The Capoeira Pass is a very effective way of dealing with the problem of passing a persons Half Guard. Click here to see a video of one version of the Capoeira Guard Pass.
Instead of passing the guard you could also transition to a lower body control position and end the fight in a No-Gi Grappling, Sambo or MMA bout with a leg knot.
As you backstep for the pass you lock up an Inside Leg Triangle to secure the position while you lace up the legs for the knot. Once the leg are laced then you open the leg triangle and tie the knot by stepping your outside leg over your opponent's ankle.
You can also set this up from standing against the seated guard.
