Good chance I'm doing something incorrectly, but wanted to see what's up.
I'm after filtering for hands in which I was playing on the river against more than one opponent.
I set:
saw river = true
player = hero
This got me hands where I was playing on the river.
Then I used the # of Players and set the # of players on the river between 2 and 10.
However, this gives me no results at all.