what was the score on the game that happened on May 15?
CREATE TABLE "eastern_conference_semi_finals_vs_4_wash" (
  "date" text,
  "visitor" text,
  "score" text,
  "home" text,
  "record" text
);
SELECT "score" FROM "eastern_conference_semi_finals_vs_4_wash" WHERE "date"='may 15';