Thoroughbred Horse Racing and the Weight to be Carried
According to logic, the weight to be carried by an entry should have a demonstrative effect upon the outcome of a race. In fact, the old Jockey Club method of weights and scales, is still used by racetrack handicappers pretty much everywhere, to assign varied weights to the entries in a race; in order to equalize chances of winning and thus level the field of competition.
That said, in practical handicapping terms regarding impost, since the racetrack handicapper has already done the work; other than in two specific cases, it will mostly be inconsequential.
However, handicappers should raise an eye brow any time a horse receives an allowance of 7 to 10 lbs, as usually associated with an apprentice rider; and also whenever european horses racing in their first American race are getting in light at 126.