Mamazinho showed me a solid counter to the scarf hold pin--one that is also published in my judo book on pages 110-111. The escape is exactly the same. Here's how "Judo" Gene LeBell describes it:
If your opponent has you in Kesa Gatame ... and you have your arms around his waist, grab his belt. Push his belt away from your body to your upper right. Lift him at the waist. When his hips are off the ground, shove your right knee under his body ... Pull your opponent close to your body at the belt while shifting him from your right to left side by a strong pull downward and to the left with your left hand and push off strongly with your right foot ... Keep on pulling until you are on your stomach and your opponent is on his back ... From this position, you may go into a hold down of your own.
The other escape is one that Angela showed me--though I've seen it at BJJ.org. If the Mamazinho/LeBell version is good for when the guy on top keeps his posture low, then Angela's version is good for when the guy on top keeps his posture high.
Mamazinho and LeBell have you get your hips close to the guy on top. Angela's version has you get some distance by walking your hips away from the pin (away from the top guy's legs). Then turn your hips into him, throwing your far leg over his head--almost as if you were setting up a googoplata. As you straighten your body and extend your leg, you will create space--and probably break his hold insofar as your leg is across his neck (or least his chin) and creating a lot of pressure.
In order to get the guy's head into range for the "leg-over", use your forearm on your far arm to push his head back. If you can grab the far shoulder and bring your forearm across the neck/face, so much the better. Try to turn his head away from you, which will make it easier to you to surprise him with the leg-over.
