Guillotine chokes are a great for finishing opponents if you know how to use them. In this arm in guillotine variation, I show you the details to get a faster tap (tighter finish), block their escape attempts, and even get the finish even if they pass your guard (I don't recommend letting anyone pass your guard though).
This is a versatile choke that can finish your opponent even from a quick snap down (you don't even have to fully lock your guard to get the finish). The main difference with this guillotine choke, is that it chokes both carotid arteries in the neck instead of one (like most shallow guillotines). This makes for a very tight choke. Once your choking hand above their shoulder and lock there arm, it's a very high percentage choke.