Fights between athletes of big disparity in height and weight have a way of catching the attention of the audience in open divisions of BJJ tourneys. One of these can be found in the following video.
In a purple-belt gi absolute, the small athlete seen in white took on a hulk of an opponent. In order to overcome him, the fighter in white had to resort to excellent technique. After attacking via single-leg, he transitioned to the side, sought the back, mounted, and strangled with the use of the lapel, to the delight of those in attendance.
Watch and be fearless.