CREATE TABLE table_247955_2 (margin_of_victory VARCHAR, runner_s__up VARCHAR)

What was the margin of victory when runner-up was K. J. Choi?
SELECT margin_of_victory FROM table_247955_2 WHERE runner_s__up = "K. J. Choi"
SELECT "margin_of_victory" FROM "table_247955_2" WHERE "K. J. Choi" = "runner_s__up"