The International Slope Race (ISR) a.k.a. South Bay Soaring Society Pylon Race in 1986.
In the days before F3F racing, a group of UK fliers including David Woods, Jim Hathaway, Mark Passingham, Chris Greengrass and Jim Hammond (Aresti, Minivec, Vector, etc designer) made the trip to San Francisco & San Jose for the Pylon race. No idea who came where in the competition but they had a blast, it seems, flying their Hammond designed Sigma fuselages. My brother David made this slide show and matching music compilation way back when; it's 30 years ago next year! The video quality isn't up to much by today's standards but it's nevertheless a piece of video history documenting an almost lost past.
This video can also be found here: youtube.com/watch?v=T6gmJc8Ii1k