CREATE TABLE table_47427 ("Date" TEXT, "Tournament" TEXT, "Winning score" TEXT, "Margin of victory" TEXT, "Runner ( s ) -up" TEXT)

What is the winning score for the B.C. Open 1 tournament?
SELECT "Winning score" FROM table_47427 WHERE "Tournament" = 'b.c. open 1'
SELECT "Winning score" FROM "table_47427" WHERE "Tournament" = 'b.c. open 1'