Today's SE - Bollnas Horse Racing Picks

Minus Pool

A pari-mutuel pool – typically a show pool - where one horse is so heavily bet that after deductions there is not enough money left to cover the prescribed minimum on each bet.

Apprentice

A new jockey who has not ridden a certain number of winners in a specified time period.

Across the Board

Refers to betting on a horse to finish first, second, and third to cover any of those scenarios happening during a race