CREATE TABLE table_78102 ("Rd #" FLOAT, "Pick #" FLOAT, "Player" TEXT, "Team  ( League ) " TEXT, "Reg GP" FLOAT, "Pl GP" FLOAT)

What's the highest Pl GP with a Reg GP over 18?
SELECT MAX("Pl GP") FROM table_78102 WHERE "Reg GP" > '18'
SELECT MAX("Pl GP") FROM "table_78102" WHERE "Reg GP" > '18'