Gravity Bias in Go

I wonder what would happen if you evaluated a bunch of go games and looked for biases that ignore symmetry. i.e. for a given shape, when it is played on the bottom of the board, the followup percentages are different than when it's played on the side.

There might be more horizontal shimaris than vertical ones, particularly larger ones - they just seem more "stable" that way.

It could look for possible effects of other types of physical thinking in players. The theory is that go thinking might be subtly influenced by other shapes and patterns which come from the real world, and do not treat horizontal and vertical as interchangeable.

Professionals love to claim they don't make mistakes like this - but time after time, actually measuring behavior and outcomes has proved them wrong.