The toproll is the best move to beat your less experienced competitors with. If you use a toproll, you are winning with leverage instead of just power. This is because the toproll is what is an "outside" move. You are trying to put alot of pressure on your opponent's fingers, causing his hand to open up and allowing you to gain leverage. When the opponent's hand opens up, it very hard for him to "outmuscle" you until he regains his hand position. You, of course, should fight to maintain and improve your hand position, thereby taking his arm out of the match! If you do it quick enough, you can beat almost anyone!
How The Toproll Is Performed
The nr1 rule to the toproll is to get high on your opponent's hand. The higher you get, the more leverage you gain the easier he is to take down. There are two types of toprolls, one is also called posting toproll, but to make things simple, remember two things. 1) Exert maximum backpressure throughout the entire match when performing the toproll. This way you will get his arm closer to you and he will "loose his arm". This is important. 2) Try to walk your fingers out on your opponent's hand. Once you have succeeded in walking your fingers out some on your opponent's hand, regrip his hand and then begin to walk your fingers out further until you have enough leverage to take him down.
It is all about getting the tourqe power and using the momentum to pin his arm!