I actually kind of like that shin-on-shin, grab the dude's belt/lapel through the legs and sweep the crap out of him technique. That's good stuff. I almost feel bad sharing this technique which counters it.
So, I'm just going to preface by saying - don't learn this technique. Just let people sweep you with that shin-on-shin business and suck it up. It's for the best.
Jits Mag, once again, comes through with more quality techniques, this time from 3X world champ and 2012 world pro champ, Fernando Vieira (who teaches out of Evolucao Thai MMA in Toronto, CAN). Check out Fernando's simple approach which effectively shuts down an opponent who tries to lock you down with the so-called shin-on-shin guard. Don't stand for that!