I'm a pretty small guy 5'6" and 125 pounds, so I'm ALWAYS smaller than my opponent. One of my best friends that I grapple with is 6'4" and 155 pounds, so he's pretty skinny but he has tons of height. Whenever we first started grappling we would both always go for chokes, then I started pulling guard and going for armbars, triangles, and kimura's. However he caught on after I won a few quick tapouts. One of my main weaknesses in grappling with him is I HAVE to be on the ground. If we stand up, my head is right at his armpit and he just guillotines me every time and pulls me straight off the ground so all my weight in choking me. I'm looking for a good technique to escape that standing guillotine. Also, when we're grappling and I have open guard with him standing and he starts to lean in and I close my guard, he usually just stands up, and his hips pull me off the ground, so unless I want to get slammed, I have to let go, and he usually keep doing this until he can circle around enough times and he gets side control. Any way to combat this? Any other tips or techniques would be much appreciated too. I'd grapple with others, but all my other friends/training partners weigh at least 170+, granted they are shorter but they have a much more significant weight advantage on me.