Jeff Meszaros shares an easy wrist lock you can do from the closed guard. You can read some great BJJ training articles written by Jeff Meszaros at this link on my site here: http://www.grapplearts.com/tag/jeff-meszaros/

Waki Gatame is an armlock from Judo, Hapkido and traditional Japanese Ju-jutsu systems, but it can also be used in on the ground BJJ! If you’re interested in starting BJJ and getting it right, right from the beginning, download my free guide here: http://www.grapplearts.com/book