What is the Opponent when the location was groves stadium • winston-salem, nc, with a result of t 17-17?
CREATE TABLE "schedule" (
  "date" text,
  "opponent" text,
  "location" text,
  "result" text,
  "attendance" real
);
SELECT "opponent" FROM "schedule" WHERE "location"='groves stadium • winston-salem, nc' AND "result"='t 17-17';