I find that quality hunter judges are pretty accepting of different colors. I show quite a bit at the local and A circuit level and I don't really see biases anymore, at least in my area of the country. In fact, I showed a pretty flashy black and white paint this year and we've won quite a few classes, inclulding undersaddles. In fact, we're reserve champion of our division for a year end award. I've always felt like we were placed pretty fairly. You have to consider what the judges are looking for, something with a long floaty step that can easily make it down a line on a 12 foot stride, rock back on its haunches and bascule over a fence. Lots of breeds that have the louder colors didn't always have the conformation or ability to compete with horses that were bred to have that kind of movement, in the same way that a 17 h TB isn't the "ideal" for a barrel horse. (yes, I know there are 17h TBs that can excel in barrels, but let's be honest, it's usually not typical). That's my take on it anyways. I've read a lot of judges cards and I've never read any negative remarks because of color. (not saying it doesn't happen). All that to say, I think you'd be ok with your horse. :) He's not a very loud roan and from a distance could look like a regular chestnut.