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I believe so once mentioned that the reason why whites are so good at Chess is, that it requires a specific type of intelligence which is associated with internally creating deep and wide branched trees of different scenarios or sth. like that.
I don't know exactly if the IQ test measures different types of mental performances or if, like some suggest, there is only one performance factor G and if this one is high all other types are high as well.
Maybe someone can clarify this.
