CREATE TABLE table_203_773 (id DECIMAL, "season" DECIMAL, "network" TEXT, "play-by-play" TEXT, "color commentator ( s ) " TEXT, "sideline reporter ( s ) " TEXT)

how many seasons of play by play did chris schenkel and chuck thompson host combined ?
SELECT COUNT(*) FROM table_203_773 WHERE "play-by-play" IN ('chris schenkel', 'chuck thompson')
SELECT COUNT(*) FROM "table_203_773" WHERE "play-by-play" IN ('chris schenkel', 'chuck thompson')