It's a rating out of 100. Almost never get a score of 100 though. As a rule, any horse that scores 70 or more is a big chance and a score of 80 or more usually indicates a special. Those ratings are then converted to odds. I guess you'll have to double that figure to equate with US Tab dividends though. Your divs are based on $2 bets, aren't they?

Geez, race 5 looks damn hard. You're probably lucky that race isn't in your pick 4.