You'll want to write this one down.
OK, you're in your opponents guard, and he starts popping off triangle/arm bars left and right. Eventually you get caught and tap out.
Well, let's think about what the first thing that has to happen for your opponent to attempt his triangle or armbar.
The hips have to move.
Yeah, it's that simple. Stop his hip motion, and there's no triangle or arm bar coming.
How do you do that?
You''re in his gaurd. Stay close to him, with your elbows/forearms on the mat, knees touching and extending past his buttocks, and make sure your elbows are touching your knees, effectievely trapping his hips.
Keep your knees and elbows touching, or he'll be able to shrimp his hips out. He's going to scoot and try like crazy to free his hips and create space, but you need to stick to him like stink on sh@t.
Try it out, it works.