On average, the kids with higher IQs would have an easier time in the beginning learning the moves and would be selected for further training and grooming; the others would not be offered a spot in the program. The end result would be a collection of chess players with much higher than average IQs. But we know that in the real world there are many grandmasters who don’t score particularly well on IQ tests—so we would have missed the contributions of all of those people who could become great chess players.
