Blood Guard

Note to self: Make a new toon and name him "Tampon", then earn this title.
Giggity.

Your personal rating change from a win or loss is a direct function of the DIFFERENCE between enemy MMR (eMMR) and your personal rating (CR). I looked at this closely during patch 9.0 and found it to be a simple linear correlation which held true regardless of absolute rating level (data below comes from games with CR 1700-2450). Here are the key conclusions to help predict your CR change -

If eMMR vs CR = -200, then a win changes CR by +6, a loss changes CR by -18
If eMMR vs CR = -100, then a win changes CR by +8, a loss changes CR by -16
If eMMR vs CR = -50, then a win changes CR by +10, a loss changes CR by -13
If eMMR vs CR = +0, then a win changes CR by +12, a loss changes CR by -12
If eMMR vs CR = +50, then a win changes CR by +14, a loss changes CR by -11
If eMMR vs CR = +100, then a win changes CR by +15, a loss changes CR by -8
If eMMR vs CR = +200, then a win changes CR by +18, a loss changes CR by -5

by "battleground rateing" does it mean honor points?