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Women make up roughly 15% of USCF members yet they only make up roughly 1.5% of grandmasters.
That means they are underrepresented by about an order of magnitude. Women on average are about 200 ELO lower than men. It’s a very large difference and there has been research done to figure out why.
There are no real conclusive findings (as with much of this type of sociological research) but we have evidence for various different reasons. One, women are not encouraged to play chess at the same level that men are. Similar reason that more men go into Computer Science or Physics. It’s not a built in biological difference, but a cultural one.
Another one is that women are younger by 11 years on average, so their ratings haven’t peaked yet. So we should see this gap close in the coming decades. There are also various other inequities between men and women (like for example stereotype threat).
So that explains at least some of the gap. What I’m trying to say is that beyond these factors, there is also a biological difference that results in men being overrepresented in the top chess players. Notice I’m not saying average chess players, but specifically the best in the world (the grandmasters).
Why?
Well, there’s evidence for something called the "greater male variability hypothesis”. Think of every person sitting somewhere on a normal distribution. Pick a trait like aggressiveness or competitiveness.
There are the extremes on both sides of the bell curve. On the left, super passive and on the right super aggressive. Most people clump at the mean, in the center of the bell curve.
There’s evidence that more women cluster around the mean relative to men. Men are overrepresented at the extremes of the bell curve, even though the average is the same as women. Only by a little bit, but it’s statistically significant. That means that if you took a sample of all the super-aggressive and super-passive people, the majority would be men.
When you look at top chess players, they are more likely to have extreme attributes (being ultra-competitive for example helps you get better at chess).
This same effect is also theorized to be why we see that vast majority of prisoners are male. Vast majority of homeless, etc. Because extreme attributes tend to either be really good or really bad.
So that’s one biological difference. The other is the visospatial intelligence. Men tend to score better on visospatial tests when compared to women. This effect is already visible by 2 or 3 months of age, so it’s unlikely to be some sort of cultural effect.
Visiospatial cognitive ability is positively correlated with chess ability. Another biological difference between men and women that likely has some non-zero effect on chess ability.
So why are women underrepresented in grandmasters when compared to males? There is evidence for both
a) external social factors
and
b) innate biological factors
Nobody knows what % of the difference is due to a) or b). We just know there is some non-zero effect for both.
I encourage you to fact check every claim I’ve made. Don’t just look for one research paper that confirms your argument. Each claim I’ve made I’ve seen multiple studies on. There are studies that will say the opposite, but look at it in aggregate. Look at metaanalysis studies.
We’re not talking hobbyists. We’re talking top level athletes. Men aren’t just stronger. There are dozens if not hundreds of items they outperform women on.
The sports where women can actually compete with men are rare. For example marksmanship or long-distance marathon. Virtually every sport men have distinct and significant advantages.
Men have larger hearts, more lung volume per body mass, more red blood cells, more clotting factors which means they recover quicker and have a higher pain tolerance.
Testosterone allows for more rapid muscle gain as well as better recovery. So two people training the same exercises an identical amount of time, the man would have gained significantly more muscle mass and strength.
Men have higher blood pressure, which means they feel fatigue less than women. Men don’t lose iron to menstruation, which means there’s more iron for oxygen circulation in the blood.
These items basically make it so men are much better at almost all sports.
For example soccer. The US Women’s national team lost to a team of high school age boys.
Men can kick harder, sprint faster, run longer, train longer & they gain more from training & they recover faster from training so they can do it more, they feel less pain so they can stay at max exertion longer, they can convert oxygen into energy faster so they can sustain all of this more than women,
Etc
There’s a reason we have women’s leagues. If we didn’t have it, women wouldn’t get to compete at a high level.
At a lower level, like hobbyist or local leagues the story may be different. There’s more variance among the general population than amongst top athletes.
Serena Williams, #1 woman tennis player, can’t hold a candle to the 203rd best man. Look up her interview about it. She’s under no illusions about this