What was Olazabal's margin of victory int he Ebel European Masters Swiss Open?
CREATE TABLE "european_tour_wins_23" (
  "date" text,
  "tournament" text,
  "winning_score" text,
  "margin_of_victory" text,
  "runner_s_up" text
);
SELECT "margin_of_victory" FROM "european_tour_wins_23" WHERE "tournament"='ebel european masters swiss open';