DEL MAR, Calif. - What a difference a horse makes. Had Ema Bovary entered Saturday's $150,000 Rancho Bernardo Handicap at Del Mar, the field would have numbered about four, and the favorite would have been odds-on. But since Ema Bovary is passing the Grade 3 race, seven of the remaining eight runners nominated to the race entered, and bettors might have to go more than one horse deep to get through the penultimate leg of the pick six.