discriminated by all other religions and were never allowed to own property in europe or become members of a guild like butchers or leatherworkers. Christianity did not allow lending and neither did islam, so jews were the natural community to take up this activity, which became over time the biggest success in history. So they were office workers and naturally inclined to play games that the average butcher did not play.
2) they are studious and are called : the people of the books. They like to develop thinking systems and play with them. Like the kabalah.. Chess is such a system.
3) they are a tight community and chess is very much a community game
4) they are highly competitive and like intellectual challenges
5) they are smart and people like einstein are proof of this.