/sci/ - Science & Math

I have a stupid question about the forces involved in arm-wrestling.
Specifically, I tried arm-wrestling with a girl who was allowed to use two arms, one on the table in the normal manner, and the other one just freely pushing on the point where our hands were locked, like in pic related.
I'm curious how big of an advantage this is. I was able to beat her, but it was extremely difficult. It seems like pushing directly at the outer rotation point instead of having to produce torque from the elbow on the table, essentially, would be a huge leverage advantage.
But I don't even know enough elementary physics to figure out the kinds of force amplification involved.