I have been taught to keep the toes of the rear foot facing forewards in the same direction as my front foot. To prove the strength advantage of this my coach will get me to assume both stances and push me from the front. I do believe it allows you to 'push' back more effectively especially when you are under pressure and perhaps at a strength disadvantage.
However I was watching a pro boxing fight last night - Solis vs Ortega where it was stopped in the eighth round - and I noticed both fighters had their rear foot facing waaaay out - at a right angle to the direction their left foot was facing.
Ortega (not sure of the spelling sorry) was beaten obviously and did not fight aggressively while moving backwards possibly because of this. Still I think there must be a reason some fighters competing at a high level fight this way. What would be the advantage? Would they have a large range of hip rotation to get power into their attack perhaps?
Maybe someone out there could enlighten me on the up side of facing the rear foot out? Would it be possible to choose which way you stood with your rear foot to best suit your situation perhaps?