David Gerard wrote:
This is a good example of a badly designed anything-for-the-web when it comes to colour blindness - specifically red-green.
I looked at an example of this on a chess talk page (last of the "what links here" display) and could not see anything other than a singly-coloured bar. I looked very close and then realized that it was pale green to the left and pale red to the right - the worst combination for me. After that, my brain could figure it out, since it knew what it was looking at.
This should use more striking shades of red or green for such a narrow bar or a wider bar so that the colour stands out more. A wide, black line between the two parts of the bar to delimit the coloured regions would help too.
Mike