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I have found that prominent breasts make it more difficult for your opponent to hit you. I suppose it's the angle. >>
Sure as hell not going to get myself breasts just to play laser tag
Anyway, keep moving. Most people just sit still in a corner, or presume someone will stand still when spotting an enemy. When you move up to them while shooting you will startle most of them, and gain a few 10th of a second.
Retrace your steps. You quickly walk around in a circle, then almost a circle, shooting everyone in sight, then turn around and shoot em in the back while they presume you will come again from the same direction. (Only works if you can indeed walk a circle)
If you know a good hiding place, presume they know it too. Fire into it without even looking, just presume someone will be hiding there.
Fire over great distances if you see someone and they aren't looking in your direction, you may get a lucky shot. Don't if they look in your direction and your position sux.
Take chances. Most people won't, and will presume others will not either. Step into an open space next to some small corridors with loads of hiding space, and shoot all those aiming at the corridors.
Don't do the marine crap of sticking your gun around a corner first. It usually has censors on the sides too, and it's therefor easy as hell to win from a bunch of marines.
Learn to hit the shoulders. Most assholes cover up the censors on their gun with one hand, while holding the other arm over the censor on their breast, covering one shoulder censor with the other hand. One shoulder censor will remain free at all times that way.
And finally, the supercheat: It doesn't use lasers. Get a programmable remotecontrol, and fire into it with the gun, recording the frequency. The gun only has a small beam, those controls will hit everything within a certain radius
Edit: Oh, and if you are tall: many places have not too high walls, just lift your gun and sweep down