Yes, I will ask my instructor. But there are only so many questions I can ask in one class and I'm trying to focus on basic guard passes first. BUT... Sparring last night, one of other other white belts kept standing up in my closed guard and stacked me up and passed a couple of times because I didn't know the counter. I'm pretty sure standing up in closed guard must have some serious counters / sweeps because I never see the higher belts do that and it seems like not a great base. I had some ideas at the time, but as a beginner I don't like to just take wild guesses without at least a basic clue on the proper technique while sparring because I don't want to injure a training partner by trying something stupid. Any suggestions on what are high percentage counter / sweep options from this position?