CREATE TABLE table_23667 ("Player" TEXT, "Played" FLOAT, "Sets Won" FLOAT, "Sets Lost" FLOAT, "Legs Won" FLOAT, "Legs Lost" FLOAT, "100+" FLOAT, "140+" FLOAT, "180s" FLOAT, "High Checkout" FLOAT, "3-dart Average" TEXT)

What's Trina Gulliver's high checkout?
SELECT "High Checkout" FROM table_23667 WHERE "Player" = 'Trina Gulliver'
SELECT "High Checkout" FROM "table_23667" WHERE "Player" = 'Trina Gulliver'